Bar bending schedule plays a vital role in finding the quantities of reinforcement in structure. Relevant information on these subjects can be found in the literature. Twoway joist concrete slab floor waffle slab system. Beams are essentially provided with main reinforcement on the tension side for flexure and transverse reinforcement. The committee is continuing study of these aspects of connection design.
The rest of the floor can be slightly thinner with less dead weight. Flat plate concrete floor system does not use beams between columns or. Department of mechanics, materials and structures english courses reinforced concrete structures code. Design of reinforced concrete structures ii twoway slabs 1 1.
A reinforced concrete flat slab floor is a significant advancement in the building technology. Design considerations for reinforced concrete flat slab. Flat slab is a reinforced concrete slab supported directly by concrete columns without. It has been observed that possible failure mode of the reinforced concrete flat slabs is punching that occurs in the vicinity of a column. The reinforced design manual concrete in accordance with aci 31811. Aci 318 emphasizes the importance of anchorage details and accurate placement of the shear. Reinforced flat slab design excel sheet best online. Although not included in astm c478, plants may use astm a706 reinforcing steel when welding reinforcing mats. Slab supported on two sides and bending takes place predominantly in one direction only is called one way slab. Design of reinforced concrete structures ii twoway slabs. Rationalisation of reinforcement, design and installation processes are considered.
This system is similar to the twoway flat plate system except there is a drop panel to provide extra thickness around the columns. Details of slab reinforcement on the basis of bar bending schedule. Introduction, definitions flat slabs are twoway slabs supported by pointlike supports. Different types of shear reinforcement used at column heads. Reinforced concrete sloped roof slab overhang detail section detail of a reinforced concrete sloped inclined slab overhang cantilever detail, supported from a concrete beam. Ec2 webinar autumn 2017 lecture 52 designing for shear in slabs when shear reinforcement is not required e.
In this post, we are going to explain how to calculate steel quantity for the slab. A detailed explanation will be given of the checksto be carried out, the aspects to be. A total of seven largescale flat plate slabs 1,700 x 1,700 x 150 mm were. Reinforcement details in beams and slabs beam reinforcement details. Flat slab is a reinforced concrete slab supported directly by concrete columns without the use of beams.
A flat plate system will be considered first to illustrate the impact longer spans and heavier applied loads. Twoway concrete slabs with openings the static system and the design of reinforcement. Jan 11, 2017 reinforcement detailing of a slab is done based on its support conditions. For an internal panel, twothirds of the amount of reinforcement required to resist. Slabs are constructed to provide flat surfaces, usually horizontal, in building floors, roofs, bridges, and other types of structures.
Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. 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. Oneway and twoway slabs university of asia pacific. One way slab reinforcement details daily civil engineering.
Example 1 the floor of a building constructed of flat slabs is 30. Beamless slabs beamless slabs are supported only on columns and are applied mostly in large industrial and. Rationalisation is the elimination of redundant variation. Slab reinforcement and beam reinforcement details daily. A civil engineer must know all the aspects regarding the flat floor system. 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 thickness of the slab has to be increased or the slab has to be shear reinforced. Reinforcement conventional reinforcing steel typically used in base slabs and flat slab tops. Shear reinforcement to check if shear reinforcement and which system can be used, one can. Determination of perimeter shear strength at an interior column supporting a flat slab. Reinforcement details in one way slab before starting one way slab reinforcement let me clear what is one way slab. 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. Structural design of flat slabs to eurocode 2 structville.
Flat slab seminar report, ppt, pdf for civil engineering. Provide reinforcement according to the calculated moments after performing moment. Concrete slabs are commonly divided into the following types. The slab has to carry a distributed permanent action of 1. Calculate additional slab reinforcement at columns for moment.
Panel may be divided into column strip and middle strip. Guide to the design and construction of reinforced. 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. A part of slab bounded on each of the four sides by centre line of column is called a panel. Usually placed around slab openings where regular beam downstand is not architecturally preferred. 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. Pdf irregular flat slabs designed according to the structural. A rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3.
The flat slab is often thickened closed to supporting columns to provide adequate strength in shear and to reduce the amount of negative reinforcement. Cantilever longitudinal and transverse reinforcement bars, supporting beam reinforcement details, adjucent slab top bottom reinforcement. Reinforcement detailing of reinforced concrete slabs. Flat slab types of flat slab design and its advantages.
A flat slab is a reinforced concrete slab supported directly by concrete columns without the use of beams. Punching of flat slabs design for shear at the column heads. Flat slabs can offer economical solutions to wider floor spans in a reinforced concrete building. 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. The depth of the drop panel is 250 mm and the slab depth. Flat slab analysis, design and detailing pdf civil engineering. In flat plate floors, slab column connections are subjected. Also, experimental details of the nine flat slab panels, supported on. A flat slab consists of a reinforced concrete slab that is.
The slab is 300 mm thick and columns are 400 mm square. See references 5, 11, and through 18 for slab shear reinforcement. Rationalised reinforcement in the insitu concrete building at cardington this guide provides recommendations for the efficient and economic reinforcement of concrete flat slabs. The slab is for an offi ce where the specifi ed load is 1. The lateral loads are independently resisted by shear walls. Structure student of icoer, university pune, india 2assistant professor of civil engineering department icoer, university pune, india abstract. The general criteria used for the design, such as details of material properties are given in a separate report entitled structural design criteria. Reinforced concrete design 1 design of slab examples. 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.
The flat slab system is a special structural form of reinforced concrete construction that. 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. Slab supported on two sides and bending takes place predominantly in one direction only is called one. Slab supported directly by columns are called flat slab. The materials to be used are grade c25 concrete and grade 500 reinforcement. In order to find out the bar bending schedule for slab or steel reinforcement in slab, i recommend you to learn basics of bar bending schedule and how to adopt concrete cover for different components of a building. Manual for design and detailing of reinforced concrete to.
The depth of the drop panel is 250 mm and the slab depth is 200 mm. Slab hidden beam reinforcement cross section detail. 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. Reinforcement detailing of a slab is done based on its support conditions. Slab may be supported on walls or beams or columns. To optimise the slab thickness, consider all factors such as the method of. The main objective of the study is to study method of analysis and. They may be supported on two opposite sides only fig. Placement of reinforcement in the slab section designed in flexure example 4. Manual for design and detailing of reinforced concrete to september 20 the code of practice for structural use of concrete 20 contents 1. 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. Twoway flat plate concrete floor system design structurepoint. Flat slab analysis, design and detailing pdf civil.
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