Bending will take place in the two directions in a dishlike form. The construction and design of concrete slabs on grade. Lecture series on design of reinforced concrete structures by prof. Practical structural analysis and design of residential buildings using staad pro v8i, csc orion, and manual calculations. Generally, there are two types of slab which are one way and two way slabs. Design the minimum slab thickness to support a fork lift specified below and storage racks specified below throughout. Sci p300, composite slabs and beams using steel decking. For example, in loadspan tables the following points should be clear. 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.
So, you can calculate, we can assume certain depth and on the basis of that, we can go for calculation or replacement. Heavy loads in building s such as warehouses include moving load s, stationary live loads, and wall loads. Reinforced concrete design 1 design of slab examples. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Pdf optimum design of reinforced concrete waffle slabs. It was actually the widespread use of the posttensioned slabonground which induced this interest in design procedure and in many studies of reported slab failures. Please read the lauses mentioned in the video while solving the problem. Only the design of slab bridge will be used for illustration. Design of slab examples and tutorials by sharifah maszura syed mohsin example 2. The following example illustrates the design methods presented in the pca book simplified design reinforced concrete buildings of moderate size and height third edition. Sep 03, 2011 reinforced concrete sk 33 section through slab showing stress due to moment. As it is illustrated in the following project example, the program carries each critical feature of a floor slab s geometry to the model for an authentic analysis and design. Twoway joist waffle slab design approach and methodology twoway joist slab often called twoway ribbed slab or waffle slab is an economical floor system when the spans are long andor loads are high.
Manual design of beam and raft foundation to eurocode 2 pdf references ubani o. Ce 437537, fall 2002 slabongrade example design info 1 8 design the thickness for a slabongrade concrete slab in a warehouse. In this video deisgn of two way slabs has been covered using is 456. Ce 433, fall 2006 slab design example 1 6 design a oneway slab for an exterior bay of a multistory office building using the information specified below. Reinforced concrete, 2014, 9th edition, aci 31811 code edition, by jack c. Design example of punching shear in slabs eurocode 2. A2 slab thickness design by wri method a3 design examples using coe charts a4 slab design using posttensioning a5shrinkagecompensatingconcreteexamples chapter lintroduction l. 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. The steel deck will be used on 86 3continuous spans.
Manual design of beam and raft foundation to eurocode 2. Fanella, which appeared in the october 2001 edition of structural engineer magazine. Waffle slab analysis and design is similar to the procedure used with flat plates except that special considerations need. Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for oneway and twoway slabs as per is 456. Slabs are usually used in floor and roof construction. Title reinforced concrete slab design using the empirical method publication no. Sap 2000 tutorial session notes mit opencourseware. The design example and commentary are intended to serve as a guide to aid bridge design engineers with the implementation.
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. It is based on the design project example shown below, the complete solution of which is provided as a handout. 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 system. Adopt m 15 grade of concrete and mild steel reinforcement. Reinforced waffle slabs can be constructed for the span up to 16 meters while beyond that length prefabricated waffle slab is preferable. Tm 580912 concrete floor slabs on grade subjected to heavy. Twoway joist waffle slab design approach and methodology.
Reinforced concrete slab design and detailing guide is456. The following example illustrates the design methods presented in aci 31805 and ibc 2003. Find the following parameters for design moments in step 2 per unit width step 4 note. Following are the rcc slab design and detailing guidelines. Ultimate behavior of oneway spanning slab linear elastic analysis. Slabs and flat slabs lecture 5 19 th october 2016 contents lecture 5 designing for shear in slabs including punching shear detailing solid slabs flat slab design includes flexure worked example exercise punching shear.
Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabs onground. Design of two way slabs is 456 limit state method youtube. Waffle slab or ribbed slab construction procedure and. Nagy 1 and istvan szatmari 2 technical university of budapest, department of steel structures h1521 budapest summary there is an enhanced intention imposed on building construction industry to improve time and structural efficiency of structures. Lrfd design examples federal highway administration. There are many methods that are used to analyze twoway slabs and the precision of these methods vary depending. Flat slab analysis, design and detailing pdf flat slab system is an important division of concrete floor system.
