Longterm deflection of reinforced concrete flat slabs and plates. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Flat slab structure is more economical than that of conventional slab structure. Explore flat slab with free download of seminar report and ppt in pdf and doc format. Design the flat plate using section cut techniques in sap2000. Preliminary design of slab thickness thickness design depends on boundary conditions supports. Flat slab structure leads to economic saving, aesthetic view. Frequently asked questions about flat plate voided. Since the flat plate is symmetrical in two directions, one needs to define section cuts in one direction and for half the slab. Weight of flat slab structure is quite low as compared to conventional slab structure. Slab thickness a flat plate floor system is a twoway concrete slab of uniform depth without interior beams, drop panels or. Twoway flat plate concrete floor system design structurepoint.
This type of failure tends to be catastrophic and therefore the shear strength of the slab at column supports must be examined very carefully. Simple support at all sides ssss appropriate h s 1. Flat slab construction system vs flat plate system tad. Punching shear analysis of reinforced concrete flat plates. This steel tray improves strength of the slab, and prevents the slab from bending under its. 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.
Development of some design charts for slab, beam, column and. A flat plate is a one or twoway system usually supported directly on columns or load bearing walls. P7 moments and reactions for rectangular plates by w. Pdf downloads free technical notes technical note etnb417 14 pp 2017. Slabcolumn sub assemblages, modelled after a reinforced concrete flat plate building, are tested under combined gravity and lateral loads. Flat slab subduction is associated with basementcored uplifts also known as thickskinned deformation of the overriding plate like the sierra pampeanas in south america possibly associated with the subduction of the juan fernandez ridge. Effects of openings on the punching shear strength of rc flat. Around the columns, the shear stresses create a high risk for punching shear. Comparative study of post tensioned and rcc flat slab in. Advantages and disadvantages of flat slabs civil engineering. The assembly is designed for seismic zone 2 and may be used for structures up to 8 storeys. Flat slab analysis, design and detailing pdf civil. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place.
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. Fundamentals of post tensioned design for buildings. A water resources technical publication engineering monograph no. The research presented in this paper analytically examines the fire performance of flat plate buildings. Punching shear damage to the connections may occur during construction or post moderate earthquakes. To study the effectiveness of all these models, the plate center stresses, plate corner stresses, flat plate principal. Structural performance of reinforced concrete flat plate.
The use of prefabricated reinforcement for slab is recommended to achieve higher productivity on site. In general, thinner slabs not only save on direct material costs for the frame and the supporting foundations but also provide knockon benefits in terms of reduced height of the structure and lower cladding costs. Drop panels play a significant role here as they augment the. Using the proposed finite element model, the punching shear behavior of slab column connections is shown to be adequately simulated.
Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensusbased standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design. A civil engineer should have clear and concise ideas on all the features of the flat floor system. Think well need some additional framing members load path framing possibilities ln 4. A flat slab is a oneway or twoway system with thickenings in the slab at the columns and load bearing walls called drop panels. Radial cracking in reinforced concrete flat plate slabs. Twoway flat plate concrete floor system analysis and design.
Analysis and design of flat slab with and without shear wall. Concrete in practice 11 curing inplace concrete pdf. Asce, secb course content flat plate and flat slab systems flat plates. Flat plate slab design using section cut in sap2000 civil. Frequently asked questions about flat plate voided concrete slab systems resource types. 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. Flat plate slab is that in which slab is directly supported on columns without column capital, drop panel or beams. Reinforced concrete flat slabs are commonly used in construction as they provide a number of benefits to the designer including.
Reinforced concrete design s u r a n a r e e institute of engineering university of technology school of civil engineering design of slabs. Nmh aci sp30 1971moment and shear transfer to columnsw. The modeling parameters for the mechanical and thermal properties of materials are calibrated from relevant test data to minimize the uncertainties involved in analysis. Comparative study of flat slab with old traditional two way slab. The concrete floor slab system shown below is for an intermediate floor to be designed considering partition weight. Raut, 7 2015 the flat plate system has been adopted in many buildings construction taking advantage of the reduced floor height to meet the economical and architectural demands. Chapter 6 construction method for flat plate system. The slab is loaded by self weight of the slab and live load of 5 knm2.
