Two Way Slab Design Example Pdf



2 of the AASHTO LRFD Bridge Design Specification. Rectangular Beams and One-way Slabs Page 3 of 9 Design of Rectangular Beams and One-way Slabs (Continued) a = β1 c Where β1 = 0. 2: Behavior of Two way slab. Matthew Stuart, P. While there is a dearth of published research available describing the behavior of two-way slabs with bonded tendons, the author has received. 27 Design Example 1 (Typical House with 2 Rooms and Verandah). Two way slabs are the slabs that are supported on four sides and the ratio of longer span (l) to shorter span (b) is less than 2. This method has been used extensively since 1963 for slabs supported at the. It was actually the widespread use of the "post-tensioned" slab-on-ground which induced this interest in design procedure and in many studies of reported slab failures. Beams, see Lecture 3 • Punching shear requirements e. Shorter direction steel will be placed near the outer edge to get more “d” means more lever arm to get more flexural capacity. 1 Introduction A slab is structural element whose thickness is small compared to its own length and width. "direct design method" of the present code, has led many engineers to continue to use the design method of the 1963 ACI Code for the special case of two-way slabs supported on four sides of each slab panel by relatively deep, stiff, edge beams. Fanella, which appeared in the October 2001 edition of Structural Engineer magazine. #2 Two Way Slab: Two way slab is a slab supported by beams on all the four sides and the loads are carried by the supports along both directions, it is known as two way slab. Limit analysis provides a powerful tool for treating such problems. Brown' (pdf) About The Author. The example presented here is for Two-Way Post-Tensioned Design. The situations in which the reinforced concrete slabs require the intervention for repairs or strengthening are the following [1]: a) Repairing damaged/deteriorated concrete slabs to restore their strength and stiffness. Herein the introduction to direct design method. The concrete floor slab system shown below is for an intermediate floor to be designed considering partition weight = 20 psf, and unfactored live load = 40 psf. Slabs can be designed by Direct Design Method known as DDM and another method for design is Coefficient Method which is the easier one. Detailing and design of earthquake resistant buildings made of reinforced concrete. 27 Design Example 1 (Typical House with 2 Rooms and Verandah). What to expect from this course: After completion of this course, you are expected to be able to design the two types of RC Beams: Joist Slab System, and Solid Slab System. Material: C30. Tunnel designs are very specific designs that we may design once or two three times in our life. flat slabs. submitted to the faculty of the SCHOOL OF MINES AND M ETALLURGY OF THE UNIVERSITY OF MISSOURI in partial fulfillment of the work required fo r t h e Degree of MASTER OF SCIENCE IN CIVIL E N G I N E E R I N G Rolla, Missouri Approved by. Similar searches: Bs 8110 Concrete Design For Slab How To Pour A Concrete Slab Concrete Beam And Slab Bridge How To Pour A 26x36 Concrwte Concrete Slab Design Of Two Way Slab Example Pdf Flat Slab Design Pdf Design Of Steel-to-concrete Joints - Design Manual Design Concrete Concrete Design Mix Concrete Design Design Of Concrete Structures Pdf. 8 CHAPTER 8: DESIGN OF ONE-WAY SLABS 8. Page 6 provided at 100 mm below ground level. A reinforced concrete slab is a broad, flat plate, usually horizontal, with top and bottom surfaces parallel or nearly so. Neglect compression reinforcement. Design of one way slab (USD) One-way slabs are those slabs having supports along one way only (Figure 1(a)) or slabs having supports having on all sides but with an aspect ratio in plan of 2:1 or greater, in which bending is primarily about the long axis (Figure 2(a)). The numbering of the members is explained as below. input cells automatically cross out invalid data 3. 5, the deflection specifications for two-way slabs. This paper deals with the problem of optimum design of reinforced concrete (two­way ribbed) waffle slabs using genetic algorithms. nice user-friendly interface 2. OF TWO-WAY SLABS BY GERALD C. , including the ½ inch integral wearing surface, is assumed. Design Step 4 - Design of Deck Prestressed Concrete Bridge Design Example Task Order DTFH61-02-T-63032 4-3 For this example, a slab thickness of 8 in. There are two types of slab classification based on the direction of bending occurs in these slabs. INTRODUCTION In reinforced concrete construction, slabs are used to provide flat, useful surfaces. The following example illustrates the design methods presented in ACI 318-05 and IBC 2003. Required reinforcement is displayed in a very. 8 CHAPTER 8: DESIGN OF ONE-WAY SLABS 8. Step 2 Design forces Draw panel of slab and indicate maximum design moments, shears and in-. Previously known as Method 3 of the 1963 ACI Code. Determination of bending moment and shear force. The integral wearing surface is considered in the weight calculations. pdf from CIVIL ENG. In two way slab, the ratio of longer span (l. The coefficient method may be the simplest, easiest and the quickest approach for the design of two-way slab supported by edge beam on all slab sides. For lower loads they can have constant. 3 Example 2 - Rectangular Two-Way Slab Designed to AS 3600-2000 Using 500PLUS design Slabs, Slabs,. b) Corrosion of the reinforcement. The service live load is 100 psf, and 4000 psi concrete is specified for use with steel with a yield stress equal to 60,000 psi. Essential spreadsheet for two way slab design. Slabs can be designed by Direct Design Method known as DDM and another method for design is Coefficient Method which is the easier one. As the support geometry. 2 m) each direction Resists lateral loads by frame action Can have capitals, drop panels, beams & joist Efficient, least depth & material use 1 8 - 3 0 f t Flat Plates (Two‐Way) Two‐way Slabs 39 40. pdf), Text File (. INTRODUCTION In reinforced concrete construction, slabs are used to provide flat, useful surfaces. Reinforcement implementation, static and dynamic analysis For reasons regarding behaviour, safety and economical design, the two-way slab is far more efficient than the equivalent one-way slab. Slabs having supports on less than four sides can be designed as one-way. The finite element method is commonly used to design the reinforcement in concrete slabs. Chapter 18 - Concrete Slab Structures January 2019 18-8 18. 