Influence of stirrup detailing on punching shear strength of. The simplest type of twoway slab to construct is known as a flat plate. If the structure is sufficiently large, a separate drawing and reinforcing steel list is usually made for each unit. The fabric consists of reinforcing bar welded in either a square or rectangular grid. Typical detailing of reinforcements in beams and slabs. Slabs of uniform thickness bending and reinforced in two directions and supported directly by columns without beams. In some cases, transverse reinforcement is placed, to ensure horizontal shear transfer. Able to carry heavier loads and span longer than ribbed slabs. Detailing of individual types of members are included in the respective sections for the types, though the section in the manual includes certain aspects in detailing which are common to all types of members. 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.
Oneway and twoway slabs oneway slabs transfer the imposed. Nmh aci sp42 1974 moment transfer with shearheads w. Apr 01, 20 reinforcement disposition in test slabs 5 and 6. The institution of structural engineers the institution of civil engineers march 2000 manual for the design of reinforced concrete building structures to ec2. Aug 30, 2014 this design is a complete flat plate slab design, from shear to bending along with design of columns and shear head reinforcement. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. It has to carry a live load of 4 knm2 and a finishing load of 1 knm2. Department of mechanics, materials and structures english. Nmh aci sp30 1971moment and shear transfer to columnsw. Finally, the application of bonded reinforced concrete overlay brco on the slab s top, allows for both flexural and punching. Asw area of shear reinforcement in each perimeter around the col. The top surface of the flat slab is roughened to transfer horizontal shear. Reinforced concrete design 1 design of slab examples.
Rectangular or square column circular pattern a arranging studs. Keywords flat slabs, flat plate floors, is codes, post tensioned slabs. Reinforcement calculation detailing beams beam 2 case 1 beam b case 3 slabs slab ab12 case 1 columns column b2 case 2. Slabcolumn sub assemblages, modelled after a reinforced concrete flat plate. Atr crosssectional area of the transverse reinforcement along the development length lsy. Flat slabs are mostly used in large industrial structures, parking garages, ramps, warehouse, high rise buildings and hotels. Automatic welding machines ensure that the grid of bars has consistent. Flat slab analysis, design and detailing pdf civil engineering. The reinforcement for the column strip was design for the direction from easttowest only. Shear reinforcement using vertical stirrups in integral beams avoids much of this difficulty. Design considerations for reinforced concrete flat slab. All the specification is like beam reinforcement and other detailing is given below. Architectural engineering senior thesis washington park condominiums final.
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 in one direction ns. Pdf design of reinforced concrete flat slab with drop panel. Manual for the design of reinforced concrete building. Oct 20, 20 testing and analysis of flat plate and flat slab system shear strengths aci journal sept. Flat slab analysis, design and detailing pdf civil. The linkstudpsr system comprises short lengths of carbon steel deformed bar. The reinforcing steel list may be subdivided similarly. The column tends to punch through the slab in flat slabs, which can be treated by three methods. Influence of stirrup detailing on punching shear strength. Twoway joist concrete slab floor waffle slab system. Internal and edge panels design of flat slabs 409 column strip half. Pdf optimum design of a reinforced concrete ribbed slab. Flat slab bridges consist of prestressed, precast concrete deck panels that span from bent to bent.
Pdf a comparative study of flat slabs using different shear. C detail of the reinforcement stirrups and load application column in plane view the first row of transverse reinforcement is placed at a distance of10 cm. Slab design part of 10storied building design course. The slab has to carry a distributed permanent action of 1. Design considerations for reinforced concrete flat slab floor. Using a drop panel without a column capital in flat. The slab is without drops and is supported internally and on the external long sides by square columns. A rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3.
Features of the design this flat plate slab design is hand written involving each step by step detailed calculation with drawings and detailing. Pdf design and detailing of reinforced concrete maro mark. The bond strength is taken as f bd 3 mpa according to mc 2010 for corrugated bars. Reinforcing steel for larger structures is sometimes detailed, fabricated, and delivered by units, for example, footings, abutments, piers, and girders.
