Can be used for larger spans with relatively higher cost and higher deflections oneway joist system suitable span 6 to 9m with ll 46knm2. 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. Direct design method ddm twoway slabs satisfying the limits in aci 31814 8. 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. Twoway flat plate concrete floor system analysis and design.
Flat slab structure with column drop and shear wall together through response spectrum method by using etabs software. Moody division of design denver, colorado united states department of the interior bureau of reclamation. Design the exterior panel of a flat slab of size 6 m. Voided concrete flat plate slab systems, which have been used for many years in europe and other parts of the world, are. A study of flat plate slab column connections with shear plate. Reinforced concrete flat plate system, eugene, usa s. A combination of these values will determine the slab stresses at the time of stressing and at service loads. Aug 30, 2014 the design i am going to share with you today is design of flat plate slab as by definition. 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. How to design a flat slab, step by step explained in this video. 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. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. A total of seven largescale flat plate slabs 1,700 x 1,700 x 150 mm were constructed and loaded up to failure.
Bm and sf coefficients for flat slab or 3 or more equal spans outer support. Types of economical floor systems for reinforced concrete. The load paths for both the flat plate and the edgesupported slabs are, however, essentially the same. Flat plate design flat slab design pdf bearing plate design plate type heat exchanger design calculation pdf unit topic selection seed to plate. Flat slab sized for punching shear and deflection additional reinforcement added to span steel to reduce deflections typically 25% extra on a 7. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Oneway wide module joist slab in the lower middle is a variation on the oneway. The concrete floor slab system shown below is for an intermediate floor to be. Design of rcc flat slab structure under earthquake loading. The application of these recommendations is illustrated through numerical examples. The pca computer program pcaslab can be used to expedite the design of different slab systems. Tests of flat plate structures indicate that, in most practical cases, the capacity is governed by shear. Design considerations for reinforced concrete flat slab floor. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems.
A flat plate is a one or twoway system usually supported directly on columns or load bearing walls. Design of reinforced concrete structures ii twoway slabs 1 1. Load transfer in a oneway slab, b twoway slab nilson fig. The design loads, required spans, serviceability requirements, and strength requirements are all important.
For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. Aci code specified the dimension of drop panels so as to take advantage of this reduced thickness. This assumes that the slab thickness has previously been determined during conceptual design. Analyses are for a onebaywide strip using the equivalent frame analysis method of the aci code. Concept designs prepared assuming detailed design would be to bs 8110 may be continued through to detailed design using eurocode 2. Advantages and disadvantages of flat slabs civil engineering.
A flat plate floor can be constructed with an economical span of 6 to 8m for ordinary reinforced flat plate floor. Flat slab analysis and design free version download for pc. The design shear force v d is below the maximum punching strength v rd,max. It is one of the most common forms of construction of floors in buildings. The first is the familiar beamtype shear leading to. Pdf the equivalent frame method efm is widely used for the design of two way reinforced concrete slab structures, and current design. 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. It is claimed that the cost of formwork, concrete material placement and finishing, and steel placement are 47%, 36%, and 17%, respectively of. Engineered solutions structural plate design guide 7. Flat slab analysis, design and detailing pdf civil. This system is similar to the twoway flat plate system except there is a drop panel to provide extra thickness around the columns. Firstly, the depth depends on the loading conditions and the functional requirement of the building.
Sachpazis date 18012014 chkd by date appd by 1 flat slab design to bs8110. Pdf unified equivalent frame method for flat plate slab structures. The strip may have up to 20 spans and may have cantilevers at the ends. All columns are 230 x 450mm, the grade of concrete f ck is 30 nmm 2, and the yield strength of the reinforcement f yk is 500 nmm 2. Wiesinger proposed to divide the panel into triangular grid and. Therefore, the slab can be reinforced with shear reinforcement complying with detailing rules defined in subclause 7. Must watch basics of flat slab for better understanding from the link given below. These materials are originally located at different websites. 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. For beamless slabs, the choice between a flat slab and a flat plate is usually a matter of loading and span.
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. This example focuses on the analysis of flat plates using efm. The rest of the floor can be slightly thinner with less dead weight. The four test specimens were prepared to model the interior bay flat plate slab column connections in a typical flat plate slab building. Pdf in the construction industry, the need for flat slabs supported on columns in. A civil engineer must know all the aspects regarding the flat floor system. A simplified drawing of a flat slab plate or waffle slab structure adapted from. Pdf irregular flat slabs designed according to the structural. Flat slab is a reinforced concrete slab supported directly by concrete columns without the use of beams. A procedure for carrying out the detailed design of flat slabs is shown in table 1 below. Nancy debora assistant professor civil karunya university 2.
