This design is a complete flat plate slab design, from shear to bending along with design of columns and shear head reinforcement. 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. Mar 23, 2015 flat slabs 5 in an interior span negative design moment 0. The design methods used in etabs analysis are limit state design conforming to indian standard code of practice. Aug 30, 2014 the design i am going to share with you today is design of flat plate slab as by definition. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design. The execution of the design will be explained with reference. Pdf design of flat slab worked example mohamed hussein. Flat slabs design is appropriate for most floor situations and is also suitable for irregular column layouts, curved floor shapes, ramps etc. Flat slab analysis and design free version download for pc.
It provides a working flat surface or a covering shelter in buildings. Flat slabs may have drop panels at columns and columns may have capitals. With the trend towards faster construction and lower design imposed loads, the spare capacity of a slab over its selfweight is being reduced. Cross sectional constant defines torsional properties c x. Pdf flat slabs are highly versatile elements widely used in construction, providing minimum depth, fast construction and allowing flexible. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Flat slab types of flat slab design and its advantages 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 th e column heads 12. Analyze and design flat slab or waffle slab floors. Punching of flat slabs design for shear at the column heads. Slabs of uniform thickness bending and reinforced in two directions and supported directly by columns without beams.
Flat slab analysis and design designs beamless concrete slab floors flat slab or waffle slab in accordance with aci 318. Design considerations for reinforced concrete flat slab floor. Hence the slab is thickened near the columns by providing the drops. Flat slab analysis, design and detailing pdf civil. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. Jul 12, 2018 how to design a flat slab, step by step explained in this video. Design of reinforced concrete structures ii twoway slabs. Foreword this report is intended to serve as a manual of good practice for the design of prestressed concrete flat slabs in addition to the recommended procedures, other methods are described for the sake of completeness and to compare different methods of design.
Thus, flexural design may start with selecting a relatively low reinforcement ratio, say about 0. As with the guide, grid line c will be designed but, for the sake of illustration, coefficients will be. Flat plate slab is that in which slab is directly supported on columns without column capital, drop panel or beams. The design i am going to share with you today is design of flat plate slab as by definition. Analysis and design of flat slabs in commercial building. Explore flat slab with free download of seminar report and ppt in pdf and doc format. Reinforced concrete design 1 design of slab examples and. It is only aapplicable to ductile underreinforced slabs since we assume that the following momentrotation diagram holds. General a slab is a flat two dimensional planar structural element having thickness small compared to its other two dimensions. Flat slab design pdf bs 8110 concrete design for slab flat plate design how to pour a concrete slab slab on grade foundation how to calculate formwork for slab post tension slab how to pour a 26x36 concrwte concrete slab bflat flat earth chopin e flat flat tyre nocturne e flat flat rate flat world flat land flat stomach flat fashion the. Tests of flat plate structures indicate that, in most practical cases, the capacity is governed by shear. These materials are originally located at different websites. The thickness of a floor slab must be determined early in design because the weight of the slab is an important part of the dead load of the structure.
The design moment of the slab is modified for each design section to include the twisting moment of the same section woodarmer approximation. Bending will take place in the two directions in a dishlike form. Moreover, the design and construction details of this parking garage are used to illustrate code requirements, flatslab analysis, design details, and the construction of gfrprc flat slabs. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. 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.
Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Dhang, department of civil engineering, iit kharagpur. Able to carry heavier loads and span longer than ribbed slabs. Beamless slabs beamless slabs are supported only on columns and are applied mostly in large industrial and public buildings. Design of prestressed concrete flat slabs mafiadoc. A civil engineer must know all the aspects regarding the flat floor system.
The slab is 300 mm thick and columns are 400 mm square. Department of mechanics, materials and structures english. Flat slab types of flat slab design and its advantages. For slabs spanning in both directions published tables and charts should be used to find bending moment and shear per unit width of slab. Lecture series on design of reinforced concrete structures by prof. Later in 1914, nicholas proposed a method of analysis of flat slabs based on simple statics. Designing for shear in slabs including punching shear. Nancy debora assistant professor civil karunya university 2. Analyses are for a onebaywide strip using the equivalent frame analysis method of the aci code.