3—Crack control in reinforced two-way action structural slabs and plates. Interior Bay Dimensions 20' 24'. A reinforced concrete slab is built integrally with its supports and consists of two equal spans, each with a clear span of 15 ft. 7 12 A Tributary u ft2 V q 0. The slab is supported on beams of size 225 x 500 mm spaced at 4. 10—Bonded reinforcement in post-tensioned slabs. Example: Generally all the Cantilever slabs are one Way slab. I have developed a Microssoft Excel Software for Design of a Two Way RCC Slab. shown on pages 42 and 43 of our Design Manual and Catalog of Steel Deck Products. CE 433, Fall 2006 Slab Design Example 1 / 6 Design a one-way slab for an exterior bay of a multi-story office building using the information specified below. Design Of Reinforced Concrete Structures ii Two-Way Slabs 1 1. , and unfactored live load = 100 psf. While the example is related to a specific system type (two-way slab) the workflow applies to input of one-way slabs and beams. c) Limiting crack width under increased (design/service) loads or sus-tained loads. 9—Post-tensioned slabs. This course 'Design of Reinforced Concrete Slab' gives you detailed understanding, explanations and procedures for the design of RC Slabs. In two way slab, the ratio of longer span (l) to shorter span (b) is less than 2. The procedure of the design of two-way slabs will have all the six steps mentioned in sec. However main reinforcement bar and distribution bar. Design of one way slab (USD) One-way slabs are those slabs having supports along one way only (Figure 1(a)) or slabs having supports having on all sides but with an aspect ratio in plan of 2:1 or greater, in which bending is primarily about the long axis (Figure 2(a)). According to the way loads are transferred to supporting beams and columns, slabs are classified into two types; one-way and two-way. ANALYSIS AND DESIGN OF TWO-WAY SLABS 3. PT Designer is a computer program for the design and analysis of linear post-tensioned concrete floor systems. PARTITIONING A TWO-WAY SLAB Size of the Model Edge Restraint Springs • •. pdf from CIVIL ENG. The slab spans in both the orthogonal directions. Storey number Storey numbers are given to the portion of the building between two successive grids of beams. continuous beam, and a two-way slab. One-way slabs (for m=l l /l s >2) b. The direct design method is an approximate method used to analyze two way slabs. 25 Kn/m Floor finish = 2 Kn/m Filling load = 3. and slab live load: 2. Part Three we will now continue with the study of two-way, post-tensioned slab systems, including a complete design example using the Equivalent Frame concept. The edge column on the left has a section of 16" x 16" and carries dead & live load of 175 kips & 110 kips respectively. Tests on three model slabs incorporating minimum reinforcement ratio, minimum depth and maximum bar spacing permitted by the Australian Concrete Structures Code showed satisfactory behaviour at service loads and ultimate loads despite the fact that bending. Assume partitions cannot be damaged by deflections. They may be supported on two opposite sides only [Fig. One way concrete slab bends or deflects in a direction perpendicular to the supporting. The slab spans in both the orthogonal directions. Accordingly, main reinforcement is required in the two directions. Check List for Block / Brick work. 85 f c’ x a x b = A s x fy ⇒ a = (A s x fy)/( 0. In addition to the recommended procedures, other methods are described for the sake of completeness and to compare different methods of design. The following example illustrates the design methods presented in the PCA book "Simplified Design-Reinforced Concrete Buildings of Moderate Size and Height" third edition. The values of G are given in Table 1. ; A Middle strip is a design strip bounded by two column. Application of the yield line theory for more complex situations 8. Static Equilibrium of Two-Way Slabs Total Moment in both beams Full load was transferred east-west by the planks and then was transferred north-south by the beams; The same is true for a two-way slab or any other floor system. Cross-sectional areas of the floor beams and girders are 14. Its made of concrete. Rooms (two way slabs) are continuous with verandah (one way slab). Analysis and Design of Slabs. EC2 Webinar - Autumn 2017 Lecture 5/2 Designing for shear in slabs • When shear reinforcement is not required -e. Example Load Distribution Problem 7 The floor system of a library consists of a 6-in thick rein-forced concrete slab resting on four floor steel beams, which in turn are supported by two steel girders. Reinforced concrete structures II - Two way slab Example Reinforced concrete structures II Page 1 Example 3. A tendon may contain one or more seven-wire strands. input cells automatically cross out invalid data 3. β1 cannot be less than 0. Basic Steps in Two-way Slab Design Choose layout and type of slab. The behavior of the software has not changed for these examples. RCC Dog-legged Staircase design Excel Sheet. Chapter 3: Analysis and Design of Two-way Slabs Page 1 CHAPTER 3. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. Fanella, which appeared in the October 2001 edition of Structural Engineer magazine. Its scope includes proposing the inclusion of two new equations: to compute effective moment of inertia by Bischoff (2005) and Bischoff and Scanlon (2007) and to calculate minimum thickness required for a two-way slab by Scanlon and Choi (1999) respectively. The two classifications are one-way slab and two-way slab. The first Reinforced Concrete Design Manual (formerly titled ACI Design Handbook) was developed in accordance with the design provisions of 1963 ACI 318 Building Code by ACI Committee 340, Design. continuous beam, and a two-way slab. 25L 2, whichever is less. Design Of Reinforced Concrete Structures ii Two-Way Slabs Notes: For each value of moment, can be calculated, then. In two-way slabs shorter direction strip carry greater %age of load. Main features of the spreadsheet 1. determine the preliminary slab thickness h documents similar to post_tensioned_sample. Two way RCC slab designing tool in Microsoft excel developed by Shankar Tayal a 3rd year student of school of infrastructure, Indian Institute of Technology, Bhubaneswar. Two‐Way Slabs Two‐way framing action Spans typically up to 40 ft (12. Types of Slabs: 1. 