Sachpazis date 18012014 chkd by date appd by 1 flat slab design to bs8110. This assumes that the slab thickness has previously been determined during conceptual design. Pdf unified equivalent frame method for flat plate slab structures. Data obtained can then be used to determine the reliability of analysis and design techniques presently being used in practice. A combination of these values will determine the slab stresses at the time of stressing and at service loads. A series of drawings in the appendixes presents basic relations. To design the slab, in the modelling mode, go to design concrete specify the design parameters click on commands select design slabelement and assign it to the required plate elements. A procedure for carrying out the detailed design of flat slabs is shown in table 1 below. Flat plate slab is that in which slab is directly supported on columns without column capital, drop panel or beams. Moody division of design denver, colorado united states department of the interior bureau of reclamation. A total of seven largescale flat plate slabs 1,700 x 1,700 x 150 mm were constructed and loaded up to failure. Pdf in the construction industry, the need for flat slabs supported on columns in. Slabs without special shear reinforcement two kinds of shear may be critical in the design of flat slabs, flat plates, or footings.
Flat slab structure with column drop and shear wall together through response spectrum method by using etabs software. Types of economical floor systems for reinforced concrete. The rest of the floor can be slightly thinner with less dead weight. Flat plate slab may be analyzed and designed by any method as long as they satisfy the strength, stiffness and stability requirements of the is 456. Oneway wide module joist slab in the lower middle is a variation on the oneway. Therefore, the slab can be reinforced with shear reinforcement complying with detailing rules defined in subclause 7. Flat slabs may have drop panels at columns and columns may have capitals. 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. A better understanding of the lateral behavior of flat plates is needed together with more specific design criteria for slabcolumn connections in seismic regions. 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. Design considerations for reinforced concrete flat slab floor. The following example illustrates the example building.
For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. Oneway and twoway slabs university of asia pacific. Flat plate concrete floor system does not use beams between columns or. Can be used for larger spans with relatively higher cost and higher deflections oneway joist system suitable span 6 to 9m with ll 46knm2.
A flat plate floor can be constructed with an economical span of 6 to 8m for ordinary reinforced flat plate floor. Aci code specified the dimension of drop panels so as to take advantage of this reduced thickness. Flat slab types of flat slab design and its advantages. Bm and sf coefficients for flat slab or 3 or more equal spans outer support. Must watch basics of flat slab for better understanding from the link given below. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Flat slab system is an important division of concrete floor system. Engineered solutions structural plate design guide 7. A 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. Load transfer in a oneway slab, b twoway slab nilson fig. Twoway flat plate concrete floor system analysis and. Wiesinger proposed to divide the panel into triangular grid and.
The application of these recommendations is illustrated through numerical examples. Flat slab analysis and design free version download for pc. Reinforced concrete flat plate system, eugene, usa s. How to design a flat slab, step by step explained in this video. Plate to seed bflat the world is flat hot flat and crowded pdf flat roof flat stomach flat tyre chopin e flat flat world flat rate flat land nocturne e flat flat fashion flat earth car plate b flat. Request pdf design of flat plate voided concrete slab systems synopsis.
Design of reinforced concrete structures ii twoway slabs. The strip may have up to 20 spans and may have cantilevers at the ends. Jul 12, 2018 how to design a flat slab, step by step explained in this video. A flat plate is a one or twoway system usually supported directly on columns or load bearing walls. Explore flat slab with free download of seminar report and ppt in pdf and doc format. 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. Department of mechanics, materials and structures english. Flat slab is a reinforced concrete slab supported directly by concrete columns without the use of beams. The test specimens were characterized as falling into two groups according to the. The load paths for both the flat plate and the edgesupported slabs are, however, essentially the same. Structural plate design guide 4 typical design steps structure shape geometry shapes span x rise common uses steel aluminum trade name round 5 to 506 culverts, storm sewers, aggregate tunnels, vehicular and pedestrian tunnels and stream enclosures. The allowable bearing capacity for the supporting soil is 60 knm 2. Blast design procedure for flat slab structures dtic.
For beamless slabs, the choice between a flat slab and a flat plate is usually a matter of loading and span. Effect of column dimensions on the punching shear of flat slab. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Flat slab analysis, design and detailing pdf civil. A simplified drawing of a flat slab plate or waffle slab structure adapted from. Twoway flat plate concrete floor system design structurepoint. Design of flat plate voided concrete slab systems request pdf. The following example illustrates the design methods presented in the pca book simplified design. Different types of shear reinforcement used at column heads. Design the exterior panel of a flat slab of size 6 m. Flat plate design will facilitate the use of big table formwork to increase productivity. The first is the familiar beamtype shear leading to. Bending will take place in the two directions in a dishlike form.
The behavior of flat slab is investigated in terms of the following factors. This example focuses on the analysis of flat plates using efm. Tests of flat plate structures indicate that, in most practical cases, the capacity is governed by shear. Design methodology design methodology simplified method table 3. Functions well in all applications, but especially in those with high cover x x multiplate. Flat slab design pdf design of two way slab example pdf bs 8110 concrete design for slab flat plate design slab on grade foundation how to calculate formwork for slab how to pour a concrete slab post tension slab beam and slab bridge uk beam and slab bridge concrete beam and slab bridge how to pour a 26x36 concrwte concrete slab operation.