This educational solved example for the design of reinforced concrete flat slab with drop panel, and check for punching shear. Detailing solid slabs flat slab design includes flexure worked example exercise punching shear. In the past, several investigations took place but no theory so far could describe the punching shear behavior of flat slabs with shear. Colum strip 2 ast cdumn 16 ast two thirds of the negative support reinforcement in the column strip should be placed in half the width of the column strip centred over the column. Pdf design of reinforced concrete flat slab with drop. Reinforcement detailing of simple beams and slabs 1. The 20mm pvc render mould section is applied to the joint by external coating. Joint is taped and set with external water proofing membrane by external coating applicator refer to detail i2. Direct design method ddm for slab systems with or without beams loaded only. Guide to the design and construction of reinforced concrete. Reinforcement calculation detailing beams beam 2 case 1 beam b case 3 slabs. Manual for design and detailing of reinforced concrete to. Maximum shear reinforcement in the form of stirrups shall be provided such thata sv bs v 0. Reinforcement detailing beam, slab, column akstudysource.
The wire reinforcing institute recommends the use of the subgrade drag theory for slabs up to 150 feet in length. Flat slab types, uses, advantages and disadvantages. Reinforced concrete design 1 design of slab examples and. These slabs are supported directly by the columns and have a completely flat soffit. A civil engineer must know all the aspects regarding the flat floor system. Therefore, the slab can be reinforced with shear reinforcement complying with detailing rules defined in subclause 7. In the past, several investigations took place but no theory so far could describe the punching shear behavior of flat slabs with shear reinforcement satisfactorily. Anchorage and lap splicing detailing of slabs, columns. Flat slab system is an important division of concrete floor system. Pdf design and detailing of reinforced concrete maro. Aci 360, design of slabs ongrade, refers to this as a type b slab. For a roof to be effective, surface water should be. Anchorage and lap splicing detailing of slabs, columns, beams.
Reinforcement detail may be shown as was done in previous problem. They are also used where uses of beams are not required. Reinforcing mesh mesh is manufactured in flat sheets with bars up to 12 mm diameter, or rolls for fabric with bars up to 5 mm diameter. Mar 23, 2015 as span is same in both directions, provide similar reinforcement in both directions. Slab reinforced with top ushaped hairpin top longitudinal reinforcement bars as well as transverse bars.
Sep 09, 2011 sk 911 detailing of reinforcement in flat slabs. A flat slab consists of a reinforced concrete slab that is directly supported by concrete columns. A flat plate floor system is a twoway concrete slab of uniform depth without interior beams, drop panels or column capitals supported directly on columns with reinforcement in two orthogonal directions. Ec2 webinar autumn 2016 lecture 52 designing for shear in slabs when shear reinforcement is not required e. The design of flat slabs at ultimate is mainly governed by the detailing of the slab column.
For a roof to be effective, surface water should be discharged quickly without ponding or stagnation. Pdf punching shear failure is a brittle failure and it is one of the most important types of failure to be considered while. Reinforcement calculation for circular slab civil planets. The results showed that the optimum ratio of effective depth span length are within the ranges 9127 for flat slabs without edge beams, 143 for flat slabs with edge beams. Manual for design and detailing of reinforced concrete to the september 20. Manual for design and detailing of reinforced concrete to the. In reinforcedconcrete buildings, slabs are used to provide flat. Dissemination of information for training brussels, 2021 october 2011 25 eurocode 2. Guide to the design and construction of reinforced.
Where, a sv total crosssectional area of stirrup legs effective in shear. The investigations about this technique applied to reinforced concrete flat slabs are essentially due to fernandes et al. The flat slab is a twoway reinforced concrete slab that usually does not have beams and girders, and the loads are transferred directly to the supporting concrete columns. The panels act as permanent forms for a castinplace deck. A flat slab may be solid slab or may have recesses formed on the soffit so that the sof fit comprises a series of ribs in two directions. For flat plate slab system, the minimum slab thickness per aci 31814 are. The flat slab is a twoway reinforced concrete slab that usually does not have beams and girders, and the loads are transferred directly to the supporting concrete columns the column tends to punch through the slab in flat slabs, which can be treated by three methods using a drop panel and a column capital in flat slab. Detailing lecture 9 16 th november 2017 reinforced concrete detailing to eurocode 2 ec2 section 8 detailing of reinforcement general rules bar spacing, minimum bend diameter anchorage of reinforcement lapping of bars large bars, bundled bars ec2 section 9 detailing of members and particular rules beams solid slabs flat slabs columns walls. Request pdf influence of stirrup detailing on punching shear strength of flat slabs most concrete design codes agree that it is important for punching shear reinforcement stirrups in slabs to. As seen in figure1 below, for a simply supported beam and slab, 100% reinforcement as per the design is provided as tension reinforcement at the mid span of the beam and slab, and 50% is curtailed at the distance of 0. Reinforcement details of simply supported beam and slab.
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