The waffle slab is also sometimes termed as ribbed slab system but you would find it interesting to know that ribbed and waffle slab are somehow two different things. Designing for shear in slabs including punching shear detailing solid slabs flat slab design includes flexure worked example exercise punching shear. The pca computer program pcaslab can be used to expedite the design of different slab systems. Example calculations for this and all other example problems the following data from the canam united steel deck design manual and catalog of steel deck products will be used and are worked using lrfd methodology. Ribbed slab design spreadsheets to eurocode engineering. A single slab with oneway reinforcement rebars will be analyzed with rcsolver. Use i wsd, ii usd to design the twoway slab shown below, carrying floor finish 30 psf, random wall 50 psf and live load 60 psf given. One way and two way slab design aspect online civilforum. Two way joist waffle slab design approach and methodology two way joist slab often called two way ribbed slab or waffle slab is an economical floor system when the spans are long andor loads are high.
Reinforced concrete oneway slab design pd49gzkzp2n9 idocpub. First designs to follow the brab report required foundations heavier even than the san antonio. One way and two way slabs one way slabs transfer the imposed loads in one direction only. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. Distribute moments transverse at critical sections to column and middlestrip and if. The hand solution is used for a detailed comparison with the analysis and design results of the engineering software program spbeam. In one way ribbed slab, loads are transferred in one direction, and the main reinforcement is distributed in the same direction of the load. For design of twoway slabs, see chapters, 5, 6, and 7. D mm d 105 mm loads on slab self weight of slab 3. One way simplysupported and continuous solid slab free download as powerpoint presentation. Continuous one way slab example 16 figure below shows a first floor plan of an office building. Pdf in the last two decades, the use of voided bubbled slabs in constructions has been increased because of several advantages such as. The service live load is 100 psf and 4000 psi concrete is specified for use with steel with a yield stress equal to 60000 psi.
Rectangular beams and one way slabs page 2 of 9 two methods. One way spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. One way slab supported on beams the objective of this tutorial is to demonstrate the stepbystep procedure of adapt pt to analyze and design a posttensioned continuous slab supported on parallel beams or walls. Two way flat plate concrete floor system analysis and design 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. Design procedure steps for one way slab slab design steps. Even while designing they are considered as one slabs with cantilever fixed or continuous at supports. Analysis and design of slabs, one way slabs, online free slab design, design of slabs one way, free slab design online, design procedure for one way slab.
Chapter 3 design of rectangular beams and oneway slabs 12. The direction in which the load is carried in one way slab is called the span. I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects. I have developed a microssoft excel software for design of a two way rcc slab.
Rectangular beams and oneway slabs page 3 of 9 design of rectangular beams and oneway slabs continued a. A detailed explanation will be given of the checksto be carried out, the aspects to be considered in the design and the construction procedures and sequences of a posttensioned slab. They are projections from wall face of lintel beams or floor slabs. Chapter 3 design of rectangular beams and oneway slabs. Pdf experimental study of shear in reinforced concrete one. If slab is supported on all four sides and r shorter side longer side one way slab. Example design of two way edgesupported solid slab. One way simplysupported and continuous solid slab bending. Design of reinforced concrete structures ii two way slabs 1 1. The design procedure for a uniformly loaded one way reinforced slab can be divided in the following steps. Pdf structural behavior of reinforced concrete oneway slabs. A copy of the tables is provided in the appendix and also. Oneway and twoway slabs oneway slabs transfer the imposed.
One way slab design procedure with example design of one. So, we have a few more lecturers, so today we shall. Designing of slabs depends upon whether it is a oneway or a two way slab. Pdf shear in oneway slabs under concentrated load close to.
Allowable stress design or working stress design wsd 2. Slab with reinforcement with yield stress, f y, exceeds 60,000 psi measured at a yield strain of 0. Plan view of floor system assume partitions will not be damaged by deflections. Design of reinforced concrete structures ii twoway slabs 1 1. Master of science and hereby certify that, in their opinion, it is worthy of acceptance. When one says ribbed slab it is actually a one way spanning system with ribs where as in waffle slab the joists form a two way. The reinforced concrete design handbook now provides dozens of design examples of various reinforced concrete members, such as one and two way slabs, beams, columns, walls, diaphragms, footings, and retaining walls. The tensile strength of concrete is neglected in flexural strength calculations aci sec. The proposed slab system must meet the current code. Design of reinforced concrete structure one way slab presented by md. The output of the program for the slab in the example is shown in the following pages. Bending will take place in the two directions in a dishlike form. History of two way slabs the feeling at start that only part of the load to be carried in each direction, so that statics somehow did not apply to slab construction. The slab is to be finished with 25 mm thick cement concrete flooring.
Rc slab design ec2 worked example bending reinforcement. Shear in oneway slabs under concentrated load close to support article pdf available in aci structural journal 1102. 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. How to design a two way slab free download as powerpoint presentation. Pdf reinforced concrete oneway slabs subjected to concentrated loads are. Here are the steps for the design procedure for one way slab in steps.
One way slab is the most basic and common type of slab. One way slab design excel sheet civil engineers pk. This paper presents an experimental and computational study on ribbed slabs with widebeam, two one way slabs and two two way slabs, with variable depths were tested to evaluate their resistance. The variables that describe the geometry of a twoway panel within a floor system, however, are so extensive that it becomes impractical to compile a meaningful set of tables or relationships without extensive approximation. The codes governing the design of the one way slab will be aci 31802 and ibc 2003. The behaviour of reinforced concrete beam sections at ultimate loads has. Introduction within the last several years there has been a lot of interest in a design procedure for the. Pdf oneway slabs subjected to combination of loads failing in. Feb 07, 2014 a short tutorial showing how the main reinforcement in a simply supported slab is designed using ec2.