Direct design method ddm for slab systems with or without beams loaded only. Jul 28, 2014 the flat plate is a twoway reinforced concrete framing system utilizing a slab of uniform thickness, the simplest of structural shapes. Strength investigation and strengthening of existing floor slabs. Design of rcc flat slab structure under earthquake loading. The base specimen has no shear reinforcement, and the other. Flat plate reinforce concrete slab design architectural engineering senior thesis washington park condominiums final report mt. Twoway flat plate concrete floor system analysis and design cac design handbook. Flat plate slabs the edge beams have the same depth as the remainder of the slab panel, and therefore the system tends to be less stiff and more prone to serviceability problems. It is claimed that the cost of formwork, concrete material placement and finishing, and steel placement are 47%, 36%, and 17%, respectively of. Design of reinforced concrete structures ii twoway slabs 1 1.
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. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Pdf the equivalent frame method efm is widely used for the design of two way reinforced concrete slab structures, and current design. Design considerations for reinforced concrete flat slab. It is desired to design the raft slab shown below to support the column loads for a building as given below. The concrete floor slab system shown below is for an intermediate floor to be. Punching shear always a critical consideration in flat plate design around the columns instead of using thicker section, shear reinforcement in the form of. Voided concrete flat plate slab systems, which have been used for many years in europe and other parts of the world, are. Pdf irregular flat slabs designed according to the structural.
The general criteria used for the design, such as details of material properties are given in a separate report entitled structural design criteria. Comparison of oneway and twoway slab behavior economic choices oneway slab on beams suitable span 3 to 6m with ll 35knm2. The floor system is supported by columns of size 500 mm. The design shear force v d is below the maximum punching strength v rd,max. Flat slab, shear wall, linear dynamic analysis, base shear, time period, story drift, storey displacement 1 introduction from last two decades there is a high increase in the high rise buildings and modern trend is towards high rise. These materials are originally located at different websites.
Analysis, design and investigation of beams, one and twoway slab systems, flat plate, flat slab, waffle slab and slab bands. The following sections outline the solution per ddm, efm, and spslab software respectively. A civil engineer must know all the aspects regarding the flat floor system. 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. For uniformly distributed loads of w per square foot of the slab, each strip acts approximately like a simple beam uniformly loaded by its share of w. Pdf the equivalent frame method efm is widely used for the design of twoway reinforced concrete slab structures, and current design.
Accordingly, main reinforcement is required in the two directions. Firstly, the depth depends on the loading conditions and the functional requirement of the building. Flat slab analysis and design designs beamless concrete slab floors flat slab or waffle slab in accordance with aci 318. Direct design method ddm twoway slabs satisfying the limits in aci 31814 8. All anchor bolt shall have plate wahers a minimum of 2x2x316 thick. Design and detailing of flat slab ese soedarsono hs 27 february 2002 content introduction benefits design. Nancy debora assistant professor civil karunya university 2.
The design i am going to share with you today is design of flat plate slab as by definition. Punching of flat slabs design for shear at th e column heads 12. The flat plate is a twoway reinforced concrete framing system utilizing a slab of uniform thickness, the simplest of structural shapes. Flat slab analysis, design and detailing pdf civil engineering. A flat slab is a reinforced concrete slab supported directly by concrete. Firstly, one has to check if the design shear force v d is smaller than the maximum punching strength v rd,max. Flat plateslab may be analyzed and designed by any method as long as they satisfy the strength, stiffness and stability requirements of the is 456. Analyses are for a onebaywide strip using the equivalent frame analysis method of the aci code.
Advantages and disadvantages of flat slabs civil engineering. Aug 30, 2014 the design i am going to share with you today is design of flat plate slab as by definition. Detailed illustration of analysis and design of flat plate slab using ddm can be found in twoway flat plate concrete slab floor analysis and design csa a23. Flat plate design flat slab design pdf bearing plate design plate type heat exchanger design calculation pdf unit topic selection seed to plate. Pdf cantilever slab design ramjan shehzaad academia. A study of flat plate slab column connections with shear plate. Deep ribs, the concrete and steel quantities are relative low expensive formwork expected. 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. Flat slab sized for punching shear and deflection additional reinforcement added to span steel to reduce deflections typically 25% extra on a 7. Drop panels play a significant role here as they augment the. Regarding the depth of the slab there is a little contradiction. Charleson, seismic design for architects, architectural press 2008, p.
The design loads, required spans, serviceability requirements, and strength requirements are all important. Diagram showing examples of flat plate and flat slabs. A reinforcedconcrete slab is a broad, flat plate, usually horizontal, with top and bottom surfaces parallel or nearly so. Flat plate strength is often governed by shear strength at the columns, and for service. 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. Twoway flat plate concrete floor system analysis and design. This system is similar to the twoway flat plate system except there is a drop panel to provide extra thickness around the columns. The pca computer program pcaslab can be used to expedite the design of different slab systems. This research presents the best reinforced concrete flat slabs that resist burning of low cost and. Plate to seed b flat the world is flat hot flat and crowded pdf flat roof flat stomach flat tyre chopin e flat flat world flat rate flat land nocturne e flat flat fashion flat earth car plate b flat. Flat slab design pdf design of two way slab example pdf bs 8110 concrete design for slab flat plate design slab on grade foundation how to calculate formwork for slab how to pour a concrete slab post tension slab beam and slab bridge uk beam and slab bridge concrete beam and slab bridge how to pour a 26x36 concrwte concrete slab. Flat slab seminar report, ppt, pdf for civil engineering. This design is a complete flat plate slab design, from shear to bending along with design of columns and shear head reinforcement.
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