Pdf optimum design of reinforced concrete flat slabs. There are many advantages of flat slab such as increased head room, easier flow of mechanical and electrical services. This publication seeks to introduce fe methods, explain how concrete can be successfully modelled and how to. Pdf design of reinforced concrete flat slab with drop. Nancy debora assistant professor civil karunya university 2. Guide to the design and construction of reinforced. Design methodology analysis of flat slab detailing. Oct 05, 2019 flat slab system is an important division of concrete floor system. Flat plate slab is that in which slab is directly supported on columns without column capital, drop panel or beams.
Design examples 84 the following style is used when referring to a section of aci 318 for which a change or insertion is proposed by the provisions. Flat slab for short span lengths and light distributed weight e. Explore flat slab with free download of seminar report and ppt in pdf and doc format. The intention is to design the slab spanning between the perimeter columns and the central core walls as a flat slab, ie without any drops for beams.
The slab is for an offi ce where the specifi ed load is 1. Asce, secb course content slab on grades construction. Analysis of flat sanalysis of flat sllabab moment division example 6000 6000 6000 6000 6000 5000 layout of building 7000 5000 a floor slab in a building where stability is provided by shear walls. Flat plate concrete floor system does not use beams between columns or. Design of reinforced concrete structures ii twoway slabs 1 1. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Design of slab for flexure 067 m unit width of slab. The spacing between the perimeter columns and the core varies between 7 and 9 meters, so we are also contemplating the option of having a posttensioned system, but this is perhaps irrelvant for. Flat slab design pdf design of two way slab example pdf bs 8110 concrete design for slab flat plate design beam and slab bridge uk slab on grade foundation post tension slab beam and slab bridge how to calculate formwork for slab how to pour a concrete slab concrete beam and slab bridge how to pour a 26x36 concrwte concrete. Aug 30, 2014 the design i am going to share with you today is design of flat plate slab as by definition. The selfweight of the completed concrete slabs is generally assumed in backpropping calculations to be based on a density of 24 knm. In flatplate floors, slabcolumn connections are subjected to high shear stresses produced by the transfer of axial loads and bending moments between slab and columns.
Generalnsideration co s for use of flat slab floor system the following are the main factors to be considered before adopting the use of the concrete flat plate with steel concrete column system. Steelreinforced slabs, typically between 100 and 500 mm thick, are most often used to construct floors and ceilings, while thinner mud slabs may be used for exterior paving see below. A flat slab is a reinforced concrete slab supported directly by concrete columns without the use of beams. Flat plate reinforce concrete slab design architectural engineering senior thesis washington park condominiums final report mt. 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. This educational solved example for the design of reinforced concrete flat slab with drop panel, and check for punching shear. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. The construction and design of concrete slabs on grade.
Reinforced concrete design 1 design of slab examples and. Design the concrete floor slab system shown below for an intermediate floor considering partition weight 20 psf, and unfactored live load 60. Introduction flat slab flat slab with drop panels flat slab with column head flat slab with drop panel and column head. Accordingly, main reinforcement is required in the two directions. Design considerations for reinforced concrete flat slab floor. The depth of a concrete slab floor is very small compared to its span. When zd is determined, the prestressing force required to balance an. Design of reinforced concrete flat slab with drop panel. Analyze and design flat slab or waffle slab floors. Introduction concrete slabs on grade are a very common type of concrete construction.
Pdf cost optimisation of reinforced concrete flat slab. Aug 27, 2015 guide to the design and construction of reinforced concrete flat slabs contents membersof the projectsteeringgroup list of tables vii iv list of figures v 1. A slab strip of unit width is analysed using simple beam theory. This publication seeks to introduce fe methods, explain how concrete can be successfully modelled and how to interpret the results. Concrete slab, a very common and important structural element, are constructed to provide flat, useful surfaces.
Cost optimisation of reinforced concrete flat slab buildings according to the british code of practice bs8110 is presented. Structural design of flat slabs to eurocode 2 structville. 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 lateral loads are independently resisted by shear walls. Bending will take place in the two directions in a dishlike form. Twoway flat slab concrete floor with drop panels structurepoint. Types of flat slabs, its design and advantages described. 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. Flat slab design pdf design of two way slab example pdf bs 8110 concrete design for slab flat plate design beam and slab bridge uk slab on grade foundation post tension slab beam and slab bridge how to calculate formwork for slab how to pour a concrete slab concrete beam and slab bridge how to pour a 26x36 concrwte concrete slab operation. The benefits of using insitu concrete flat slab construction should be. Flat slab is defined as one sided or twosided support system with sheer load of the slab being concentrated on the supporting columns and a square slab called drop panels.
Concrete slabs are often carried directly by columns without the use of beams or girders. Guide to the design and construction of reinforced concrete flat slabs contents membersof the projectsteeringgroup list of tables vii iv list of figures v 1. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Designing for shear in slabs including punching shear. This design is a complete flat plate slab design, from shear to bending along with design of columns and shear head reinforcement.