Optimum design of reinforced concrete waffle slabs alaa c. Reinforced concrete design 1 design of slab examples and. Steelreinforced slabs, typically between 100 and 500 mm thick, are most often used to construct floors and ceilings, while thinner mud slabs. Analysis of two way ribbed and waffle slabs with hidden beams. Equivalent tensile stress design appendix 5examples using shrinkagecompensating concrete, p. Two leak tests one for the sampling train and one for the sample probe should be conducted for every sub slab vapor sample in order to establish air tightness. The following example illustrates the example building.
The slab is supported on beams of size 225 x 500 mm spaced at 4. Design of reinforced concrete structures ii twoway slabs 1 1. Unless otherwise noted, all referenced table, figure, and equation. Lrfd design example for steel girder superstructure bridge. Jul 22, 2015 design of two way ribbed slab 18 x 25 m clear span 1. Although not accounted for in the design, the link slab also acts as a semirigid link between spans transferring compressive, tensile, and shear stresses due to horizontal loads. 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. If you continue browsing the site, you agree to the use of cookies on this website. For the flat slab with the general arrangement as shown below, let us design the punching shear for column b1 given the following design information.
Download file pdf flat slab manual design bs flat slab manual design bs flat slab design example part 1 how to design a flat slab, step by step explained in this video. How to design concrete structures using eurocode 2. The best book to refer to is reinforced concrete design to eurocode by bill mosley. Are the loads that are given nominal values or design values. Oneway and twoway slabs oneway slabs transfer the imposed. Flat slab 1 design slab rc slab design ec2 worked example bending reinforcement a short. Western bridge preservation partnership meeting phoenix, arizona may 1214, 2020. The lateral loads are independently resisted by shear walls.
The superimposed load on the slab is to be 3500 n per square metre. The slab is to be finished with 25 mm thick cement concrete flooring. Design of staircase examples and tutorials by sharifah maszura syed mohsin example 2. Waffle slab is good against shrinkage and it is lower than stiffened rafts and footing slabs. Must watch basics of flat slab for better understanding from the link. Twoway joist concrete slab floor waffle slab system. Design of reinforced concrete structures ii twoway slabs. Waffle slab design example structural engineering general.
Analysis and design of slabs two way civil engineers pk. The recommendations derived from these and other studies vary from extremely light to extremely heavy. This document consists of a comprehensive steel girder bridge design example, with instructional commentary based on the aashto lrfd bridge design specifications second edition, 1998, including interims for 1999 through 2002. The bearing of the slab on the supporting walls may be taken as 230 mm. This is supplemented by a fully worked design example for a composite beam in a 15. Example composite design design composite concrete slab on steel deck floor for 125 psf live load. Flat slab analysis, design and detailing pdf civil.
Asce, secb course content slab on grades construction. Unless otherwise noted, all referenced table, figure, and equation numbers are from that article. A stepbystep design procedure is given for composite beams using various forms of precast concrete units, with or without a concrete topping. Design of waffle slab without beams by direct design method 32 32 32 c 1 c 2 c 3 c 4 2 c. Waffle slabs are preferred for spans greater than 40 feet 12 m, as they are much stronger than flat slabs, flat slabs with drop panels, twoway slabs, oneway slabs, and. Nov 27, 20 one way slab design criteria with design example according to aci code slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. L1084 32 abingdon villas page 35 of 70 pringuerjames consulting engineers ltd. To distribute flexural stresses and strains within the uhpc over a larger area. Oneway and twoway slabs university of asia pacific. Sap 2000 tutorial session notes this tutorial provides the basic steps of performing a frame analysis using sap 2000. Waffle slab requires only 70% of concrete and 80 % of steel from the concrete and steel used for stiffened raft.
Using aashto lrfd bridge design specifications 4th ed. Dhang, department of civil engineering, iit kharagpur. This gives you complete waffle slab design with rebar detailing and schedules. Fittings typically connect the tubing between the sub slab probe and the collection container usually a summa canister.
