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. For analysis, the mat is divided into mutually perpendicular strips. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Flat plate concrete floor system does not use beams between columns or. However, the complexity of the generalized approach. The allowable bearing capacity for the supporting soil is 60 knm 2.
Civil engineering design of concrete structures nptel. 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. Dhang, department of civil engineering, iit kharagpur. 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. One way slab being supported on two opposite sides only leads to the structural action in single direction. These materials are originally located at different websites. Analyze and design flat slab or waffle slab floors. Comparative analysis and design of flat and grid slab system. This design is a complete flat plate slab design, from shear to bending along with design of columns and shear head reinforcement.
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. Flat plate slab is that in which slab is directly supported on columns without column capital, drop panel or beams. 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. The strip may have up to 20 spans and may have cantilevers at the ends. The beams run both ways and the columns and, located at the intersection of the beams. Design of reinforced concrete structures ii twoway slabs 1 1. Finite element fe analysis, is a popular powerful computer method of analysing flat slab concrete structures. Reinforced concrete flat slabs are commonly used in construction as they provide a number of benefits to the designer including. The benefits of choosing flat slabs include a minimum depth solution, speed of construction, flexibility in the plan layout both in terms of the shape and. Th e flat slab is often thickened closed to supporting column s to provide adequate strength in shear and to reduce th e. Flat slab seminar report, ppt, pdf for civil engineering. Lecture series on design of reinforced concrete structures by prof. The design shear force v d is below the maximum punching strength v rd,max. Nancy debora assistant professor civil karunya university 2.
Department of mechanics, materials and structures english. The design i am going to share with you today is design of flat plate slab as by definition. The design bending moments are zero at discontinuous ends, negative at continuous ends and positive at midspans. Ultimate behavior of oneway spanning slab linear elastic analysis methods such as moment distribution are linear elastic methods. 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. The slab has to carry a distributed permanent action of 1. Design of cantilever slab spreadsheet engineering books. Design of reinforced concrete structures ii twoway slabs. R it is observed that the flat slab with drop is more economical than flat slab without drop and grid slabs. Design considerations for reinforced concrete flat slab floor system harshal deshpande1, radhika joshi2. It is desired to design the raft slab shown below to support the column loads for a building as given below.
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. Flat slab analysis and design designs beamless concrete slab floors flat slab or waffle slab in accordance with aci 318. Flat slab analysis, design and detailing pdf civil engineering. 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. Analysis and design of flat slab and grid slab and their. Bm and sf coefficients for flat slab or 3 or more equal spans outer support. This paper guide us how to select drop, panel width, thickness of slab and detailing of.
The procedure of the design of oneway slab is the same as that of beams. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. These method can be used provided the limitations specified therein are satisfied. Typically design for deflection is by span to effective depth ratio 18 23. Find depth of slab using deflection control criteria. Flat slab is more flexible and economical as compare to conventional slab. This study includes complete analysis and design of flat slab as per indian code of practices is456.
Analysis and design of flat slab and grid slab and their cost. International journal of pure and applied mathematics volume. 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. A reinforced concrete flat slab also called as beam less slab, is a slab supported directly by columns wit hout beams. Design of reinforced concrete structures free video lectures. Slab with basement walls as a part of the mat figure 5. Accordingly, main reinforcement is required in the two directions.
This publication seeks to introduce fe methods, explain how concrete can be successfully modelled and how to interpret the results. The main objective of the paper is to study method of analysis and design of flat slab by using aci 318 08 design codes, with matlab programming for the easy application language for the design of flat slab. Firstly, one has to check if the design shear force v d is smaller than the maximum punching strength v rd,max. 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. Flat slabs design is appropriate for most floor situations and is also suitable for irregular column layouts, curved floor shapes, ramps etc. Different types of shear reinforcement used at column heads. Flat slab sized for punching shear and deflection additional reinforcement added to span steel to reduce deflections. 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.
Punching of flat slabs design for shear at the column heads. Flat slab design spreadsheets to eurocode excel sheets. Deflection ec2 basic span to depth ratios 12 14 16 18 20 22 24 26 28 30 32 34 36 0. Explore flat slab with free download of seminar report and ppt in pdf and doc format. Oct 04, 2017 how to build and setup a concrete foundation for garages, houses, room additions, etc part 1 duration. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Flat slab analysis and design free version download for pc. A civil engineer must know all the aspects regarding the flat floor system. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Reinforced concrete design 1 design of slab examples and.
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. Design the exterior panel of a flat slab of size 6 m. 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. Thin sections allowing for greater roof heights and lighter floors. How to design reinforced concrete flat slabs using finite. Introduction to flat slabs modelling of reinforced. The floor system is supported by columns of size 500 mm. The method is generally applicable where columns are more or less equally spaced. Introduction to spread footings and mat foundations. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. In this course, basic elements governed by bending, shear, axial forces or combination of them are identified and are considered as building blocks of the whole structure.
Comparative analysis and design of flat and grid slab. For the purposes of design, a typical flat slab panel is divided. However, there are some pitfalls to avoid, that often catch out the unwary. Reinforced concrete design 1 design of slab examples. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. Flat slab analysis, design and detailing pdf civil. 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. Module 5 lectures 17 to 19 mat foundations topics 17. Even while designing they are considered as oneslabs with cantilever fixed or continuous at supports. 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. Design methodology design methodology simplified method table 3. Flat slab and grid slab has been analyzed by staad pro.
Hi everyone, this video is all about the design of flat slab part1 as per is 456 2000 in hindi. Design considerations for reinforced concrete flat slab. Sathwane studied that the among flat slab, flat slab with drop and grid slab which is economical for the nexus point opposite to vidhan bhavan and beside nmc office. Oneway and twoway slabs university of asia pacific. Flat slabs may have drop panels at columns and columns may have capitals. Keywords flat slab with drop, flat slab without drop, grid slab, drop, column capital i. They are projections from wall face of lintel beams or floor slabs. All columns are 230 x 450mm, the grade of concrete f ck is 30 nmm 2, and the yield strength of the reinforcement f yk is 500 nmm 2. To see their result for this slab we will find the load factor.
Design of reinforced concrete structures is an introductory design course in civil engineering. Jul 02, 2010 lecture series on design of reinforced concrete structures by prof. Flat slab system is an important division of concrete floor system. 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. This publication seeks to introduce fe methods, explain how concrete can be successfully modelled and how to. International journal of pure and applied mathematics. Analyses are for a onebaywide strip using the equivalent frame analysis method of the aci code. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. How to build and setup a concrete foundation for garages, houses, room additions, etc part 1 duration. Flexible column arrangements, this is more difficult to achieve for a beamcolumn design. Analysis and design of flat slab by aci code with matlab coding. Aug 30, 2014 the design i am going to share with you today is design of flat plate slab as by definition.
Concrete slab design procedure7 design of continuous slab basics of reinforced concrete slab design slabs are generally designed on the assumption that they consists of. Flat slab sized for punching shear and deflection additional reinforcement added to span steel to reduce deflections typically 25% extra on a 7. Punching of flat slabs design for shear at th e column heads 12. Bending will take place in the two directions in a dishlike form.
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