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. Detailed analysis and design as per indian standards. 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. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Design of flat slab with drop in safe 2016 part duration. Design the slab, following the provisions of the ack code. The basic spaneffective depth ratios are multiplied by 0. The benefits of using insitu concrete flat slab construction should be investigated at the conceptual design.
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. Design example of punching shear in slabs eurocode 2. Nancy debora assistant professor civil karunya university 2. Trimble is an international company focusing on positioningrelated technology for different industries. Flat slabs are generally assumed to be struck and have become selfsupporting prior to additional loads being placed on the slab the methods of backpropping flat slabs in this handout allow for one or two levels of backpropping as shown in figure 1. Punching of flat slabs with large amounts of shear.
Download file pdf flat slab manual design bs flat slab manual design bs flat slab design example part 1 how to design a flat slab, step by step explained in this video. Design considerations for reinforced concrete flat slab. Flat slabs may have drop panels at columns and columns may have capitals. Unfortunately, specific design provisions for shear strength and flexural strength of unbonded prestressed slabs are not provided in the present aci code aci 31871. 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. Flat slabs are slabs that are supported directly by columns without floor beams. Twoway flat slab concrete floor system with drop panels. The best flat slab analysis, design and detailing related pdf and slides are provided here altogether. The thickness of the slab is sufficient if shear reinforcement is used.
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 plates and flat slabs such slabs are described as. 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. Flat slab seminar report, ppt, pdf for civil engineering. Department of mechanics, materials and structures english. This design is a complete flat plate slab design, from shear to bending along with design of columns and shear head reinforcement. The design i am going to share with you today is design of flat plate slab as by definition. Punching shear strength of concrete flat plate slabs. Analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter.
The project aims at analysis and design of pyramidal slab as per standard provisions. Analyze and design flat slab or waffle slab floors. Different types of shear reinforcement used at column. Flat plate slab is that in which slab is directly supported on columns without column capital, drop panel or 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. Various simplified methods are therefore adopted for determining moments, shears and reactions in such slabs. Aug 30, 2014 the design i am going to share with you today is design of flat plate slab as by definition. 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. However, flat slabs have a lower stiffness in comparison to a beamcolumn floor plan which can lead to relatively large deflections. For slabs spanning in both directions published tables and charts should be used to find bending moment and shear per unit width of slab. There are many advantages of flat slab such as increased head room, easier flow of mechanical and electrical services.
Flat slabs carried on columns and edge beams or walls with no interior beams. Punching of flat slabs design for shear at the column heads. A reinforced concrete slab is built integrally with its supports and consists of two equal spans, each with a clear span of 15 ft. Flat slab analysis, design and detailing pdf flat slab system is an important division of concrete floor system. Common practice of design and construction is to support the slabs by beams and support the beams by columns. Pdf in the construction industry, the need for flat slabs supported on columns in an irregular layout is rising. 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. 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. Design example stefan lips, aurelio muttoni, miguel fernandez ruiz. Flat slab analysis and design free version download for pc. Pdf design of reinforced concrete flat slab with drop. The minimum thickness can be determined by many factors.
Flat plate reinforce concrete slab design architectural engineering senior thesis washington park condominiums final report mt. Pdf irregular flat slabs designed according to the structural. Flat slab analysis and design designs beamless concrete slab floors flat slab or waffle slab in accordance with aci 318. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Explore flat slab with free download of seminar report and ppt in pdf and doc format. Guide to the design and construction of reinforced concrete. 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.
Jul 02, 2010 lecture series on design of reinforced concrete structures by prof. 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. Design procedure steps for one way slab slab design steps. Flat slab system is an important division of concrete floor system. Department of mechanics, materials and structures english courses. Flat plate slabs under unbalanced loads, moments and shears are induced in the slab. It is only aapplicable to ductile underreinforced slabs since we assume that the following momentrotation diagram holds. These materials are originally located at different websites. 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. The behavior of posttensioned flat plates in the critical column area is of great concern to designers. Two types of shear may be critical in the design of the flat slabs.
