The results of the study show that the slab can be successfully used for residential buildings as it meets all the requirements and demands fewer materials. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Civil engineering design of reinforced concrete structures nptel. A flat plate floor is a twoway slab with no supporting beams, only columns. Introduction to spread footings and mat foundations. Different types of shear reinforcement used at column heads. Nptel video lectures, iit video lectures online, nptel youtube lectures. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. A reinforced concrete flat slab also called as beam less slab, is a slab supported directly by columns wit hout beams. Effective depth d span ldbasic x modification factor for obtaining modification factor, the percentage of steel for slab can be assumed from 0. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. A reinforced concrete slab is built integrally with its supports and consists of equal span of 15 ft.
Nptel provides elearning through online web and video courses various streams. International journal of pure and applied mathematics. How to design reinforced concrete flat slabs using finite. The procedure of the design of oneway slab is the same as that of beams. Reinforced concrete design 1 design of slab examples. Flat slab system is an important division of concrete floor system. Civil engineering design of concrete structures nptel. Flat slab analysis, design and detailing pdf civil. Lecture series on design of reinforced concrete structures by prof. 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. Tranquility studies and allowable vessel motion 26. This example is for the design of a reinforced concrete flat slab without column heads. A column strip is defined as a strip of slab having a width on. Dhang, department of civil engineering, iit kharagpur.
Analyses are for a onebaywide strip using the equivalent frame analysis method of the aci code. This design is a complete flat plate slab design, from shear to bending along with design of columns and shear head reinforcement. Twoway 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. Punching of flat slabs design for shear at th e column heads 12. The distribution of dead load of slab, wearing course etc.
For analysis, the mat is divided into mutually perpendicular strips. Also explore the seminar topics paper on flat slab with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year civil engineering ce or ieee civil construction btech, be, mtech students for the year 2015 2016. Department of mechanics, materials and structures english. Analyze and design flat slab or waffle slab floors.
Analysis and design of flat slab by aci code with matlab. The beams run both ways and the columns and, located at the intersection of the beams. Flat slab sized for punching shear and deflection additional reinforcement added to span steel to reduce deflections typically 25% extra on a 7. Flat slab is more flexible and economical as compare to conventional slab. However, the complexity of the generalized approach. To see their result for this slab we will find the load factor. Th e flat slab is often thickened closed to supporting column s to provide adequate strength in shear and to reduce th e. Foreword the reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. For this slab, panel a has two discontinuous exterior edges and two continuous interior edges, panel b has one discontinuous and three continuous edges, while the interior panel c has all edges continuous. Oneway and twoway slabs university of asia pacific.
These method can be used provided the limitations specified therein are satisfied. Flat plate slab is that in which slab is directly supported on columns without column capital, drop panel or beams. This paper guide us how to select drop, panel width, thickness of slab and detailing of reinforcement. Design of reinforced concrete structures is an introductory design course in civil engineering. The slab is part of a larger floor plate and is taken from guide to the design and construction of reinforced concrete flat slabs29\ where finite element analysis and design to eurocode 2 is illustrated. Punching of flat slabs design for shear at the column heads. Flat slabs may have drop panels at columns and columns may have capitals. According to the 1995 aci code, all twoway reinforced concrete slab systems, including edge supported slabs, flat slabs, and flat plates, are to be analyzed and designed according to one unified method, such as direct design method and equivalent frame method. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3.
The analysis and design follow the equivalent frame analysis method of the aci code, which considers a onebay wide strip of the floor system as a continuous frame. Even while designing they are considered as oneslabs with cantilever fixed or continuous at supports. These materials are originally located at different websites. Analysis of flat sanalysis of flat sllabab column head l ho l h max l c d h i l h l h, max l ho l h max l c d h ii l h l ho effective dimension of a head, where l ho actual dimension, l.
Flat slab seminar report, ppt, pdf for civil engineering. Flat slab flat slab are also known as beamless slab, is a type of slab in which the flooring slab is directly supported on columns without the agency of beam or girders. Design of slabtwo way excel sheet online civilforum. This study includes complete analysis and design of flat slab as per indian code of practices is456.
Module 5 lectures 17 to 19 mat foundations topics 17. Design of reinforced concrete structures free video lectures. However, there are some pitfalls to avoid, that often catch out the unwary. Effective flange width shall be the least of the following. For the purposes of design, a typical flat slab panel is divided into column strips and middle strips. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Design for punching shear and design of beams and slab 25. Nancy debora assistant professor civil karunya university 2. This publication seeks to introduce fe methods, explain how concrete can be successfully modelled and how to interpret the results. A civil engineer must know all the aspects regarding the flat floor system.
Ultimate behavior of oneway spanning slab linear elastic analysis methods such as moment distribution are linear elastic methods. Bending will take place in the two directions in a dishlike form. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. They are projections from wall face of lintel beams or floor slabs. Accordingly, main reinforcement is required in the two directions. 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. How to build and setup a concrete foundation for garages, houses, room additions, etc part 1 duration. Flat slab analysis and design designs beamless concrete slab floors flat slab or waffle slab in accordance with aci 318. The design bending moments are zero at discontinuous ends, negative at continuous ends and positive at midspans.
As with the guide, grid line c will be designed but, for the sake of illustration, coefficients will be. Design of reinforced concrete structures nptel online. Design of flat slab with edge beams by direct design method 16 14 14 3 b c 1 c 2 c 3 c 4 3 1 c 5 c 6 c 7 c 8 c 9 14 c 10 11 c c 12 c c 14 c 15 c 16 8 c 17 c 18 c 19 c 20 8. Finite element fe analysis, is a popular powerful computer method of analysing flat slab concrete structures. The slab has to carry a distributed permanent action of 1. Flat slab analysis and design free version download for pc. Analysis and design of flat slab and grid slab and their. The method is generally applicable where columns are more or less equally spaced. The specified design strength of the concrete, is 25 mpa and the specified yield strength of the reinforcement, fy, is 400 mpa. The unit weight of reinforced concrete is assumed to be 24 knm3. Oneway and twoway slabs oneway slabs transfer the imposed. Comparative analysis and design of flat and grid slab. Slab with basement walls as a part of the mat figure 5. Design of cantilever slab spreadsheet engineering books.
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