Reinforced concrete slab design using the empirical method. It has got detailed worked example of all cocncete elements, including ribbed and waffle slabs. Analysis and design of link slabs in jointless bridges with. Ce 437537, fall 2002 slabongrade example design info 1 8. Design of slab for flexure 067 m unit width of slab. The wire reinforcing institute recommends the use of the subgrade drag theory for slabs up to 150 feet in length. A reinforced concrete slab is built integrally with its supports and consists of equal span of 15 ft. To make the superstructure continuous for live load. To make the slab design independent of the type of rail, we will place the wheel load 1 from the nominal face of the rail 1ft from the edge of the slab. A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. Design of concrete structures 14th edition, 2009, by arthur h. Designing for shear in slabs including punching shear.
Beams of width and depth are provided on all column lines. The construction and design of concrete slabs on grade d. While the link slab system can provide the benefits of a continuous bridge deck, refinement of the design and detailing of the link slab itself is needed to optimize this bridge deck system and ensure longterm performance. Design the slab following the provisions of the aci code. Example on design of slab bridge design data and specifications superstructure consists of 10m slab, 36m box girder and 10m tgirder all simply supported. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Continuous one way slab figure 1 shows a clear area of 12 m x 8. Chapter 3 design of rectangular beams and oneway slabs 12.
Ce 437537, fall 2002 slab ongrade example design info 1 8 design the thickness for a slab ongrade concrete slab in a warehouse. They may be supported on two opposite sides only fig. For a moment frame, the column vertical loads are the resultants of base overturning. Leak testing prior to collecting a sub slab sample. Microsoft powerpoint ce 479 fall 05compositefloor decks. A civil engineer must know all the aspects regarding the flat floor system. Plan view of floor system assume partitions will not be damaged by deflections. Instructional materials complementing fema 451, design examples foundation design 1416 reduction of overturning moment nehrp recommended provisions allow base overturning moment to be reduced by 25% at the soilfoundation interface. This manual p rescribes the criteria for the design of concrete floor slabs on grade in buildings for heavy loads and is applicable to all elements responsible for military construction. Design of waffle slab without beams by direct design method 32 32 32 c 1 c 2 c 3 c 4 2 c 5 c 6 c 7 c 8 32 s ss 22 3 7 c 9 c 10 c 11 c 12 32 8 11 b 1210 bb c c 14 c 15 c 16 16. Therefore, the link slab design assumes that the uhpc section is subject to bending only.
The following example illustrates the design methods presented in the article timesaving design aids for reinforced concrete, part 2. The name waffle comes from the grid pattern created by the reinforcing ribs. Aci 360, design of slabsongrade, refers to this as a type b slab. Design of composite beams using precast concrete slabs. A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. This paper focuses on analysis of twoway ribbed and waffle slabs with hidden beams. Nhi course 081 load resistance factor design lrfd for highway bridge superstructures, design examples pdf, 7. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. The building is located in seismic zone iii on a site with medium soil. Introduction concrete slabs on grade are a very common type of concrete construction. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor.
Framing dead load selfweight superrimposed dead load 25 psf partitions, me, misc. This paper deals with the problem of optimum design of reinforced concrete twoway ribbed waffle slabs using genetic algorithms. Bending will take place in the two directions in a dishlike fo. A six storey building for a commercial complex has plan dimensions as shown in figure 1. Ce 479 fall 05compositefloor decks purdue engineering. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. Twoway joist concrete slab floor waffle slab system analysis and design design the concrete floor slab system shown below for an intermediate floor with partition weight of 50 psf, and unfactored live load of 100 psf. A waffle slab or twoway joist slab is a concrete slab made of reinforced concrete with concrete ribs running in two directions on its underside. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types. Two way slab design by direct design method as per aci 31811. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. Rectangular beams and oneway slabs page 5 of 9 maximum permissible steel ratio, max an overreinforced beam will fail in a brittle manner while an underreinforced beam will. Design the 4 marked slab panels of an ordinary house. As it is illustrated in the following project example, the program carries each critical feature of a floor slabs geometry to the model for an authentic analysis and design.
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