It was found that a certain amount of poor design was prevalent, and the. Comparative study of reinforced concrete flat slabs with and. The best flat slab analysis, design and detailing related pdf and slides are provided here altogether. Flat slab analysis and design pdf flat slab design pdf 1. Analysis, design and investigation of beams, one and twoway slab systems, flat plate, flat slab, waffle slab and slab bands. For the flat slab with the general arrangement as shown below, let us design the punching shear for column b1 given the following design information. Oct052018 twoway flat slab concrete floor with drop panels system analysis and design csa a23. Benefit of using flat slabs are manifold not only in terms of prospective design and layout efficacy but is also helpful for total construction process especially for easing off installation procedures and saving on construction time.
Shear design in flat plates and flat slabs when twoway slabs are supported directly by columns, as in flat slabs and flat plates, or when slabs carry concentrated loads, as in footings, shear near the columns is of critical importance. Third year civil technician diploma reinforced concrete design. Flat slabs are being used mainly in office buildings due to reduced formwork costs, fast execution and easy installation. This design is a complete flat plate slab design, from shear to bending along with design of columns and shear head reinforcement.
They may be supported on two opposite sides only fig. Flat slab called beamless slab is a slab supported directly by columns without beams. Here are the steps for the design procedure for one way slab in steps. For those who do not know what are the des ign requirements of a slab. Design of flat slabs for punching european and north.
Aci318 code provides two design procedures for slab systems. According to the 1995 aci code, all twoway reinforced concrete slab systems, including edge supported slabs, flat slabs, and flat plates, are to be analyzed and designed according to one unified method, such as direct design method and equivalent frame method. Explore flat slab with free download of seminar report and ppt in pdf and doc format. 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 b flat flat earth chopin e flat flat tyre nocturne e flat flat rate flat world flat land flat stomach flat fashion the world. Design considerations for reinforced concrete flat slab. Before going to this topic, please read it there are two types of slab classification based on the direction of bending occurs in these slabs.
A part of slab bounded on each of the four sides by centre line of column is called a panel. There are many advantages of flat slab such as increased head room, easier flow of mechanical and electrical services, ease in construction of form work, faster construction etc. Abstract intended to provide information and current best practice on the design and construction of reinforced concrete flat slabs in accordance with eurocode 2 bs en 1992 and the national structural concrete specification. Flat slab design example architectural design civil. 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. Twoway slabs have two way bending unlike oneway slab. The general criteria used for the design, such as details of material properties are given in a separate report entitled structural design criteria. These materials are originally located at different websites. Pdf design of reinforced concrete flat slab with drop.
Sep 03, 2011 design of reinforced concrete slabs 107 b 1. Spanning one way between beams or walls spanning two ways between the support beams or walls flat slabs carried on columns and edge beams or walls with no interior beams type of slab. It is closely related to the plastic collapse or limit analysis of steel frames, and is an upper bound or mechanism approach. The design of reinforced concrete flat slabs is governed by deflection or punching. Pdf analysis and design of rcc and posttensioned flat. Flat slabs concrete columns reinforced flat slab design. A civil engineer should study these lectures and materials for structural engineering acumen. Flat slab analysis, design and detailing pdf civil engineering.
Flat slabs can offer economical solutions to wider floor spans in a reinforced concrete building. Two types of shear may be critical in the design of the flat slabs. Slab resting on walls or sufficiently deep and rigid beams on all sides. Flat plate slab is that in which slab is directly supported on columns without column capital, drop panel or beams. 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. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Design procedure steps for one way slab slab design steps.
The benefits of using insitu concrete flat slab construction should be investigated at the conceptual design stage. 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. Bending will take place in the two directions in a dishlike fo. Tests of flat plate structures indicate that, in most practical cases, the capacity is governed by shear. The slab is for an offi ce where the specifi ed load is 1. In this study fe analysis of flat slabs is proposed. The reinforcement for the column strip was design for the direction from easttowest only. Flat slab analysis, design and detailing pdf flat slab system is an important division of concrete floor system. This educational solved example for the design of reinforced concrete flat slab with drop panel, and check for punching shear. Flat slabs may have drop panels at columns and columns may have capitals. 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 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. 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.
Flat slab system is an important division of concrete floor system. Hence the flat slabs 3 l2a l2b c of panel a c of panel b middle stripmiddle strip column 4 advanced r. In a flat slab building, you can do a punching shear calculation based on the reaction but, in a slab bridge, a. Different types of shear reinforcement used at column heads. Bending will take place in the two directions in a dishlike form. Flat slab analysis and design designs beamless concrete slab floors flat slab or waffle slab in accordance with aci 318. Twoway flat slab concrete floor with drop panels system. Panel may be divided into column strip and middle strip. Caprani civil engineering design 1 analysis and design of slabs 20067 dr. For span from 5 to 9m thin flat slabs are the preferred solution for the construction of in situ concrete frame building, where a square or near square grid is used. The execution of the design will be explained with reference.
Tr 64 guide to the design and construction of reinforced. Flat slab analysis, design and detailing pdf civil. Jul 12, 2018 how to design a flat slab, step by step explained in this video. The minimum thickness can be determined by many factors. Aug 30, 2014 the design i am going to share with you today is design of flat plate slab as by definition. Benefits of flat slabs can be gained in the form of prospective design and layout efficiency as well as for total construction process especially for simplifying installation methods and saving on construction time. Structural design of flat slabs to eurocode 2 structville. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. Design of reinforced concrete structures ii twoway slabs. Pdf flat slabs are highly versatile elements widely used in construction, providing minimum depth, fast construction and allowing flexible. The basic spaneffective depth ratios are multiplied by 0.