It is closely related to the plastic collapse or limit analysis of steel frames, and is an upper bound or mechanism approach. Shear is critical in flat slabs the design shear force veff is the column reaction vt multiplied by 1. The following sections outline the solution per ddm, efm, and spslab software respectively. Design the slab, following the provisions of the ack code. The slab is part of a larger floor plate and is taken from guide to the design and construction of reinforced concrete flat slabs29\ where finite element analysis and design to eurocode 2 is illustrated. Jul 02, 2010 lecture series on design of reinforced concrete structures by prof. The goal of the preliminary design is to check if the dimensions of the structure are reasonable with respect to. Flat slab seminar report, ppt, pdf for civil engineering. There are many advantages of flat slab such as increased head room, easier flow of mechanical and electrical services.
Different types of shear reinforcement used at column heads. To calculate the moments and stresses due to unbalanced service loads and to calculate the factored design moments and shears in the slab in order to check for strength, one of the methods described in the following sections may be adopted. The benefits of choosing flat slabs include a minimum depth solution, speed of construction, flexibility in the plan layout both in terms of the shape and column layout, a flat soffit clean finishes and freedom of layout of. Flat slabs can offer economical solutions to wider floor spans in a reinforced concrete building. Flat slab is a reinforced concrete slab supported directly by concrete columns. Accordingly, main reinforcement is required in the two directions. Flat slab design pdf bs 8110 concrete design for slab flat plate design how to pour a concrete slab slab on grade foundation how to calculate formwork for slab post tension slab how to pour a 26x36 concrwte concrete slab bflat flat earth chopin e flat flat tyre nocturne e flat flat rate flat world flat land flat. Oneway and twoway slabs university of asia pacific. A detailed explanation will be given of the checksto be carried out, the aspects to be considered in the design and the construction procedures and sequences of a posttensioned slab. A typical load history for a flat slab in practice is shown in figure 4. The distribution of reinforcement throughout the slab is based on the elastic distribution of design moments outlined by the american concrete. 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.
Flat slabs are slabs that are supported directly by columns without floor beams. As a result, the design moments used for the determination of reinforcement are somewhat larger than the actual bending moments generated in the slab. Flat plate slabs under unbalanced loads, moments and shears are induced in the slab. Design example stefan lips, aurelio muttoni, miguel fernandez ruiz. Blast design procedure for flat slab structures dtic. Design methodology design methodology simplified method table 3. Flat slab design spreadsheets to eurocode excel sheets. They may be supported on two opposite sides only fig. The slab has to carry a distributed permanent action of 1. Because of the brittle nature of shear failures, conservative design is necessary. This method is used even today for the design of flat slabs and flat plates and is known as the direct design method. The slab is for an offi ce where the specifi ed load is 1.
Flat slab system is an important division of concrete floor system. 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. Moreover, the design and construction details of this parking garage are used to illustrate code requirements, flat slab analysis, design details, and the construction of gfrprc flat slabs. The basic spaneffective depth ratios are multiplied by 0.
The design involves load calculations and analyzing the whole structure by etabs. Shear strength of beamless slabs usually a controlling factor. A reinforced concrete slab is built integrally with its supports and consists of two equal spans, each with a clear span of 15 ft. The strip may have up to 20 spans and may have cantilevers at the ends. The slab is part of a larger floor plate and is taken from guide to the design and construction of reinforced concrete flat slabs 29\ where finite element analysis and design to eurocode 2 is illustrated. A high ratio of dead to live load is an inherent feature of flat slabs and reinforced concrete construction in general. The service live load is 100 psf, and 4000 psi concrete is specified for use with steel with a yield stress equal to 60,000 psi. A finite element model may be created to analyse a complicated loading arrangement. Flat slabs design and construction ec2 concrete structures. Design moments in the slabs are more near the column. A total of seven largescale flat plate slabs 1,700 x 1,700 x 150 mm were constructed and loaded up to failure. Flat slab analysis, design and detailing pdf civil engineering. The test specimens were characterized as falling into two groups according to the.
Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Design of reinforced concrete structures ii twoway slabs 8 c. Sep 03, 2011 design of reinforced concrete slabs 107 b 1. How to design a flat slab, step by step explained in this video. The principle objective of this project is to analyze flat slabs using etabs, to get the optimum design. Direct design method ddm twoway slabs satisfying the limits in aci 31814 8.
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 minimum thickness can be determined by many factors. The best flat slab analysis, design and detailing related pdf and slides are provided here altogether. Lateral stability buildings with flat plate design is generally less rigid lateral stiffness depends largely on the configuration of lift core position, layout of walls and columns frame action is normally insufficient to resist lateral. Design of reinforced concrete structures ii twoway slabs 1 1. Bm and sf coefficients for flat slab or 3 or more equal spans outer support.
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