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