3 STEP-BY-STEP DESIGN PROCEDURE FOR SLABS Step 1 Analysis Carry out analysis (follow Section 3. Next Review on 'Calculations for Machine Design by Thomas H. There are many methods that are used to analyze two-way slabs and the precision of these methods vary depending. 6 Design of Two-way Slabs. Two-Way Flat Plate Concrete Floor System Analysis and Design. , including the ½ inch integral wearing surface, is assumed. 4 Summary of a Design Example with Soft Soil detailing to provide enhanced local two-way action, providing increased flexural. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near mid-span. The one-way slabs are presented in Section 9. Assume partitions cannot be damaged by deflections. 1 allows other methods if they meet certain requirements. Notes on One Way Slab Design -Dr. This method has been used extensively since 1963 for slabs supported at the. Thickness of slab. usually slabs • When shear reinforcement isrequired e. Two‐Way Slabs Two‐way framing action Spans typically up to 40 ft (12. 1 Design and Rating Requirements All new concrete slab structures are to meet design requirements as stated in 17. by EF Date 20/08/2014 Chk'd by EF Date App'd by Date RC SLAB DESIGN (BS8110:PART1:1997) TEDDS calculation version 1. However main reinforcement bar and distribution bar. Section 11. 03 TWO WAY SPANNING SLAB DEFINITION - RESTRAINED; Overall depth of slab; h = 250 mm Outer sagging steel. automatic generation of a step by step design calculation. L 1 and L 1 are the span lengths in the two slab directions. This section will explain how the direct design method is used. Similar searches: Bs 8110 Concrete Design For Slab How To Pour A Concrete Slab Concrete Beam And Slab Bridge How To Pour A 26x36 Concrwte Concrete Slab Design Of Two Way Slab Example Pdf Flat Slab Design Pdf Design Of Steel-to-concrete Joints - Design Manual Design Concrete Concrete Design Mix Concrete Design Design Of Concrete Structures Pdf. 3 STEP-BY-STEP DESIGN PROCEDURE FOR SLABS Step 1 Analysis Carry out analysis (follow Section 3. There are two types of slab classification based on the direction of bending occurs in these slabs. Two-way Slabs Prestressing Tendons (CGS) At top = 48 mm At bottom = 48 mm Nonprestressing reinforcement (cover) At top = 25 mm At bottom = 25 mm 143 DESIGN CRITERIA 143. The slab thickness is to be designed as 150 mm. The first Reinforced Concrete Design Manual (formerly titled ACI Design Handbook) was developed in accordance with the design provisions of 1963 ACI 318 Building Code by ACI Committee 340, Design. Plan View of Floor System Assume partitions will not be damaged by deflections. 25 MPa fy = 300 MPa Analysis and Design of Slabs Two Way. Design Of Two Way Slab Example Pdf. Basic Steps in Two-way Slab Design Choose layout and type of slab. Please read the lauses mentioned in the video while solving the problem. txt) or read online for free. INTRODUCTION In reinforced concrete construction, slabs are used to provide flat, useful surfaces. 3 F is the total design ultimate load on the strip of slab between adjacent columns considered (1. In two way slabs, load will be carried in both the directions. Chajjas and verandahs are an practical example of one way slab. for other hand the length to breadth ratio is then two the slab is designed as two way slab (ly/lx <2 ). 3 review question. Step 2 Design forces Draw panel of slab and indicate maximum design moments, shears and in-. Therefore slab is two way. So, for the first try use wire mesh that is the closest to 0. Equilibrium frame method. tool for the analysis and design of concrete slabs. These slabs are constructed to provide flat surfaces, usually horizontal, in building floors, roofs or other types of structures. Thickness of slab. the Faculty of the Graduate School 3. There are two types of slab classification based on the direction of bending occurs in these slabs. Accordingly, main reinforcement is required in the two directions. L 1 and L 1 are the span lengths in the two slab directions. The slab spans in both […]. 0uu u u A Tributary kips do O. Flexural Deflection in ACI 318-02 Controlled in Section 9. • The design bending moment of two-way restrained slab can be calculated as follows; Moment at short. 8 CHAPTER 8: DESIGN OF ONE-WAY SLABS 8. The design forces account for twisting moment in slab, so their values are more meaningful for design. Determination of bending moment and shear force. Two‐Way Slabs Two‐way framing action Spans typically up to 40 ft (12. The slabs are presented in two groups: one-way slabs and two-way slabs. shown on pages 42 and 43 of our Design Manual and Catalog of Steel Deck Products. To see their result for this slab we will find the load factor, λ, to cause failure. Fanella, which appeared in the October 2001 edition of Structural Engineer magazine. 9—Post-tensioned slabs. BRIDGE APPROACH SLAB ANALYSIS AND DESIGN INCORPORATING ELASTIC SOIL SUPPORT _____ A Thesis presented to. Two way slabs are the slabs that are supported on four sides and the ratio of longer span (l) to shorter span (b) is less than 2. , interior beam dimensions = 14 in. Two-way Slabs Prestressing Tendons (CGS) At top = 48 mm At bottom = 48 mm Nonprestressing reinforcement (cover) At top = 25 mm At bottom = 25 mm 143 DESIGN CRITERIA 143. Net, which many engineers have come to trust over the years for its accuracy and flexibility. Determination of Two way slab thickness:  Case 1 : interior and edge beams are exist. tool for the analysis and design of concrete slabs. Dutta , IIT Bhubaneswar. 3 presents two parallel methods for calculating moments in two-way slab systems. Two‐Way Slabs Two‐way framing action Spans typically up to 40 ft (12. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types; one-way and two-way. 5 Kn/m Wall load = 2 Kn/m Live load = 2 Kn/m Total U. The situations in which the reinforced concrete slabs require the intervention for repairs or strengthening are the following [1]: a) Repairing damaged/deteriorated concrete slabs to restore their strength and stiffness. 