Oneway slabs normally design as a beam with cables running in the direction of the span at uniform centres. The benefits associated with flat slab construction may well outweigh those of other structural solutions, which could be more complicated, timeconsuming and ultimately more costly. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. It was found that a certain amount of poor design was prevalent, and the. Reinforced concrete design 1 design of slab examples. The slab has to carry a distributed permanent action of 1. In many domestic and industrial buildings, a thick concrete slab supported on. Flat slab is a reinforced concrete slab supported directly by concrete columns without the use of beams. How to design reinforced concrete flat slabs using finite.
Reinforced concrete flat slab structural engineering. The design i am going to share with you today is design of flat plate slab as by definition. Find the following parameters for design moments in step 2 per unit width step 4 note. Department of mechanics, materials and structures english. The reinforcement for the column strip was design for the direction from easttowest only. The cost function represents the cost of concrete, steel reinforcement, and formwork. Blast design procedure for flat slab structures dtic. Oct 04, 2017 how to build and setup a concrete foundation for garages, houses, room additions, etc part 1 duration. 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. The slab is 300 mm thick and columns are 400 mm square.
When placing the new slab, the falsework and the backpropping should be designed for the new concrete, being wet, using a. Flat slab analysis, design and detailing pdf civil. The benefits of using insitu concrete flat slab construction should be investigated at the conceptual design stage. It is a horizontal structural component, with top and bottom surfaces parallel or near so. Guide to the design and construction of reinforced concrete. Design of reinforced concrete structures ii twoway slabs. Optimum design of reinforced concrete flat slab with drop. For the purposes of design, a typical flat slab panel is divided.
Flat plate concrete floor system does not use beams between columns or drop panels and it is usually suited for lightly loaded floors with short. The gravity loads of the slabs are directly transferred to the columns. The construction and design of concrete slabs on grade d. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Precast concrete design 85 for seismic design categories c through f, standard section 12. Flat slab seminar report, ppt, pdf for civil engineering. A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. In any span, the max cable sag, zd depends on the concrete cover requirements and the tendon dimensions. The strip may have up to 20 spans and may have cantilevers at the ends. Flat slab system is an important division of concrete floor system.
Flat slab types of flat slab design and its advantages. Flat slab is a reinforced concrete slab supported directly by concrete columns. Finite element fe analysis, is a popular powerful computer method of analysing flat slab concrete structures. These materials are originally located at different websites. Flat slab sized for punching shear and deflection additional reinforcement added to span steel to reduce deflections typically 25% extra on a 7. Reinforced concrete sk 33 section through slab showing stress due to moment. Sep 03, 2011 reinforced concrete sk 33 section through slab showing stress due to moment. When placing the new slab, the falsework and the backpropping should be designed for the new concrete, being wet, using a density of 25 knm. Flat slab analysis, design and detailing pdf civil engineering.
Slabs may be supported on two sides only or have beams on all four sides. 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 slabs may have drop panels at columns and columns may have capitals. Reinforced flat slab design excel sheet engineering books. Flat slabs are slabs that are supported directly by columns without floor beams. It is intended for use by designers both of the permanent and temporary works who already have basic understanding of structural behaviour. Flat slab analysis and design designs beamless concrete slab floors flat slab or waffle slab in accordance with aci 318. Introduction, definitions flat slabs are twoway slabs supported by pointlike supports. Structural concrete structures reinforced concrete construction. There is a risk for punching in industrial structures, where heavy loads may be the case, flat slabs may be used. If frame analyses are performed to check the flexural resistance of a slab, the design moment, m ed transferred from the slab to a column and the design shear, v ed are obtained from the relevant analysis. Oneway and twoway slabs oneway slabs transfer the imposed.
Generalnsideration co s for use of flat slab floor system the following are the main factors to be considered before adopting the use of the concrete flat plate with steelconcrete column system. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Bs 8110 concrete design for slab how to pour a concrete slab concrete beam and slab bridge how to pour a 26x36 concrwte concrete slab design of two way slab example pdf flat slab design pdf design of steeltoconcrete joints design manual concrete design mix concrete design design concrete csa a23. However, there are some pitfalls to avoid, that often catch out the unwary.
Analyses are for a onebaywide strip using the equivalent frame analysis method of the aci code. The materials are grade 30 concrete and grade 250 reinforcement. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Keywordsflat slab, reinforced concrete, structural optimization, punching shear stress, slab size, drop panel size. Flat slab analysis and design free version download for pc. Pdf design of reinforced concrete flat slab with drop panel. Drop panels play a significant role here as they augment the. Twoway flat plate concrete floor system design structurepoint. Flat slabs can offer economical solutions to wider floor spans in a reinforced concrete building. In this video etabs2016concrete floor slab design, we show you how to design concrete floor slab in csi etabs 2016, in this video will detail you about the.
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