The slab is for an offi ce where the specifi ed load is 1. A civil engineer must know all the aspects regarding the flat floor system. Flat slab is a reinforced concrete slab supported directly by concrete columns without. Pdf irregular flat slabs designed according to the structural. The reinforced design manual concrete in accordance with aci 31811. Reinforcement details in beams and slabs beam reinforcement details. The depth of the drop panel is 250 mm and the slab depth. Twoway concrete slabs with openings the static system and the design of reinforcement.
A rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Calculate additional slab reinforcement at columns for moment. Introduction, definitions flat slabs are twoway slabs supported by pointlike supports. A reinforced concrete flat slab floor is a significant advancement in the building technology. Provide reinforcement according to the calculated moments after performing moment. For an internal panel, twothirds of the amount of reinforcement required to resist. Aci 318 emphasizes the importance of anchorage details and accurate placement of the shear. 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. 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. Example 1 the floor of a building constructed of flat slabs is 30. A total of seven largescale flat plate slabs 1,700 x 1,700 x 150 mm were.
A flat slab consists of a reinforced concrete slab that is. See references 5, 11, and through 18 for slab shear reinforcement. The main objective of the study is to study method of analysis and. The slab has to carry a distributed permanent action of 1. Reinforced concrete sloped roof slab overhang detail section detail of a reinforced concrete sloped inclined slab overhang cantilever detail, supported from a concrete beam. Although not included in astm c478, plants may use astm a706 reinforcing steel when welding reinforcing mats. Ec2 webinar autumn 2017 lecture 52 designing for shear in slabs when shear reinforcement is not required e. A detailed explanation will be given of the checksto be carried out, the aspects to be. Twoway flat plate concrete floor system design structurepoint. Flat slab types of flat slab design and its advantages. The depth of the drop panel is 250 mm and the slab depth is 200 mm. Slab may be supported on walls or beams or columns.
To optimise the slab thickness, consider all factors such as the method of. Usually placed around slab openings where regular beam downstand is not architecturally preferred. Jan 11, 2017 reinforcement detailing of a slab is done based on its support conditions. In flat plate floors, slab column connections are subjected. Design of reinforced concrete structures ii twoway slabs. Slab reinforcement and beam reinforcement details daily. The materials to be used are grade c25 concrete and grade 500 reinforcement. Details of slab reinforcement on the basis of bar bending schedule.
A flat slab is a reinforced concrete slab supported directly by concrete columns without the use of beams. The lateral loads are independently resisted by shear walls. Oneway and twoway slabs university of asia pacific. A part of slab bounded on each of the four sides by centre line of column is called a panel. Guide to the design and construction of reinforced. One way slab reinforcement details daily civil engineering.
Also, experimental details of the nine flat slab panels, supported on. Slab hidden beam reinforcement cross section detail. Rationalisation is the elimination of redundant variation. This system is similar to the twoway flat plate system except there is a drop panel to provide extra thickness around the columns. Flat slab is a reinforced concrete slab supported directly by concrete columns without the use of beams. Bar bending schedule plays a vital role in finding the quantities of reinforcement in structure.
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 plate reinforce concrete slab design architectural engineering senior thesis washington park condominiums final report mt. They may be supported on two opposite sides only fig. Reinforcement conventional reinforcing steel typically used in base slabs and flat slab tops. Slabs are constructed to provide flat surfaces, usually horizontal, in building floors, roofs, bridges, and other types of structures. Slab supported on two sides and bending takes place predominantly in one direction only is called one way slab. 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. Design considerations for reinforced concrete flat slab. Flat slab analysis, design and detailing pdf civil. The flat slab is often thickened closed to supporting columns to provide adequate strength in shear and to reduce the amount of negative reinforcement. Concrete slabs are commonly divided into the following types. Reinforcement details in one way slab before starting one way slab reinforcement let me clear what is one way slab.
The slab is 300 mm thick and columns are 400 mm square. Rationalisation of reinforcement, design and installation processes are considered. Placement of reinforcement in the slab section designed in flexure example 4. In this post, we are going to explain how to calculate steel quantity for the slab. Cantilever longitudinal and transverse reinforcement bars, supporting beam reinforcement details, adjucent slab top bottom reinforcement. The rest of the floor can be slightly thinner with less dead weight.
Structural design of flat slabs to eurocode 2 structville. If column heads are regarded as essential, detail them to be cast as part of the column to allow the advantages of flat soffits for the. The slab may be supported by walls, by reinforced concrete beams usually cast monolithically with the slab, by structural steel beams, by columns, or by the ground slabs are classified into two types. The linkstudpsr system comprises short lengths of carbon steel deformed bar reinforcement with end anchorages provided by enlarged, hot forged heads at both ends, giving a crosssectional area ratio of 9. Beamless slabs beamless slabs are supported only on columns and are applied mostly in large industrial and. Different types of shear reinforcement used at column heads. Reinforced flat slab design excel sheet best online. The committee is continuing study of these aspects of connection design.
Manual for design and detailing of reinforced concrete to. Bending will take place in the two directions in a dishlike form. Reinforcement detailing of reinforced concrete slabs. The general criteria used for the design, such as details of material properties are given in a separate report entitled structural design criteria. Punching of flat slabs design for shear at the column heads. A flat plate system will be considered first to illustrate the impact longer spans and heavier applied loads. Structure student of icoer, university pune, india 2assistant professor of civil engineering department icoer, university pune, india abstract. Flat plate concrete floor system does not use beams between columns or. Department of mechanics, materials and structures english. 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. Flat slabs are slabs that are supported directly by columns without floor beams. Beams are essentially provided with main reinforcement on the tension side for flexure and transverse reinforcement.
When a slab is supported on the two different sides and the ratio of longer span to shorter span is equal to or greater than 2, it will be considered as one way slab. Flat slab analysis, design and detailing pdf civil engineering. Flat slabs can offer economical solutions to wider floor spans in a reinforced concrete building. Flat slab seminar report, ppt, pdf for civil engineering. Determination of perimeter shear strength at an interior column supporting a flat slab. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. Design of reinforced concrete structures ii twoway slabs 1 1. In flat plate floors, slab column connections are subjected to high shear stresses produced by the transfer of axial loads and bending moments between slab and columns. There are many advantages of flat slab such as increased head room, easier flow of mechanical and electrical services. The flat slab system is a special structural form of reinforced concrete construction that.
Slab supported on two sides and bending takes place predominantly in one direction only is called one. Flat slab analysis, design and detailing pdf flat slab system is an important division of concrete floor system. This report presents the structural engineering calculations of a posttensioned flat slab supported on columns, using hong kong building code hkcop 2004 and its amendment of june 2007. Department of mechanics, materials and structures english courses reinforced concrete structures code. The thickness of the slab has to be increased or the slab has to be shear reinforced. Technical thestructuralengineer 35 technical guidance note. Shear reinforcement to check if shear reinforcement and which system can be used, one can. Relevant information on these subjects can be found in the literature. Rationalised reinforcement in the insitu concrete building at cardington this guide provides recommendations for the efficient and economic reinforcement of concrete flat slabs. Panel may be divided into column strip and middle strip. Reinforced concrete design 1 design of slab examples. Reinforcement detailing of a slab is done based on its support conditions. Slab supported directly by columns are called flat slab.
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