8—Slab shear reinforcement. Slab Reinforcement. Distribute moments transverse at critical sections to column and middle-strip and if. usually one and two-way spanning slabs • Punching shear –e. 30 min) 24 dia. Title Reinforced Concrete Slab Design Using The Empirical Method Publication No. • The design bending moment of two-way restrained slab can be calculated as follows; Moment at short. Please read the lauses mentioned in the video while solving the problem. Brown' (pdf) About The Author. txt) or view presentation slides online. The design of waffle slabs is the same as that of ribbed slabs, with the difference being that waffle slabs have ribs spanning in both directions, and the coefficients used for analysing the slab is similar to those used for two-way restrained slab. 13 and the Elastic Frame Method presented in this chapter. Given: 20' 20 a I 0 c b w = 1. There are two types of slab classification based on the direction of bending occurs in these slabs. 75 Kn/m Bending Moment B. The following example illustrates the design methods presented in the PCA book "Simplified Design-Reinforced Concrete Buildings of Moderate Size and Height" third edition. Inroduction When the ratio (L/S) is less than 2. Design Of Reinforced Concrete Structures ii Two-Way Slabs Notes: For each value of moment, can be calculated, then. Concrete Slabs Design Example - Free download as PDF File (. Unless otherwise noted, all referenced table, figure, and equation. Sample Design Calculations. 1 Introduction A slab is structural element whose thickness is small compared to its own length and width. PARTITIONING A TWO-WAY SLAB Size of the Model Edge Restraint Springs • •. usually one and two-way spanning slabs • Punching shear -e. • When zd is determined, the prestressing force required to balance an. The following example illustrates the design methods presented in the PCA book "Simplified Design-Reinforced Concrete Buildings of Moderate Size and Height" third edition. This types of slabs are mostly used in the floor of. Professor Emeritus. Storey number Storey numbers are given to the portion of the building between two successive grids of beams. for two - way slab along the longer span shall be placed below 1. Civil Engineering Design (1) 11 Dr. Constitution D J LeeCBE BScTech DIC FEng FIStructE FICE Chairman, (until April 1995) (previously G Maunsell & Partners) R S Narayanan BE(Hons) MSc DIC FEng FIStructE Chairman, (from May 1995) (S B Tietz & Partners) ProfessorAWBeebyBSc(Eng) PhD CEng MIStructE MICE (University of Leeds) PG CobbCEng MICE (Sir Robert McAlpine & Sons Ltd). 2: Behavior of Two way slab. When a rectangular slab is supported on all the sides and the length-to-breadth ratio is less than two, it is considered to be a two-way slab. Economic Concrete Frame Elements to Eurocode 2 Pictorial index ii Symbols iv 1 Introduction 1 2 Using the charts and data 2 3 In-situ concrete construction 24 3. 10m (min) compacted 24 dia. , and unfactored live load = 100 psf. SHEAR DESIGN IN FLAT PLATES AND FLAT SLABS When two-way slabs are supported directly by columns, as in flat slabs and flat plates, or when slabs carry concentrated loads, as in footings, shear near the columns is of critical importance. I have developed a Microssoft Excel Software for Design of a Two Way RCC Slab. 3 Limit States Design Method 18. The program is developed around the robust computational core of two popular programs – PTData. The direct design method. The integral wearing surface is considered in the weight calculations. Accordingly, main reinforcement is required in the two directions. 1 Worked example A simply supported beam has an effective span of 9 m and supports loads as shown. SHEAR DESIGN IN FLAT PLATES AND FLAT SLABS When two-way slabs are supported directly by columns, as in flat slabs and flat plates, or when slabs carry concentrated loads, as in footings, shear near the columns is of critical importance. Guideline design for concrete slab. 1 Design and Rating Requirements All new concrete slab structures are to meet design requirements as stated in 17. 3 presents two parallel methods for calculating moments in two-way slab systems. 2 Example 1: Ultimate Behavior of One-Way Spanning Slab Linear Elastic Analysis Methods such as moment distribution are linear elastic methods. CHAPTER 6—SERVICEABILITY CONSIDERATION. Determine suitable dimensions for the effective depth and width of the beam. Accurately determining the moments on a two-way slab is typically accomplished by finite element computer analysis. pdf from CIVIL ENG. 7 Two-Way (Waffle) Flat Slab Design plications will be illustrated in the design examples following. This is a part of his project 'Economic design of two way RCC slabs' under Prof S. Allowable stress design or working stress design (WSD) 2. Rooms (two way slabs) are continuous with verandah (one way slab). 2 m) each direction Resists lateral loads by frame action Can have capitals, drop panels, beams & joist Efficient, least depth & material use 1 8 - 3 0 f t Flat Plates (Two‐Way) Two‐way Slabs 39 40. for other hand the length to breadth ratio is then two the slab is designed as two way slab (ly/lx <2 ). In two way slabs, load will be carried in both the directions. Additional slab dead load (the value excluding the self-weight of slab in a full load analysis for the slab): 1. Direct Design Method alias DDM as well as Coefficient Method are used to design the slabs. This course 'Design of Reinforced Concrete Slab' gives you detailed understanding, explanations and procedures for the design of RC Slabs. Download: BS 8110 CONCRETE DESIGN FOR SLAB. and deflects in the form of dish or a saucer is called two way slabs. Accordingly, main reinforcement is required in the two directions. Notes on One Way Slab Design -Dr. Since 1971, all two-way reinforced systems, with or without beams, have been subject to the same integrated analysis and design procedures (Chapter 13). Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. Both vertical and horizontal loads may be transferred from one member to another properly (if the beams and slabs are designed succesfully). Bending will take place in the two directions in a dish-like form. CHAPTER 7—DESIGN OF SLAB-COLUMN FRAMES UNDER LATERAL. one way slab has structural strength in the shortest direction; Deflected shape of the one-way slab is cylindrical. BASIC STEPS OF TWO WAY SLAB DESIGN : 1. , and unfactored live load = 100 psf. This can be used in conjunction with a structural analysis program such as our Slab Analysis Tool. The unit weight of reinforced concrete is assumed to be 24 kN/m3. The basic design procedure of a two-way slab system has five steps. The Coefficient Method is a method of designing two-way slabs that are supported by edge beams. nice user-friendly interface 2. One-way slabs:. Loads: Framing Dead Load = selfweight Superrimposed Dead Load = 25 psf partitions, M/E, misc. The recommendations derived from these and other studies vary from extremely light to extremely heavy. pdf), Text File (. The interior column has a section of 20" x 20" & carries dead & live load of 220 kips & 120 kips respectively. CHECKS ON SLABS. 375 kn-m Ultimate Moment Mu = 1. Part Three now continues with the study of two-way, post-tensioned slab systems, including a complete design example using the Equivalent Frame concept. Determination of bending moment and shear force. A simple, practical and economical design method for two-way reinforced concrete slabs, based on Hillerborg's Strip Method, is presented. The two-way slab on beams, analyzed as separate elements, appeared overdesigned with unnecessarily high safety factors. Modeling the building and obtaining the modal properties (mode shapes and fundamental. Design the two way slab beam supported floor system if it is intended to be used for office building ,assume the partition wall load to be 2 ⁄ I2 Use C25/30 S400 Cover 25 mm Solution. Accordingly, main reinforcement is required in the two directions. Chapters 1. For additional information, refer to the ADAPT-PT/RC 2018 Getting Started Tutorial for RC mode and the ADAPT-. Notes Author Staff - BridgeSight Software Sponsor BridgeSight Software. • In any span, the max cable sag, zd depends on the concrete cover requirements and the tendon dimensions. Design Example of a Building IITK-GSDMA-EQ26-V3. , edge beam dimensions = 14 in. Please read the lauses mentioned in the video while solving the problem. For the example building, the storey numbers are defined as follows:. 0uu u u A Tributary kips do O. The design shear force can be reduced to account for the loads applied inside the outer perimeter. 2 m, concrete: C25/30, Reinforcement steel: B500C, proposed tensile reinforcement: Ø10. Part Two is an example-intensive course, with key concepts introduced along the way. Slab Reinforcement. Computer analysis of two-way slab. While there is a dearth of published research available describing the behavior of two-way slabs with bonded tendons, the author has received. Design of stair case with central stringer beam. Beams of width and depth are provided on all column lines; thus the clear-span dimensions for the two-way slab panels are. 0 k/ft M, kip-ft 38. Required reinforcement is displayed in a very. One way slab being supported on two opposite sides only leads to the structural action in single direction. A2-Slab thickness design by WRI method A3-Design examples using COE charts A4-Slab design using post-tensioning A5-Shrinkage-compensatingconcreteexamples CHAPTER l-INTRODUCTION l. Note: One-way spanning slabs should be treated as beams of unit width and Chapter 2 should be followed except for minimum shear reinforcement. 0uu u u A Tributary kips do O. I have developed a Microssoft Excel Software for Design of a Two Way RCC Slab. Apr 25, 2020 - PPT - Design of Two way Slab Civil Engineering (CE) Notes | EduRev is made by best teachers of Civil Engineering (CE). The terms are used interchangeably. In two way slabs, load will be carried in both the directions. Thickness of slab. Download: BS 8110 CONCRETE DESIGN FOR SLAB. 3 Non prestressed two-way construction - 9. Professor Emeritus. A circular slab is a two-way slab. txt) or read online for free. Fundamentals of Post-Tensioned Concrete Design for Buildings – Part One covers related topics such as punching shear for two-way slabs and moment transfer at. Next Review on 'Calculations for Machine Design by Thomas H. 0 k/ft M, kip-ft 38. flat slabs and pad foundations Shear There are three approaches to designing for shear: • When shear reinforcement is notrequired e. ONE WAY SLAB here i solve a probleam based on the one way slab, the diamentions are provided in the probleam 1st determine the aspect ration and with respect to the aspect ratio the type of slab. 1382 Section Suspended Basement Slab design -1 Sheet no. This section will explain how the direct design method is used. 1(a)], in which the structural action is essentially one-way, the loads being carried in direction perpendicular to the supporting beams or walls. The example presented here is for Two-Way Post-Tensioned Design. 1—Minimum slab thickness. for other hand the length to breadth ratio is then two the slab is designed as two way slab (ly/lx <2 ). 0 m centers. A review of the design values suggests that a more balanced design option for the subject matter floor slab would be to increase the amount of post-tensioning provided. Chajjas and verandahs are an practical example of one way slab. , edge beam dimensions = 14 in. Interior Bay Dimensions 20' 24' This example is to be used for educational purposes only. Example C6. Note: One-way spanning slabs should be treated as beams of unit width and Chapter 2 should be followed except for minimum shear reinforcement. ft-k 8 2 2 1 l wlM 86. 