Introduction to flat slabs modelling of reinforced concrete. The thickness of the slab has to be increased or the slab has to be shear reinforced. Shear reinforcement to check if shear reinforcement and which system can be used, one can calculate the minimal needed value of factor k sys. Department of mechanics, materials and structures english. Reinforced concrete slab design and detailing guide is456. Thin sections allowing for greater roof heights and lighter floors. A civil engineer must know all the aspects regarding the flat floor system. Pci manual for the design of hollow core slabs second edition by donald r. C 5 is the slope correction coefficient co is the consolidation correction coefficient as an example. Draw panel of slab and indicate maximum design moments, shears and in plane loads, if any, per unit width of slab.
Design beams if any, using procedures you learned in civl. Flat slabs for efficient concrete construction construct concrete. Flat slab is a reinforced concrete slab supported directly by concrete columns without the use of beams. Analysis and design of flat slabs in commercial building. Twoway joist concrete slab floor waffle slab system analysis and design 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. As with the green book the scope of the manualcovers the majority of concrete building structures and has now been extended to cover slender columns and prestressed concrete. Report bygdtu r074 2003 by gudmandhoyer technical university of denmark enclosure c2 a guidance to calculate the moment capacity in a bubbledeck joint. Find effective depth d, assuming reinforcement diameter. Manual for design and detailing of reinforced concrete to the september 20 code of practice for structural use of concrete 20 2. 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. To study the behavior of flat slab commercial building in various seismic zones. 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.
Prepared for the pci hollow core slab producers committee john e. The lateral loads are independently resisted by shear walls. Best practice guide, rationalisation of flat slab reinforcement. Reinforcement l beam reinforcement details l reinforcement detailing of beam l steel reinforcement duration. Rationalisation of flat slab reinforcement construct concrete. Dear all, i face a difficulty in doing the reinforcement details for the flat slab with opening. Punching of flat slabs design for shear at th e column heads 12. This guide provides recommendations for the efficient and economic reinforcement of concrete flat slabs. Prestressed concrete flat slabs notation page i a area, constant in longs formula a,b sides of rectangle a is smaller side a ps area of prestressing tendon a s area of bonded reinforcement a 1,a 2 dista nce from support to point of change of curvature in tendon a cr dist an ce from surface of reinforcement bar to position of crack. Manual for design and detailing of reinforced concrete to.
Although structures having concrete compressive strength exceeding 6000 psi are within the realm of this document, the recommendations limit. Guide to the design and construction of reinforced. Accordingly, main reinforcement is required in the two directions. Cantilever longitudinal and transverse reinforcement bars, supporting beam reinforcement details, adjucent slab top bottom reinforcement. Manual for the design of reinforced concrete building. Two way slab without beams is carried out on the basis of economy. Design manual to bs8110 bs8110 design preface please note that the linkstudpsr design and optimum pattern layout details can be calculated very simply, by using the free linkstudpsr design software available later in 2010 with the minimum of input.
Reinforcement detailing of reinforced concrete slabs. A flat slab is a reinforced concrete slab supported directly by concrete columns without the use of beams. In twoway slab, the live load moments due to a concentrated or locally distributed load may be worked out by pigeauds method but when the deck slab is not made monolithic with the cross beam i. 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. Flat slab haunched slab a longitudinal slab is one of the least complex types of bridge superstructures. To study the behavior of flat slab commercial building under different terrain categories. Design of reinforced concrete structures ii twoway slabs. Reinforced flat slab design excel sheet best online. Manual for design and detailing of reinforced concrete to the. Reinforcement detailing of a slab is done based on its support conditions.
Design of reinforced concrete structures ii twoway slabs 1 1. Difference between one way slab and two way slab system the one way and two way slab systems are the most commonly used floor system in the reinforced concrete structure. Pdf files in the structure component plans for each bridge number following the. Asw area of shear reinforcement in each perimeter around the col. These materials are originally located at different websites. The diameter and spacing of the top reinforcement bars bottom if a transfer slab. Note we need to calculate the typical ls for the 1 st half only, for the 2 nd half we will multiply it by 2 excluding the main bar circular slab reinforcement calculation.
