This axial plate force is resisted by the bolt group. Chapter 6 construction method for flat plate system. The locations of the strips are usually governed by the locations of the slab supports. Calculating area steel reinforcing reinforced concrete design duration. 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. The use of prefabricated reinforcement for slab is recommended to achieve higher productivity on site. Reinforced concrete slab design using the empirical method. 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.
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. A floor slab has been modeled using 4noded plate elements. The services can be installed within or below the slab and there are flexibilities in relocating vertical small penetrations. Asce, secb course content slab on grades construction. 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 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. Simple support at all sides ssss appropriate h s 1. Development of some design charts for slab, beam, column and flat plate 121 2. A flat plate design procedure based on the element force approach was embodied in the.
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. Twoway flat plate concrete floor system analysis and design. See below for the reinforcement report for many of those elements. Tests of flat plate structures indicate that in most practical cases, the capacity is governed by shear. Many factors are considered in the model covering the equipment capacity, spread rate, compression rate, burning loss and cutting loss. Design calculations instafooting load bearing capacities on concrete slab january 14, 2017 rev. A concrete design has been performed on the elements. Two types of shear may be critical in the design of the flat slabs. In order to prevent the column from puncturing the slab, appropriate shear reinforcement, slab thicknesses, and column geometries are required. 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.
Department of mechanics, materials and structures english. Fundamentals of post tensioned design for buildings. Slab is horizontal plate elements forming floor and roof in building. Long anchor rods embedded in concrete will strain much more than highstrength bolts or welds in beamtocolumn connections. Find the following parameters for design moments in step 2 per unit width step 4 note. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. The prokon suite includes a series of modules for designing concrete elements. Part three we will now continue with the study of twoway, posttensioned slab systems, including a complete design example using the equivalent frame concept. It includes material transformations algorithm and optimization of slab selection. Generally, the design of a slab is almost similar to the design of beam. The slab has to carry a distributed permanent action of 1. This article highlights a number of engineering, fabrication, and erection considerations that will aid in.
Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. The hand solution from efm is also used for a detailed comparison with the reference results using. Design calculator for quick estimation of concrete and. Design, serviceability, fire resistance, and construction article pdf available in practice periodical on structural design and construction 223. Preliminary design of slab thickness thickness design depends on boundary conditions supports. The elements are subjected to pressure loading in the vertically downward direction.
Design of slab for flexure 067 m unit width of slab. The traditional design of momentresisting column bases. 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. Flat plate reinforce concrete slab design architectural engineering senior thesis washington park condominiums final report mt. Development of some design charts for slab, beam, column.
A civil engineer must know all the aspects regarding the flat floor system. The use of bolted steel plates for strengthening of. Design guide 1, 2nd edition base plate and anchor rod design mentary to the aisc seismic provisions notes some signi. Practical yield line design 2 notation symbols the symbols used in this publication have the following meaning. Slab is a structural element with small overall depththickness h as compared to the width b and its span l. Such type of system of design in which we consider the elastic limit in all calculation is termed as working stress method of design.
Introduction concrete slabs on grade are a very common type of concrete construction. In all of these conditions of the slab edges, the four edges are supported and the fixing conditions only are different see fig. The design process for plastic voided slab is directly compared with traditional twoway flat plate. 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. 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 slab system is an important division of concrete floor system. A simple seismic design recommendation is proposed for slabcolumn. Reinforced concrete design 1 design of slab examples. These design elements must be enlisted and added in the contract documents by the designer in charge before asking for a bidding. 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. Design slab command, which was implemented in gt strudl. The concrete floor slab system shown below is for an intermediate floor to be designed considering partition weight. Rectangular and circular columns, and also columns with any general shape. Column base plates are bearing on grout and concrete.
Reinforced concrete design 1 design of slab examples and. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Reinforced concrete sk 33 section through slab showing stress due to moment. Microsoft excel is used to house the database as per the design method and respective aci code. For the design of the steel plate, the existence of the axial tensile force is usually. Because the axial stress developed in the rc counterpart is usually very small. Design of beam and slab sections for flexure, shear and torsion. In this paper different conditions of the slab edges are taken the same as are defined in 4 numbered 1 to 9.
Functions well in all applications, but especially in those with high cover x x multi plate. Design of reinforced concrete slab with regard to explosions. In twoway slabs shorter direction strip carry greater %age of load. Engineered solutions structural plate design guide 7 edition. 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. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. The design of the slab or footing for twoway action is based on eq.
Construction of slabs on ground design considerations aci. Nonlinear dynamic analyses are performed on five typical building systems. The bending behaviour of a slab is similar to beam. The axial force, moments and shears for a particular strip are recovered from the analysis on the basis of the wood armer tech. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. These materials are originally located at different websites.
Method of slab size design based on maximum yield rate of. The formwork for slab can be recycled with repetition in floor layout. Lec 3 design problem of flat plate slab linkedin slideshare. Direct design method ddm for slab systems with or without beams loaded only. The construction and design of concrete slabs on grade d. Around the columns, the shear stresses create a high risk for punching shear. Due to posttensioning of flat plate slab there is no much effect on axial force but shear and moment on column increases. The design i am going to share with you today is design of flat plate slab as by definition. 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. This design is a complete flat plate slab design, from shear to bending along with design of columns and shear head reinforcement. Reinforced concrete, 2014, 9th edition, aci 31811 code edition, by jack c. Design, serviceability, fire resistance, and construction flat platevoided concrete slab systems, which have been used for many years in.
To improve the yield rate of steel plates, a method of slab size design is proposed based on maximum yield rate of plates. Flat plate slabs under unbalanced loads, moments and shears are induced in the slab. Analysis and design of slabs two way civil engineers pk. Twoway flat plate concrete floor system design structurepoint. Twoway slabs have two way bending unlike oneway slab. 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. The behaviour and response of flat slab and post tensioned flat slab during earthquake is an important. Slab load transfer to the beams and then in to the columns. Construction of slab on ground design elements the construction of slab on ground requires certain basic design elements. The flat plate system may save money on formwork, but it requires the use of a heavier slab than a flat slab system. Flat plate slab is that in which slab is directly supported on columns without column capital, drop panel or beams.
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