Rcc design excel sheet rcc design excel sheet provides beam design, column design, slab design. Design of slabs today, we shall start design of slabs. Ce 433, fall 2006 slab design example 1 6 design a one way slab for an exterior bay of a multistory office building using the information specified below. Design criteria there are three criteria which must be considered for the design of a conventional one way slab system. Bridge approach slab analysis and design incorporating elastic soil support presented by. One way and two way slab design aspect the slab provides a horizontal surface and is usually supported by columns,beams or walls. Oneway and twoway slabs university of asia pacific. J joshi2, 3rohit raj, prem prakash mishra4, mamta kadhane5, bharati mohabey6 civil engineering, rajarshi shahu college of engineering, pune, maharashtra, india abstracta voided slab is a concept that simply removes the. Fundamentals of posttensioned concrete design for buildings part one.
Fundamentals of posttensioned concrete design for buildings. Design of cantilever slab spreadsheet engineering books. The program covers wide range of two way slab systems and can be used for more complex slab layouts. This system consist of both one way and two way slabs.
Twoway joist waffle slab design approach and methodology. The basic design procedure of a two way slab system has five steps. Introduction, definitions flat slabs are two way slabs. For those who do not know what are the des ign requirements of a slab. Strength design or ultimatestrength design usd strength design or ultimatestrength design usd with strength design method, the working dead load dl and live load ll are.
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. A reinforced concrete slab is built integrally with its supports and consists of equal span of 15 ft. Whatever may be the width of the slabs it should always be designed for a width of equal to one metre and the same design should be adopted for the rest of the slab. Rooms two way slabs are continuous with verandah one way slab. Reinforced concrete design 1 design of slab examples. Comparison of one way and two way slab behavior one way slabs carry load in one direction. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types. The 2012 edition of the reinforced concrete design manual sp1711 was developed in accordance with the design. In flatplate floors, slab column connections are subjected to high shear stresses produced by the transfer of axial loads and bending moments between slab and columns. A typical sixspan, one way slab supported on beams,as occurs in parking structures is selected. Slab design reading assignment chapter 9 of text and, chapter of aci31802. Shades in the roofing system cantilever slab of stairs. Flat plate concrete floor system does not use beams between columns or.
Department of mechanics, materials and structures english courses reinforced concrete structures code. Slab design much simpler than beam design concrete slabs behave primarily as flexural members and design is similar to that of beams, although in general much simpler because. Punching of flat slabs design for shear at th e column heads. In 1914 nichols used statics to compute the total moment in a slab panel. Assume partitions cannot be damaged by deflections. Design of slab examples and tutorials by sharifah maszura syed mohsin. One way slab design criteria with design example according to aci code. Department of mechanics, materials and structures english.
Accordingly, main reinforcement is required in the two directions. Introcduction slab in which the deflected surface is predominantly cylindrical termed as one way slabs spanning in the direction of curvature. Application of one way slab provides useful flat surface one way slab may be used when there is architectural limitations it is the simplest form of slab design main reinforcement placing is one way, so there is a little congestion than two way slab 29. One way slabs are such slabs in which the loads are shared only by the shorter direction of the slab. Design of a two way rcc slab structural engineering forum. Design steps of one way slab rcc vylywmjome4m idocpub. It is estimated that the 125 mm thick slab will carry 4. Reinforced concrete design 1 design of slab examples and. Step 2 design forces draw panel of slab and indicate maximum design moments, shears and in plane loads, if any, per unit width of slab. The two classifications are one way slab and two way slab. Ce 433, summer 20 slab design example 1 5 design a one.
A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. Ec2 webinar autumn 2016 lecture 52 designing for shear in slabs when shear reinforcement is not required e. Posttensioned oneway slab pennsylvania state university. They may be supported on two opposite sides only fig. Closed form formulas closed form formulas are readily available for beams and oneway slabs. Before going to this topic, please read it there are two types of slab classification based on the direction of bending occurs in these slabs. Here ratio of longer span of slab to the shorter span of slab is greater than 2. Design of reinforced concrete structures ii twoway slabs.
Pdf slabs are the flooring systems of most structures including office. The trial depth is selected based on spandepth ratio of 7, as in is. Breadth of slab is already fixed b mm shear stress are usually low in a slab. One way slabs are those supported continuously on the two opposite sides so that the load sare carried along one direction only.
His analysis suggested that the current slab design. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan. Under smartarttools, on the format tab, in the size group, do the following. The execution of the design will be explained with reference to an example. A system where a two way slab is continuous with a one way slab or vice versa is called a mixed slab system. Nov 15, 2014 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.
Design of a two way slabs for punching shear resistance. Beams of width and depth are provided on all column lines. Jul 26, 2014 this entry was posted in excel sheets and tagged excel sheets, one way slab design excel sheet, one way slab design spreadsheet, slab design excel sheet, spreadsheets by civilengineerspk. Pdf design calculation design of one way slab slab s1. The following example illustrates the example building. The analysis and design of one way slab, one way joist, interior beam, and exterior beam are shown in this example. Contains all design checks required by the american concrete institute code and all the conditions that must be met during the design. Although the major reinforcement in one way slab span is in the short direction, yet at the corner, the moment is actual supported by beams at both directions. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Define the term slab, one way slab, two way slab, shrinkage and temperature reinforcement, main reinforcement. For economical design of similar structures a smaller slab thickness leading to values between 60% to 80% of balanced selfweight is generally selected. The hand solution is used for a detailed comparison with the analysis and design results. Slabs are usually used in floor and roof construction. Analysis and design of slabs one way civil engineers pk.
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