For flat plate slab system, the minimum slab thickness per aci 31814 are. Manual slab reinforcement i should also add that i dont appear to have the reinforcement freeze iconbutton in the toolbar as you show in message 7. Sep 03, 2011 draw panel of slab and indicate maximum design moments, shears and in plane loads, if any, per unit width of slab. But it says in the calculation errors list and the slab reinforcement module as in message 4 that the reinforcement is frozen. Ec2 webinar autumn 2017 lecture 93 minimum mandrel size. This manualfollows in the footsteps of influential guides published by the institution of structural engineers and uses the format of the green book manualfor bs 8110. Determine the area of steel required in the slab at critical sections for column and middle strips. Select reinforcing bars for the slab and concentrate bars near the column, if necessary 5. The main reinforcement for twoway slab are designed in two directions which. Flat slab sized for punching shear and deflection additional reinforcement added to span steel to reduce deflections typically 25% extra on a 7. Terminology layout drawing a layout drawing of a particular floor contains a drawing of vertical loadbearing structural. For a bar adjacent to the face of the member, ab should be taken as.
Flat slab types of flat slab design and its advantages. Reinforced concrete flat slabs are commonly used in construction as they provide a number of benefits to the designer including. Design manual to bs8110 bs8110 design preface please note that the linkstudpsr design and optimum pattern layout details can. Difference between one way slab and two way slab system. Transverse reinforcement at laps bars in tension ec2. 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. Basically, this paper is focused on the comparison in materials between the two slab systems. 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. 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.
Also it should be positioned at the outer sections of the lap as shown. Flat slab analysis, design and detailing pdf civil engineering. Slab supported directly by columns are called flat slab. Bending will take place in the two directions in a dishlike form. Reinforcement detailing for opening in flat slab and beam. The following example illustrates the example building. 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.
Performance of ductile rc flat slab to steel column. Flat slab analysis, design and detailing pdf civil. Step 3 cover to reinforcement determine cover required to reinforcement as per tables 11. Drops should be ignored if the smaller dimension of the drop is less than onethird of the smaller dimension of the panel. Must watch basics of flat slab for better understanding from the link given below. Information on other aspects, su ch as materials, construction methods, placement of concrete, and finishing techniques, is. Drawing principles for layout and reinforcement drawings rozvojove projekty msmt cr rozvojove projekty mladych tymu 4 1. Flat slab seminar report, ppt, pdf for civil engineering. Mar 23, 2015 the distribution of slab moments into column strips and middle strips is to be made in the same manner as specified in direct design method. Concrete floor slab construction process includes erection of formwork, placement of reinforcement, pouring, compacting and finishing concrete and lastly removal of formwork and curing of concrete slab. The concrete society, technical report 64 guide to the.
Flexible column arrangements, this is more difficult to achieve for a beamcolumn design. 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. Wisconsin department of transportation bridge manual. The opening that the architect wants to put is for a scupper drain which have a width of 150 on plan and a depth of approximately 100mm the drain is just to connect to the oil interceptor. Twoway joist concrete slab floor waffle slab system. If no gap between the deck slab and the cross beams is maintained, the slab panel becomes a twoway slab continuous in both the direction.
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. The general criteria used for the design, such as details of material properties are given in a separate report entitled structural design criteria. Different types of shear reinforcement used at column heads. Guide to the design and construction of reinforced concrete. Manual for design and detailing of reinforced concrete to the code. Drop panels play a significant role here as they augment the. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Explore flat slab with free download of seminar report and ppt in pdf and doc format. Saccoman, chairperson james beerbower ernest markle kevin boyle james markle jeffrey butler milo j. Slab supported on two sides and bending takes place predominantly in one direction only is called one way slab.
How to design a flat slab, step by step explained in this video. Apr 12, 2018 two way slab full detail explanation diagrams with site below these links are our civil videos learn field work watch and subscribe for more videos building drawings analysis in telugu. Fire tnoreport for the weena tower rotterdam enclosure d1. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabsonground. Analysis and design of flat slabs in commercial building by. Drafting principles for layout and reinforcement drawings. Design and detailing for bending moment i division of panels and bending moments flat slab panels are divided into column strips and middle strips as shown in figure 1.
Flat slab system is an important division of concrete floor system. Reinforced concrete sloped roof slab overhang detail section detail of a reinforced concrete sloped inclined slab overhang cantilever detail, supported from a concrete beam. Early twoway flat slab construction was built and subjected to load tests in place and scaled models were later tested in laboratories. These slabs are constructed to provide flat surfaces, usually horizontal, in building floors, roofs or other types of structures. While the amount of reinforcement in slab construction varied dramatically, flat slab systems were found to be economical for heavy live load occupancy. Chapter 18 concrete slab structures january 2019 183 18.
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