Rectangular and circular columns, and also columns with any general shape. The first reinforced concrete design manual formerly titled aci design handbook was developed in accordance with the design provisions of 1963 aci 318 building code by aci committee 340, design. Flat plate slab is that in which slab is directly supported on columns without column capital, drop panel or beams. The slab has to carry a distributed permanent action of 1. Symbol description units a area of column crosssection m2 a, b, c plan dimensions of slab supported on several sides m d dissipation of internal energy knm e. This article highlights a number of engineering, fabrication, and erection considerations that will aid in. Department of mechanics, materials and structures english.
Reinforced concrete design 1 design of slab examples. Because the axial stress developed in the rc counterpart is usually very small. The behaviour and response of flat slab and post tensioned flat slab during earthquake is an important. A flat plate design procedure based on the element force approach was embodied in the. Reinforced concrete slab design using the empirical method bridgesight solutions for the aashto lrfd bridge design specifications bridgesight software tm creators of effective and reliable solutions for the worlds bridge engineers 2688 venado way rescue, ca 95672 phone. The concrete floor slab system shown below is for an intermediate floor to be designed considering partition weight. 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. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. The services can be installed within or below the slab and there are flexibilities in relocating vertical small penetrations. The aim of the project is to learn more about structures behaviour what will help to find new design methods, both computer aided and ready solutions in form of tables and diagrams. The axial force, moments and shears for a particular strip are recovered from the analysis on the basis of the wood armer tech.
Flat slab analysis, design and detailing pdf civil. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. Construction of slab on ground design elements the construction of slab on ground requires certain basic design elements. These materials are originally located at different websites. Reinforced concrete sk 33 section through slab showing stress due to moment.
Flat plate slabs under unbalanced loads, moments and shears are induced in the slab. The prokon suite includes a series of modules for designing concrete elements. Design of concrete structures 14th edition, 2009, by arthur h. Design of slab for flexure 067 m unit width of slab. Direct design method ddm for slab systems with or without beams loaded only. Design, serviceability, fire resistance, and construction flat platevoided concrete slab systems, which have been used for many years in. 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. Fundamentals of post tensioned design for buildings. The locations of the strips are usually governed by the locations of the slab supports. Slab is horizontal plate elements forming floor and roof in building.
Nonlinear dynamic analyses are performed on five typical building systems. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. The base of wsm is the concept of modular ratio, which is the ratio of youngs modulus of steel by youngs modulus of concrete and it is adopted as m. In order to prevent the column from puncturing the slab, appropriate shear reinforcement, slab thicknesses, and column geometries are required. Practical yield line design 2 notation symbols the symbols used in this publication have the following meaning. The soffit is often flat and high ceiling height can be achieved. For the design of the steel plate, the existence of the axial tensile force is usually. Twoway flat plate concrete floor system analysis and design. Design guide 1, 2nd edition base plate and anchor rod design mentary to the aisc seismic provisions notes some signi. Tests of flat plate structures indicate that in most practical cases, the capacity is governed by shear. 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.
In all of these conditions of the slab edges, the four edges are supported and the fixing conditions only are different see fig. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Column base plates are bearing on grout and concrete. A simple seismic design recommendation is proposed for slabcolumn. Flat plate reinforce concrete slab design architectural engineering senior thesis washington park condominiums final report mt. The flat plate system may save money on formwork, but it requires the use of a heavier slab than a flat slab system. A concrete design has been performed on the elements. The traditional approach for the design of pinned bases results in a base plate thickness of sufficient stiffness to ensure a uniform stress under the base plate and therefore the base plate can be modelled as a rigid plate dewolf, 1978. In this paper different conditions of the slab edges are taken the same as are defined in 4 numbered 1 to 9. See below for the reinforcement report for many of those elements. The bending behaviour of a slab is similar to beam. This axial plate force is resisted by the bolt group.
A floor slab has been modeled using 4noded plate elements. It includes material transformations algorithm and optimization of slab selection. Flat plate concrete floor system does not use beams between columns or. The construction and design of concrete slabs on grade d. The design process for plastic voided slab is directly compared with traditional twoway flat plate.
The traditional design of momentresisting column bases. Flat slab system is an important division of concrete floor system. Reinforced concrete, 2014, 9th edition, aci 31811 code edition, by jack c. Introduction concrete slabs on grade are a very common type of concrete construction. Generally, the design of a slab is almost similar to the design of beam. This design is a complete flat plate slab design, from shear to bending along with design of columns and shear head reinforcement. Simple support at all sides ssss appropriate h s 1. Many factors are considered in the model covering the equipment capacity, spread rate, compression rate, burning loss and cutting loss. Development of some design charts for slab, beam, column and flat plate 121 2. Calculating area steel reinforcing reinforced concrete design duration. Engineered solutions structural plate design guide 7 edition.
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. Reinforced concrete design 1 design of slab examples and. To improve the yield rate of steel plates, a method of slab size design is proposed based on maximum yield rate of plates. Design of beam and slab sections for flexure, shear and torsion. Long anchor rods embedded in concrete will strain much more than highstrength bolts or welds in beamtocolumn connections. Nancy debora assistant professor civil karunya university 2. Design of reinforced concrete slab with regard to explosions. Find the following parameters for design moments in step 2 per unit width step 4 note.
Chapter 6 construction method for flat plate system. A civil engineer must know all the aspects regarding the flat floor system. Due to posttensioning of flat plate slab there is no much effect on axial force but shear and moment on column increases. Design slab command, which was implemented in gt strudl. Design, serviceability, fire resistance, and construction article pdf available in practice periodical on structural design and construction 223. Twoway flat plate concrete floor system design structurepoint. Such type of system of design in which we consider the elastic limit in all calculation is termed as working stress method of design. For oneway composite slab, the concrete layer was modelled as a series of two adjacent plate bending elements which had the same properties and different thickness to simulate the depth variation of. 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. The design i am going to share with you today is design of flat plate slab as by definition. In twoway slabs shorter direction strip carry greater %age of load. Reinforced concrete slab design using the empirical method.
The hand solution from efm is also used for a detailed comparison with the reference results using. Around the columns, the shear stresses create a high risk for punching shear. The construction and design of concrete slabs on grade. Functions well in all applications, but especially in those with high cover x x multi plate. Asce, secb course content slab on grades construction. Analysis and design of slabs two way civil engineers pk.
The use of prefabricated reinforcement for slab is recommended to achieve higher productivity on site. 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. Method of slab size design based on maximum yield rate of. These design elements must be enlisted and added in the contract documents by the designer in charge before asking for a bidding.
The formwork for slab can be recycled with repetition in floor layout. The use of bolted steel plates for strengthening of. Foreword the reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. Slab is a structural element with small overall depththickness h as compared to the width b and its span l. Design calculator for quick estimation of concrete and. Lec 3 design problem of flat plate slab linkedin slideshare. The elements are subjected to pressure loading in the vertically downward direction. Design calculations instafooting load bearing capacities on concrete slab january 14, 2017 rev.
Slab load transfer to the beams and then in to the columns. The design of the slab or footing for twoway action is based on eq. Construction of slabs on ground design considerations aci. Development of some design charts for slab, beam, column. Microsoft excel is used to house the database as per the design method and respective aci code. Two types of shear may be critical in the design of the flat slabs. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Preliminary design of slab thickness thickness design depends on boundary conditions supports. Part three we will now continue with the study of twoway, posttensioned slab systems, including a complete design example using the equivalent frame concept.
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