Design of reinforced concrete structures ii twoway slabs. Two way slab a bending of center strip, b grid model. Same as the distribution steel analysis and design of slabs. Moments for design may be taken from table 3 for slabs simply supported on four sides. The main objective of this project is to analyze and design a multistory building 3ddimensional reinforce concrete frame, the design of reinforced concrete slabs, beams, columns, footings and. Ultimate behavior of one way spanning slab linear elastic analysis. Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for one way and two way slabs as per is 456. Design criteria there are three criteria which must be considered for the design of a conventional one way slab system. Normally it works fine but this time after carrying out the calculations the slabs fail in shear because of there are some huge point loads near the support. Difference between one way slab and two way slab daily civil. Chapter 3 design of rectangular beams and oneway slabs. The ratio of longer span l to shorter span b is equal or greater than 2, considered as one way slab because this slab will bend in one direction i.
This strip is designed basically as if it were a 12inchwide beam, t inches thick. Beamless slabs beamless slabs are supported only on columns and are applied mostly in large industrial and public. The design of a composite beam involves a number of choices. Design of a two way rcc slab structural engineering. Explain the range in x, y and z directions and group. In one way slab, the loads are carried along one direction. The proposed slab system must meet the current code.
The proposed slab system must be able to be constructed at a reasonable cost. As they are one way slabs i treat them as wide beams. Assume partitions cannot be damaged by deflections. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Design of two way slabs is 456 limit state method youtube. Caprani civil engineering design 1 analysis and design of slabs. Following are the rcc slab design and detailing guidelines. Reinforced concrete slab design and detailing guide is456. Main reinforcement will be provided on both sides sometimes. 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. Design procedure steps for one way slab slab design steps.
Posttensioned oneway slab pennsylvania state university. One way spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. Oneway and twoway slabs university of asia pacific. Oneway and two way slabs one way slabs transfer the imposed loads in one direction only. Flat slab haunched slab a longitudinal slab is one of the least complex types of bridge superstructures.
One way slab is supported by two parallel beams or walls. Continuous oneway solid slab concrete structures eurocode. Etabs modeling design of slab according to ec2 24,615 views. Daikin applied daikin applied is a member of the global air conditioning company, daikin industries. How to build a deck step by step building a deck trex. I am doing one way slabs and hope you can clean up my doubts about the one way shear in slab. Here are the steps for the design procedure for one way slab in steps. Oneway and twoway slabs oneway slabs transfer the imposed.
Lecture series on design of reinforced concrete structures by prof. The process of designing elements will not be revolutionised as a result of using eurocode 2. Hi bro, do you have design example of rectangular manhole. Generally, there are two types of slab which are one way and two way slabs. Just drag and drop thumbnails to rearrange your pdf the way you want. Here ratio of longer span of slab to the shorter span of slab is greater than 2. In this article, i will discuss one way slab design procedure with example. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan.
For 1m slab width, moment, shear force, one way continuous slab for continuous slab, moment and shear force can be obtained from table 3. 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. Rectangular beams and one way slabs page 2 of 9 two methods. Step 2 design forces draw panel of slab and indicate maximum design moments, shears and in. Effective span of slab shall be lesser of the two 1. The two classifications are one way slab and two way slab. However, it should be known that the coefficient method is still applied for two way slabs. Difference between one way slab and two way slab simple. For those who do not know what are the des ign requirements of a slab. Bending will take place in the two directions in a dishlike form.
In two way slab, the slabs are supported on all the four sides. 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. One way slab is a slab which is supported by beams on the two opposite sides to carry the load along one direction. The procedure of the design of oneway slab is the same as that of beams. A civil engineer should study these lectures and materials for structural engineering acumen. For flat plates and slabs the column connections can vary between. A 175 mm thick continuous slab is required to support screed, finishes, an office variable action of 2. Design procedure of two way slabs using aci moment coefficients. One way slabs are such slabs in which the loads are shared only by the shorter direction of the slab. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books.
The slab is supported on 200 mm wide loadbearing block walls at 6000 mm centres. One way shear in slab structural engineering general. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. 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. Reinforced concrete slab design using the empirical method. The load on the slab is carried by the short span in one direction. Flat slab analysis and design pdf flat slab design pdf 1. Distribute moments transverse at critical sections to column and middlestrip and if.