Oneway and twoway slabs university of asia pacific. Flat slab types of flat slab design and its advantages. Jul 28, 2014 the flat plate is a twoway reinforced concrete framing system utilizing a slab of uniform thickness, the simplest of structural shapes. Deep ribs, the concrete and steel quantities are relative low expensive formwork expected. The allowable bearing capacity for the supporting soil is 60 knm 2. 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. Explore flat slab with free download of seminar report and ppt in pdf and doc format. Pdf the equivalent frame method efm is widely used for the design of twoway reinforced concrete slab structures, and current design. The general criteria used for the design, such as details of material properties are given in a separate report entitled structural design criteria.
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. This design is a complete flat plate slab design, from shear to bending along with design of columns and shear head reinforcement. Flat plate design will facilitate the use of big table formwork to increase productivity. Flat slab analysis, design and detailing pdf civil engineering. Slabs without special shear reinforcement two kinds of shear may be critical in the design of flat slabs, flat plates, or footings. Flat plate reinforce concrete slab design architectural engineering senior thesis washington park condominiums final report mt. Drop panels play a significant role here as they augment the. Accordingly, main reinforcement is required in the two directions. 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. 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.
Punching shear always a critical consideration in flat plate design around the columns instead of using thicker section, shear reinforcement in the form of. 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. The thickness of flat slab is 10 percent smaller than that of flat plate for the same span length. Effect of column dimensions on the punching shear of flat slab. 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. 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. Bending will take place in the two directions in a dishlike form. The design i am going to share with you today is design of flat plate slab as by definition. Department of mechanics, materials and structures english.
Twoway flat plate concrete floor system analysis and design cac design handbook. Firstly, one has to check if the design shear force v d is smaller than the maximum punching strength v rd,max. Flat slab seminar report, ppt, pdf for civil engineering. Data obtained can then be used to determine the reliability of analysis and design techniques presently being used in practice. A better understanding of the lateral behavior of flat plates is needed together with more specific design criteria for slabcolumn connections in seismic regions. Twoway flat plate concrete floor system design structurepoint. Blast design procedure for flat slab structures dtic. Flat plate strength is often governed by shear strength at the columns, and for service. Pdf cantilever slab design ramjan shehzaad academia. Twoway flat plate concrete floor system analysis and. Design of flat plate voided concrete slab systems request pdf.
Flat slab system is an important division of concrete floor system. Diagram showing examples of flat plate and flat slabs. This research presents the best reinforced concrete flat slabs that resist burning of low cost and. Design considerations for reinforced concrete flat slab. Punching of flat slabs design for shear at th e column heads 12. Flat plate slab is that in which slab is directly supported on columns without column capital, drop panel or beams. Different types of shear reinforcement used at column heads. Analysis, design and investigation of beams, one and twoway slab systems, flat plate, flat slab, waffle slab and slab bands. All anchor bolt shall have plate wahers a minimum of 2x2x316 thick. The following example illustrates the example building. Flat slabs may have drop panels at columns and columns may have capitals. The following example illustrates the design methods presented in the pca book simplified design. For prestressed construction, the economical span can be increased to 8 to 12m. Jul 12, 2018 how to design a flat slab, step by step explained in this video.
A flat slab is a reinforced concrete slab supported directly by concrete. Design and detailing of flat slab ese soedarsono hs 27 february 2002 content introduction benefits design. Regarding the depth of the slab there is a little contradiction. Flat plate concrete floor system does not use beams between columns or. Request pdf design of flat plate voided concrete slab systems synopsis. Flat slab analysis and design designs beamless concrete slab floors flat slab or waffle slab in accordance with aci 318.
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. 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. Charleson, seismic design for architects, architectural press 2008, p. Design methodology design methodology simplified method table 3. A series of drawings in the appendixes presents basic relations. The floor system is supported by columns of size 500 mm. Analyze and design flat slab or waffle slab floors. The base specimen has no shear reinforcement, and the other. It is desired to design the raft slab shown below to support the column loads for a building as given below. A reinforcedconcrete slab is a broad, flat plate, usually horizontal, with top and bottom surfaces parallel or nearly so.
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. The flat plate is a twoway reinforced concrete framing system utilizing a slab of uniform thickness, the simplest of structural shapes. 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. The behavior of flat slab is investigated in terms of the following factors. Comparison of oneway and twoway slab behavior economic choices oneway slab on beams suitable span 3 to 6m with ll 35knm2. Strength investigation and strengthening of existing floor slabs. The following sections outline the solution per ddm, efm, and spslab software respectively. 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. 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 test specimens were characterized as falling into two groups according to the. Functions well in all applications, but especially in those with high cover x x multiplate. Direct design method ddm for slab systems with or without beams loaded only.
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