5 Kn/m Wall load = 2 Kn/m Live load = 2 Kn/m Total U. In flat-plate floors, slab-column connections are subjected to high shear stresses produced by the transfer of axial loads and bending moments between slab and columns. CE 433, Fall 2006 Slab Design Example 1 / 6 Design a one-way slab for an exterior bay of a multi-story office building using the information specified below. Effective depth of slab in y-direction d y = 250 - 25 - (16/2) = 217 mm. RCC Slab Design depends on the on the dimensions of the slab after which the slab is termed as a one-way slab or a two-way slab… In the design of RCC structures, Column Design and Beam Design are to be done before we start with RCC Slab Design… Basic Rules followed in the design of simply supported Slab. tensioned slab structures, especially post-tensioned flat slabs*. Design the slab system shown in Figure 1 for an intermediate floor where the story height = 12 ft, column cross- sectional dimensions = 18 in. OPTIMUM COST DESIGN OF REINFORCED CONCRETE SLABS USING « 543 continuous slab that depends on the type of slab supports. Design Of Two Way Slab Example Pdf. The Dimensions of an interior bay are shown in Figure 1. OF TWO-WAY SLABS BY GERALD C. for two - way slab along the longer span shall be placed below 1. l-Purpose and scope Consistent with the mission of ACI Committee 360, this report presents state-of-the-art information on the design of slabs on grade. For a two way slab the ratio of ly/lx shall be ≤ 2. As the support geometry. Here ratio of longer span of slab to the shorter span of slab is greater than 2. Definition: Slab is a common term used to describe the structural elements such as floors and roofs where the thickness of the element is very small compared to the length and. Two way RCC slab designing tool in Microsoft excel developed by Shankar Tayal a 3rd year student of school of infrastructure, Indian Institute of Technology, Bhubaneswar. 20 TWO-WAY SLABS Service (final) stresses Tension stress as multiple of (f'c)^1/2. The effect of fixing the corners of the slab against lifting 5. Plan View of Floor System Assume partitions will not be damaged by deflections. Before going to this topic, Please read it. Two way slab 1. Similar searches: Bs 8110 Concrete Design For Slab How To Pour A Concrete Slab Concrete Beam And Slab Bridge How To Pour A 26x36 Concrwte Concrete Slab Design Of Two Way Slab Example Pdf Flat Slab Design Pdf Design Of Steel-to-concrete Joints - Design Manual Design Concrete Concrete Design Mix Concrete Design Design Of Concrete Structures Pdf. 25 MPa fy = 300 MPa Analysis and Design of Slabs Two Way. Reinforced Concrete Design to BS8110 Structural Design 1 - Lesson 5 5 4. Can be used for larger spans with relatively higher cost and higher deflections One-way joist system suitable span 6 to 9m with LL= 4-6KN/m2. OPTIMUM COST DESIGN OF REINFORCED CONCRETE SLABS USING « 543 continuous slab that depends on the type of slab supports. One-way slab design. Analysis and Design of Slabs Two Way. Slab shear strength - two-way shear Check the adequacy of slab thickness for punching shear (two-way shear) at an interior column (Figure 4): Tributary area for two-way shear is 16 5. This Report is intended to serve as a manual of good practice for the design of prestressed concrete flat slabs. Cantilever Slab Design Calculation & Procedure Design of cantilever slab to Eurocode 2 Span of slab 1. 5 Kn/m Wall load = 2 Kn/m Live load = 2 Kn/m Total U. Two-Way Slabs: Elastic Frame Method 14-1 INTRODUCTION A23. One-way slabs (for m=l l /l s >2) b. pdf - Free download Ebook, Handbook, Textbook, User Guide PDF files on the internet quickly and easily. Application of the yield line theory for more complex situations 8. Flat slabs are two-way slabs supported by point-like supports. This spreadsheet performs an analysis and design of two-way spanning reinforced concrete slab. Concrete Slabs Design Example - Free download as PDF File (. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. This section will explain how the direct design method is used. According to ACI-318-1963. They may be supported on two opposite sides only [Fig. Limit analysis provides a powerful tool for treating such problems. m 88BB ll M wl M wl. for other hand the length to breadth ratio is then two the slab is designed as two way slab (ly/lx <2 ). The direct design method. Example: Design the 4 marked slab panels of an ordinary house. 27 Design Example 1 (Typical House with 2 Rooms and Verandah). Two‐Way Slabs Two‐way framing action Spans typically up to 40 ft (12. In addition to the recommended procedures, other methods are described for the sake of completeness and to compare different methods of design. CE 403, Fall 2015 Slab Design Example 1 / 5 (ACI 318‐11 Referenced) Design a one‐way slab for an interior bay of a multi‐story office building using the information specified below. 3 STEP-BY-STEP DESIGN PROCEDURE FOR SLABS Step 1 Analysis Carry out analysis (follow Section 3. Before going to this topic, Please read it. Two way slabs are the slabs that are supported on four sides and the ratio of longer span (l) to shorter span (b) is less than 2. pdf from CIVIL ENG. For the example building, the storey numbers are defined as follows:. Two Way Slab: Two way slab is supported by beams on all the four sides and the loads are carried by the supports along both directions, it is known as two way slab. (3) All Slab Design examples have been updated to report the slab design forces rather than the strip forces. Note: One-way spanning slabs should be treated as beams of unit width and Chapter 2 should be followed except for minimum shear reinforcement. The PDF covers the following topics: Properties of flat slab. Slab shear strength - two-way shear Check the adequacy of slab thickness for punching shear (two-way shear) at an interior column (Figure 4): Tributary area for two-way shear is 16 5. The values of G are given in Table 1. 0, slab is called two-way slab, as shown in the fig. usually one and two-way spanning slabs • Punching shear –e. Cornell University, David Darwin (University of Kansas), Charles Dolan (University of Wyoming) 3. shown on pages 42 and 43 of our Design Manual and Catalog of Steel Deck Products. Rooms (two way slabs) are continuous with verandah (one way slab). , and unfactored live load = 100 psf. input cells automatically cross out invalid data 3. Design of Slab(Two Way) Excel Sheet. This system consist of both one way and two way slabs. When a rectangular slab is supported on all the sides and the length-to-breadth ratio is less than two, it is considered to be a two-way slab. European Commission Joint Research Centre Institute for the Protection and Security of the Citizen Contact information Address: Joint Research Centre, Via Enrico Fermi 2749, TP 480, 21027 Ispra (VA), Italy. ACI 318 provides two alternative methods for designing two-way slabs for concrete, The equivalent frame method? (EFM) and the direct design method (DDM). Material: C30. The mesh designated 6 x 6 - W2. for other hand the length to breadth ratio is then two the slab is designed as two way slab (ly/lx <2 ). • This condition occur when the slabs are connected monolithically with support. flat slabs. Essential spreadsheet for two way slab design. I have developed a Microssoft Excel Software for Design of a Two Way RCC Slab. The 2012 edition of the Reinforced Concrete Design Manual [SP-17(11)] was developed in accordance with the design provisions of ACI 318-11, and is consistent with the format of SP-17(09). The coefficient method may be the simplest, easiest and the quickest approach for the design of two-way slab supported by edge beam on all slab sides. Two-Way Slab Design Based on ACI 318-11 using Finite Element Method. Design Example of a Building IITK-GSDMA-EQ26-V3. automatic generation of a step by step design calculation. This document is highly rated by Civil Engineering (CE) students and has been viewed 973 times. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. ASCE, SECB COURSE CONTENT Slab on Grades Construction: Introduction Concrete slabs on grade are a very common type of concrete construction. One-way and Two-way Slabs One-way slabs transfer the imposed loads in one direction only. 3 Example 2 - Rectangular Two-Way Slab Designed to AS 3600-2000 Using 500PLUS design Slabs, Slabs,. 1 Design and Rating Requirements All new concrete slab structures are to meet design requirements as stated in 17. Flat Slab Design [PDF Document]. Unless otherwise. Direct design method, that could have been named the direct analysis method because it determines or prescribes moments for different parts of the slab panel without the need to conduct structural analysis, is explained in the following sections. Net and PTPlus. TIME SAVING DESIGN AIDS Two-Way Slabs Page 1 of 14 The following example illustrates the design methods presented in the article “Timesaving Design Aids for Reinforced Concrete, Part 2: Two-way Slabs,” by David A. The design shear force can be reduced to account for the loads applied inside the outer perimeter. pdf), Text File (. The direct design method is an approximate method used to analyze two way slabs. shown on pages 42 and 43 of our Design Manual and Catalog of Steel Deck Products. 0 m centers. The method of Marcus 4. In two way slabs, load will be carried in both the directions. In two way slabs, load will be carried in both the directions. INTRODUCTION In reinforced concrete construction, slabs are used to provide flat, useful surfaces. Preliminary Design of Slab Thickness Thickness design depends on boundary conditions (supports). Neglect compression reinforcement. Beams, see Lecture 3 • Punching shear requirements e. Part Three is an example-intensive course, with key concepts introduced Fundamentals of Post-Tensioned Concrete Design for Buildings - Part One. txt) or view presentation slides online. RC Slab Design EC2 - Worked example - Bending reinforcement - Duration: 14:57. Previously known as Method 3 of the 1963 ACI Code. It can be used by both practicing Engineers and students. 1—Minimum slab thickness. When a slab is supported on all four sides and the ratio of long span to short span is equal or greater than two, it will be considered as one way slab. Thickness of slab. Part Three now continues with the study of two-way, post-tensioned slab systems, including a complete design example using the Equivalent Frame concept. The service live load is 100 psf, and 4000 psi concrete is specified for use with steel with a yield stress equal to 60,000 psi. Two-way Slab Design using the Coefficient Method - Free download as PDF File (. Step 2 Design forces Draw panel of slab and indicate maximum design moments, shears and in-. This example is to be used for educational purposes only. RCC Dog-legged Staircase design Excel Sheet. In two way slab, the ratio of longer span (l. xlsm Member Design - RC Two Way Spanning Slab 03-09-15 CONSULTING E N G I N E E R S All Beams Beam y Sag Beam y Hog Beam x Sag Beam x Hog Made by Date Chd. 00075tc(12), where tc is the concrete cover. Two way slab 1. Two-Way Flat Plate Concrete Floor System Analysis and Design. 5 it behaves as one-way slab. nice user-friendly interface 2. Solution: Panel Edge. 3 Limit States Design Method 18. 8 CHAPTER 8: DESIGN OF ONE-WAY SLABS 8. This spreadsheet performs an analysis and design of two-way spanning reinforced concrete slab. The two-way slab S1 is supported by four beams < project: slabs20> Two-way slab behaviour The behavior of a two-way slab is similar to that of a one-way slab the only difference being that now the slab loads will be carried in both directions. 5m Variable load 4kN/mm2 Slab thickness 175mm Fck 25N/mm2 fyk 500N/mm2 Cover to the reinforcements 25mm Office building Slab loading. In order to simplify the analysis and to be able to use the superposition principle for evaluating the effect of load combinations, linear analysis is generally adopted even though concrete slabs normally have a pronounced non-linear response. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near mid-span. Design the slab system shown in Figure 1 for an intermediate floor where the story height = 12 ft, column cross- sectional dimensions = 18 in. Moment CoefficientMethod for two way slabs Direct DesignMethod for two way slabs Analysis and Design of Slabs Department of Civil Engineering, University of Engineering and Technology Peshawar, Pakistan Prof. Part Three we will now continue with the study of two-way, post-tensioned slab systems, including a complete design example using the Equivalent Frame concept. Two way slab 1. 25 Kn/m Floor finish = 2 Kn/m Filling load = 3. Shorter direction steel will be placed near the outer edge to get more “d” means more lever arm to get more flexural capacity. The spreadsheet takes user input values for the slab design parameters such as dimensions and concrete strength, and inputs for the design moments and shear forces. Thanks in advance. 2 m, concrete: C25/30, Reinforcement steel: B500C, proposed tensile reinforcement: Ø10. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types; one-way and two-way. CHAPTER 6—SERVICEABILITY CONSIDERATION. Self weight = 200x25x10. A reinforced concrete slab is built integrally with its supports and consists of two equal spans, each with a clear span of 15 ft. Download Two way Slab Design Excel Sheet Template. They may be supported on two opposite sides only [Fig. Refer to Fig. Depending on the boundary condition and the properties of the slabs, methods of finding bending moment is expressed in the BS 8110 Part 01 as follows. In above figure (a) represents one way slab. The effect of fixing the corners of the slab against lifting 5. Rectangular Beams and One-way Slabs Page 2 of 9 Two Methods: 1. (6), the maximum value of moment coefficient for four different support conditions (simply-supported, continuous at one end and simply-supported at the other, continuous at. Slabs may be classified into 2 types depending on ratio of larger side to shorter side, its recommended in IS 456 to design slabs having (ly/lx) ratio greater than 2 as one way slab and slabs having (ly/lx) less than 2 as two way slab. Download Two way Slab Design Excel Sheet Template. The integral wearing surface is considered in the weight calculations. This spreadsheet is an extremely efficient tool and allows to quickly design two way slabs to aci code. (3) All Slab Design examples have been updated to report the slab design forces rather than the strip forces. 5" occurring anywhere in the span. Reinforced Concrete Buildings Series Design Booklet RCB-2. Storey number Storey numbers are given to the portion of the building between two successive grids of beams. A reinforced concrete slab is a broad, flat plate, usually horizontal, with top and bottom surfaces parallel or nearly so. One way concrete slab bends or deflects in a direction perpendicular to the supporting. Chajjas and verandahs are a practical example of one way slab. Bending will take place in the two directions in a dish-like form. A slab is supported four direction however to taken the ratio b/w length to breadth than the ratio is greater than or equal two ( ly/lx >2) the slab is designed as one way slab. Comparison of One-way and Two-way slab behavior One-way slabs carry load in one direction. Concrete Slab Design - Two Way Slab Direct Design Method. Chajjas and verandahs are an practical example of one way slab. Practical Yield Line Design 2 Notation Symbols The symbols used in this publication have the following meaning: Symbol Description Units A Area of column cross-section m2 a, b, c Plan dimensions of slab supported on several sides m. Flat slab Two-way slab with beams 4. Design of Concrete Structures 14th Edition, 2009, by Arthur H. The PDF covers the following topics: Properties of flat slab. Design Of Reinforced Concrete Structures ii Two-Way Slabs 1 1. The one-way slab is deflected in one way direction. • A slab strip of unit width is analysed using simple beam theory. The load on the slab is carried by the short span in one direction. 75 2 (18 14) ( ) 248. Flexural Deflection in ACI 318-02 Controlled in Section 9. 10m (min) compacted 24 dia. So, main reinforcement is provided in both direction for two way slabs. Slab design is comparatively easy when compared with the design of other elements. TIME SAVING DESIGN AIDS Two-Way Slabs Page 1 of 14 The following example illustrates the design methods presented in the article “Timesaving Design Aids for Reinforced Concrete, Part 2: Two-way Slabs,” by David A. RCC Slab Design depends on the on the dimensions of the slab after which the slab is termed as a one-way slab or a two-way slab… In the design of RCC structures, Column Design and Beam Design are to be done before we start with RCC Slab Design… Basic Rules followed in the design of simply supported Slab. usually one and two-way spanning slabs • Punching shear –e. 1 and rating requirements as stated in 17. 7 12 A Tributary u ft2 V q 0. For the Direct Design Method moments are found using a simplified. This system consist of both one way and two way slabs. The numbering of the members is explained as below. Slab Reinforcement. Fundamentals of Post-Tensioned Concrete Design for Buildings – Part One covers related topics such as punching shear for two-way slabs and moment transfer at. The following example illustrates the design methods presented in the PCA book "Simplified Design-Reinforced Concrete Buildings of Moderate Size and Height" third edition. 2 Design Data. SHEAR DESIGN IN FLAT PLATES AND FLAT SLABS When two-way slabs are supported directly by columns, as in flat slabs and flat plates, or when slabs carry concentrated loads, as in footings, shear near the columns is of critical importance. Design of two way slabs(d. Interior Bay Dimensions 20' 24'. D = 130 mm d = 105 mm Loads on slab Self weight of slab = 3. 7 Two-Way (Waffle) Flat Slab Design plications will be illustrated in the design examples following. The allowable soil pressure is 5. 3 review question. Similar searches: Bs 8110 Concrete Design For Slab How To Pour A Concrete Slab Concrete Beam And Slab Bridge How To Pour A 26x36 Concrwte Concrete Slab Design Of Two Way Slab Example Pdf Flat Slab Design Pdf Design Of Steel-to-concrete Joints - Design Manual Design Concrete Concrete Design Mix Concrete Design Design Of Concrete Structures Pdf. Deep ribs, the concrete and steel quantities are relative low Expensive formwork expected. Excel Sheet to Design Slab - One Way and Two Way > Share: Rate: Previous Computational Methods for Fluid Dynamics by Ferziger. c) Limiting crack width under increased (design/service) loads or sus-tained loads. Depending on the boundary condition and the properties of the slabs, methods of finding bending moment is expressed in the BS 8110 Part 01 as follows. An optimal plan geometry with all same supports is a square, based on load distribution into both directions. The slab spans in both […]. 3 of ACI 318 allows the use of shear reinforcement for slabs and footings in the form of bars, as in the vertical legs of stirrups. Slabs are usually used in floor and roof construction. 0uu u u A Tributary kips do O. 0 k/ft M, kip-ft 38. Storey number Storey numbers are given to the portion of the building between two successive grids of beams. Flat Slab Design [PDF Document]. Plan View of Floor System Assume partitions will not be damaged by deflections. Equilibrium frame method. This can be used in conjunction with a structural analysis program such as our Slab Analysis Tool. b) Corrosion of the reinforcement. Chajjas and verandahs are an practical example of one way slab. 2: Behavior of Two way slab.