Chapter 18 concrete slab structures january 2019 183 18. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Reinforced concrete slab design using the empirical method bridgesight solutions for the aashto lrfd bridge design specifications bridgesight software tm creators of effective and reliable solutions for the worlds bridge engineers. Reports and recommendations have been undertaken and prepared by several study groups for the purposes of developing design criteria or extending the criteria for selection and design of residential slabs onground. They may be supported on two opposite sides only fig. Distribute moments transverse at critical sections to. Here, we will discuss the various considerations involved in the selection process and some typical ways that engineers approach the problem. Design procedure the basic design procedure of a two way slab system has five steps. Two way concrete slabs with openings the static system and the design of reinforcement. One way slab being supported on two opposite sides only leads to the structural action in single direction. The execution of the design will be explained with reference. Now youve also got an easy way to combine and organize them all into one pdf.
Pdf the article is about design of prestressed slabs. One way slab design procedure with example design of one. Daikin applied daikin applied is a member of the global. Two way slab design by direct design method as per aci 31811. The general provisions for construction and design procedure are given in cop 20. A 2 2area 2 a c 2 2 posttensioned concrete design table 11 list of symbols used in the aci 31808 code cp area enclosed by the outside perimeter of the section, in a g gross area of concrete, in a 2 l total area of longitudinal reinforcement to resist torsion, in a o area enclosed by the shear flow path, sqin a oh area enclosed by the centerline of the outermost closed. Reinforced concrete design 1 design of slab examples. L center to center distance between the support b depth of slab. Analysis and design of slabs one way civil engineers pk. Before we start the design of slabs, let us see what our words says related to your effective. Design of twoway slab by coefficient method the constructor. I have developed a microssoft excel software for design of a two way rcc slab. Assume a collapse mechanism by choosing a pattern of yield lines.
Assign the loads on a structure and compare the results with the manual calculation. Define the term slab, one way slab, two way slab, shrinkage and temperature reinforcement, main reinforcement. How to merge pdfs and combine pdf files adobe acrobat dc. The codes governing the design of the one way slab will be aci 31802 and ibc 2003. Ce 403, fall 20 one way slab design 2 4 aci 31811 referenced pp 2 4 typical concrete floor systems copied from ceco concrete construction pamphlet design procedure a one way slab is designed by considering a one footwide strip of slab.
One way simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. 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. Two way slab design by direct design method as per aci 31811, step by step procedure and limitations of direct design method for two way slab is presented. These conditions are set out in last section dealing with one way ribbed slabs. Then check out our tips and checklists for hiring a deck builder. So, our problem let us start with 1 example, design of 1 way slab.
Daikin applied is a manufacturer of energyefficient commercial hvac systems for heating, ventilation and air conditioning. 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. Typically the concrete slab acts as a beam spanning between supporting beams. The design procedure for a uniformly loaded one way reinforced slab can be divided in the following steps. Flat slab analysis, design and detailing pdf civil. Calculation of approximate depth from deflection criteria cl 23. Two way concrete floor slab with beams design and detailing design the slab system shown in figure 1 for an intermediate floor where the story height 12 ft, column crosssectional dimensions 18 in. The following example illustrates the design methods presented in aci 31805 and ibc 2003. I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects. 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. Dhang, department of civil engineering, iit kharagpur. You can even organize pages after merging multiple files into a single pdf. Lec23 analysis and design of slabs free download as powerpoint presentation.
The slab has to carry a distributed permanent action of 1. In one way slab, the slabs are supported by the beams on the two opposite sides. Continuous beam if it is the other way, for end span with 1 end fixed and the other. Calculate aspect ratio aspect ratio 2 longer spanshorter span 2. It shows possible solutions of two way prestressed floors depending on different factors. 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.
These materials are originally located at different websites. No file limit, no ad watermarks a free and beautiful tool to combine your pdf files exactly the way you want it. Concrete slabs are commonly divided into the following types. Comparison of one way and two way slab behavior one way slabs carry load in one direction. Design of reinforced concrete structures ii two way slabs 1 1. Allowable stress design or working stress design wsd 2.
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