Guide to the design and construction of reinforced. They may be supported on two opposite sides only fig. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. Analyses are for a onebaywide strip using the equivalent frame analysis method of the aci code. Must watch basics of flat slab for better understanding from the link given below. This educational solved example for the design of reinforced concrete flat slab with drop panel, and check for punching shear. Structural design of flat slabs to eurocode 2 structville. Design manual to bs8110 outline of the bs8110 design process outline of the bs8110 design process calculate vc concrete shear capacity without reinforcement the design process for the now withdrawn bs8110 design standard works slightly differently to that used in. Flat slab design example free download as pdf file. Thus, flexural design may start with selecting a relatively low reinforcement ratio, say about 0. Excel sheet to design flat slab according to eurocode. Twoway flat slab concrete floor system with drop panels analysis and design cac design handbook the concrete floor slab system shown below is for an intermediate floor to be designed considering partition weight 1 knm2 and mechanical services load 1 knm2, and unfactored live load 3.
Shear is critical in flat slabs the design shear force veff is the column reaction vt multiplied by 1. Punching of flat slabs design for shear at th e column heads 12. Flat slabs are generally assumed to be struck and have become selfsupporting prior to additional loads being placed on the slab the methods of backpropping flat slabs in this. Different types of shear reinforcement used at column heads. Flat slabs concrete columns reinforced flat slab design. A civil engineer must know all the aspects regarding the flat floor system. And this is your lecture number 14, design of slabs part 1. 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. Must watch basics of flat slab for better understanding from the link. Limit state method is used for analysis and design. So, we have a few more lecturers, so today we shall start part 1. The project also consists of cross check of manual results with the. For those who do not know what are the des ign requirements of a slab.
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. Lecture series on design of reinforced concrete structures by prof. Flat slabs can offer economical solutions to wider floor spans in a reinforced concrete building. Sachpazis date 18012014 chkd by date appd by 2 characteristic strength of concrete. 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. Flat slab types of flat slab design and its advantages. Flat slab analysis and design pdf flat slab design pdf 1. Sep 03, 2011 design of reinforced concrete slabs 103 calculated punching shear stress at perimeter ui shear force per unit width for bending about xaxis shear force per unit width for bending about yaxis maximum crack width mm depth of neutral axis from compression face distance from edge in ldirection to start of a yield line. Flexible column arrangements, this is more difficult to achieve for a beamcolumn design.
Dhang department of civil engineering indian institute of technology kharagpur lecture 14 design of slabs today, we shall start design of slabs. In a flat slab building, you can do a punching shear calculation based on the reaction but, in a slab bridge, a. The construction design and management regs 2015 legal guidance l153 ref. A civil engineer should study these lectures and materials for structural engineering acumen.
Flat slab analysis, design and detailing pdf civil engineering. Dhang, department of civil engineering, iit kharagpur. 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 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. 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. Pdf this paper deals with the problem of optimum design of reinforced concrete flat slabs by genetic algorithm. Pdf analysis and design of rcc and posttensioned flat. Oneway and twoway slabs university of asia pacific. 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. Flat slab design structural analysis beam structure. Introduction to flat slabs modelling of reinforced. Without beams, flat plates and flat slabs tests of flat plate structures indicate that in most practical cases, the capacity is governed by shear. Flat slab analysis, design and detailing pdf civil. Here are the steps for the design procedure for one way slab in steps.
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. The flat slabs provide various benefits like depth solution, flat soffit and adaptability in design layout. 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. Quite popular and widely used among these methods is one using moment coefficient. The execution of the design will be explained with reference. The slab has to carry a distributed permanent action of 1. Reinforced concrete design 1 design of slab examples.
Slabs may be simply supported or continuous over one or more supports and are classified according to the method of support as follows. Shear strength of beamless slabs usually a controlling factor. Design considerations for reinforced concrete flat slab floor system harshal deshpande1, radhika joshi2. It is closely related to the plastic collapse or limit analysis of steel frames, and is an upper bound or mechanism approach. The two classifications are oneway slab and twoway slab. Flat plate concrete floor system does not use beams between columns or. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Tests of flat plate structures indicate that, in most practical cases, the capacity is governed by shear.
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. 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. General a slab is a flat two dimensional planar structural element having thickness small compared to its. Caprani civil engineering design 1 analysis and design of slabs 20067 dr. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Jul 12, 2018 how to design a flat slab, step by step explained in this video. The beams reduce the available net clear ceiling height.