Slab load transfer to the beams and then in to the columns. Comparative study of reinforced concrete flat slabs with. The calibrated models are then adopted to perform a nonlinear finite element simulation on a flat plate building. Roof width must be greater than zero for all loads. Crsi routinely receives inquiries concerning various aspects on the design and construction of flat plate voided concrete slab systems. 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. Add or modify a concrete flat plate slab on columns roof system.
In order to prevent the column from puncturing the slab, appropriate shear reinforcement, slab thicknesses, and column geometries are required. The load paths for both the flat plate and the edgesupported slabs are, however, essentially the same. Flat slab seminar report, ppt, pdf for civil engineering. Consider a reinforced concrete flat plate rested over 3m high columns. Flat slabs are thought to result in zones of broad, diffuse deformation in the upper plate located far landward from the trench. A civil engineer must know all the aspects regarding the flat floor system. Flat slab subduction is characterized by a low subduction angle conventionally reinforced, concrete flat slab and flat plate construction and design d. The behaviour and response of flat slab and post tensioned flat slab during earthquake is an important aspect which needs to be explored. The flat plate is a twoway reinforced concrete framing system utilizing a slab of uniform thickness, the simplest of structural shapes. It is one of the most common forms of construction of floors in buildings. A concrete slab is a common structural element of modern buildings, consisting of a flat. Flat slab is a reinforced concrete slab supported directly by concrete columns without the use of beams. Flat slab system is an important division of concrete floor system.
Nmh aci sp42 1974 moment transfer with shearheads w. A floor slab also called plate slab or filigree slab is a reinforced concrete slab with a minimum thickness of 56 cm. The formwork for slab can be recycled with repetition in floor layout. Department of mechanics, materials and structures english.
Flat slab types of flat slab design and its advantages. Alternatively, designers may introduce hidden beam within slab along column strip to cater for the shear stresses near column location. 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. Thin sections allowing for greater roof heights and lighter floors. Flat slab, or more accurately flat plate the slab is. Flat platevoided concrete slab systems, which have been used for many years in europe and other parts of the world, are becoming increasingly popular in the united states because of their many inherent benefits. Flat slab construction reinforced concrete flat slab design. Reinforced concrete flat plate slabs and slabs with drop panels often exhibit radial cracking in the vicinity of column supports under normal serviceconstruction loading. 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. Nancy debora assistant professor civil karunya university 2.
Flat slab analysis, design and detailing pdf civil engineering. 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. Jul 28, 2014 the flat plate is a twoway reinforced concrete framing system utilizing a slab of uniform thickness, the simplest of structural shapes. Comparative study of post tensioned and rcc flat slab in multistorey commercial building jnanesh reddy r k1, pradeep a r2. This design is a complete flat plate slab design, from shear to bending along with design of columns and shear head reinforcement. Development of some design charts for slab, beam, column and flat plate 121 2. Introduction to flat slabs modelling of reinforced concrete. A flat plate system is a oneway or twoway system usually supported directly on columns or load bearing walls. The flat plate system may save money on formwork, but it requires the use of a heavier slab than a flat slab system. Column slab connections in flat plate structures are critical part of the structure. The structure consists of two bays in xdirection and two bays in ydirection. The concrete floor slab system shown below is for an intermediate floor to be. Flat plate reinforce concrete slab design architectural engineering senior thesis washington park condominiums final report mt.
Go through the following image to gather various information on flat slab floor system which can optimize the structural engineering process for a civil engineer. Testing and analysis of flat plate and flat slab system shear strengths aci journal sept. Study on flat slab and conventional slab mitan kathrotiya1 dr. This flat plate slab design is hand written involving each step by step. A two way spanning concrete slab roof typically supported on concrete columns. Flat plate concrete floor system does not use beams between columns or. Flat slab system is a vital part of concrete floor system. Types of slab oneway slab oneway slab twoway slab flat plate slab flat slab grid slab. In present study, flat slab system of 10,20and30 stories without shear wall and the flat slab system with shear wall of 10,20and30 stories having varying thicknesses of shear wall are compared. 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. Flat plate concrete floor system does not use beams between columns or drop panels and it is usually suited.
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