Analyses are for a onebaywide strip using the equivalent frame analysis method of the aci code. Design the slab, following the provisions of the ack code. Flat slab seminar report, ppt, pdf for civil engineering. The beams reduce the available net clear ceiling height.
Even though building flat slabs can be an expensive affair but gives immense freedom to architects and engineers the luxury of designing. Jul 02, 2010 lecture series on design of reinforced concrete structures by prof. Twoway flat slab concrete floor with drop panels system analysis and design csa a23. Punching of flat slabs design for shear at th e column heads 12. 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.
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. Must watch basics of flat slab for better understanding from the link given below. This method is used even today for the design of flat slabs and flat plates and is known as the direct design method. Flat slabs are slabs that are supported directly by columns without floor beams. Later in 1914, nicholas proposed a method of analysis of flat slabs based on simple statics. 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. Shear is critical in flat slabs the design shear force veff is the column reaction vt multiplied by 1. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Shear strength of beamless slabs usually a controlling factor. Information on other aspects, su ch as materials, construction methods, placement of concrete, and finishing techniques, is.
Oneway and twoway slabs university of asia pacific. Design considerations for reinforced concrete flat slab floor. Punching of flat slabs design for shear at th e column heads 1. The depth of the drop panel is 250 mm and the slab depth. 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. Design example stefan lips, aurelio muttoni, miguel fernandez ruiz. Slabs may be simply supported or continuous over one or more supports and are classified according to the method of support as follows. Flat slab analysis and design free version download for pc. Flat slab is a reinforced concrete slab supported directly by concrete columns without. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. The lateral loads are independently resisted by shear walls. Strength investigation and strengthening of existing floor slabs.
Spanning one way between beams or walls spanning two ways between the support beams or walls flat slabs carried on columns and edge beams or walls with no interior beams. Dhang, department of civil engineering, iit kharagpur. Tr 64 guide to the design and construction of reinforced concrete flat slabs. It is only aapplicable to ductile underreinforced slabs since we assume that the following momentrotation diagram holds. There are many advantages of flat slab such as increased head room, easier flow of mechanical and electrical services. Example 1 the floor of a building constructed of flat slabs is 30. General a slab is a flat two dimensional planar structural element having thickness small compared to its. Analysis and design of slabs two way two way edge supported slabs twoway slabs. The design i am going to share with you today is design of flat plate slab as by definition. The slab is 300 mm thick and columns are 400 mm square. 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.
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. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Master of science and hereby certify that, in their opinion, it is worthy of acceptance. By doing the comparative analysis and design of posttensioned flat slab with a conventional slab, we can show how beneficial will be the process of making pt flat slab than other slabs. Flat slab design example free download as pdf file. The two classifications are oneway slab and twoway slab.
Design example of punching shear in slabs eurocode 2. Pdf design of flat slab worked example mohamed hussein. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabs onground. Design of flat slab with edge beams by direct design method 16 14 14 3 b c 1 c 2 c 3 c 4 3 1 c 5 c. Beamcolumn frame system and flat plate slab system are analysed by semiempirical, direct design method ddm and approximate elastic method, equivalent frame method fem and the results of both. Nancy debora assistant professor civil karunya university 2. Flat slab types of flat slab design and its advantages. Reinforced concrete building design sketch up animation. Analysis and design of slabs two way civil engineers pk. A finite element model may be created to analyse a complicated loading arrangement.
Sachpazis date 18012014 chkd by date appd by 1 flat slab design to bs8110. The benefits associated with flat slab construction may well outweigh those of other structural solutions, which could be more complicated, timeconsuming and ultimately more costly. Bridge approach slab analysis and design incorporating elastic soil support presented by. The slab has to carry a distributed permanent action of 1. Design considerations for reinforced concrete flat slab floor system harshal deshpande1, radhika joshi2. 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. Slabs may be simply supported or continuous over one or more supports and are classified according to the method of support. The benefits of using insitu concrete flat slab construction should be investigated at the conceptual design.
Reinforced concrete design 1 design of slab examples. The reduced storey height and consequently the reduced height of the building result in lower overall construction and maintenance costs. The flat slabs provide various benefits like depth solution, flat soffit and adaptability in design layout. Equivalent frame method most commonly used method the flat slab structure is divided longitudinally and transversely into frames consisting of columns and strips of slabs with. Analyze and design flat slab or waffle slab floors. A civil engineer must know all the aspects regarding the flat floor system. Without beams, flat plates and flat slabs tests of flat plate structures indicate that in most practical cases, the capacity is governed by shear. Designing for shear in slabs including punching shear. Flat slabs for efficient concrete construction construct concrete. For slabs spanning in both directions published tables and charts should be used to find bending moment and shear per unit width of slab. Pdf design comparison of slab system by direct design. Department of mechanics, materials and structures english courses. Department of mechanics, materials and structures english.
132 557 685 869 1604 787 264 1111 734 1428 143 670 422 1197 1047 248 172 1523 108 972 70 1384 444 1443 244 272 477 734 342 1022 508 528 492 176 740 67 1352 391 1378 1076 1284 1142 1329 720 385 330 1072 450 190