Pdf analysis and design of flat slab and grid slab and. Analysis and design of flat slab and grid slab and their. Pdf analytical study on economic effect of grid floor geometric. Concrete design procedures generally follow the strength design method contained in aci318, although certain aspects of the procedures may be considered conservative relative to conventional residential foundation applications. The top of ribbed slab is normally thin and the bottom grid lines are generally ribs which are laid perpendicular to each other with equal depth. Reinforced concrete sk 33 section through slab showing stress due to moment. These materials are originally located at different websites. Wsd, ii usd to design the twoway slab shown below, carrying floor finish 30 psf, random wall 50 psf and live load 60 psf given. The benefits associated with flat slab construction may well outweigh those. The design procedure set forth in that publication had at that time been in use by the author for about 15 years.
The ribbed slab system can be analyzed as solid slab if structure satisfies following requirements. Floor layers figure 4 a crosssection of the slab table 1 flooring layers i the figure layer height unit 1 floor covering carpet, laminate, etc. From start to finish, from inception of the design to the commissioning, viega was there by our side, said paul redgate, pipe fitting superintendent for california comfort systems. Eliminating drops results in simpler falsework and formwork arrangements, enabling rapid floor construction and giving maximum flexibility to the occupier.
Following are the rcc slab design and detailing guidelines. Comparison of various methods of analysis of grid floor frame prof. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. What is the difference between grid floor system and beam. These slabs are used to cover a large column free area and therefore are good choice for public assembly halls. Analysis and design of grid slab in building using. These slabs are used to cover a large column free area. For structural engineers and architects, basheer bava, bsbg lead structural engineer, provides an indispensable guide on the twoway concrete flooring system. Reinforced concrete design 1 design of slab examples. At ground floor, slabs are not provided and the floor will directly rest on ground. Guidelines for a twoway concrete flooring system brewer.
Pdf analysis and design of flat slab and grid slab and their. An assembly of intersecting beams placed at regular interval and interconnected to a slab of nominal thickness is known as grid floor or waffle floor. Analysis and design of multistory building with grid slab. Grid beams are provided in both the directions say x and y direction.
The flat slab system of construction is one in which the beam is used in the conventional methods of construction done away with the directly rests on column and the load from the slabs is directly transferred to the columns and then to the. A civil engineer must know all the aspects regarding the flat floor system. After this publication, it was subsequently adopted by the uniform building. In this work an attempt is made to evaluate safety of grid slabs for a square and rectangular floor area with varying rib width under different design situations by. It was also the first time they worked handinhand with viega for the design of a project. Firstsecondthird floor slab top reinforcement plan. Grid slab an assembly of intersecting beams placed at regular interval and interconnected to a slab of nominal thickness is known as grid floor or waffle floor. Twoway joist concrete slab floor waffle slab system analysis and design design the concrete floor slab system shown below for an intermediate floor with partition weight of 50 psf, and unfactored live load of 100 psf. Design of slab for flexure 067 m unit width of slab. The floor system is the major part of a building structure, and the selection of an appropriate system. Shear strength of beamless slabs usually a controlling factor. The width of the in situ ribs should be not less than 65 mm.
Comparative analysis and design of flat and grid slab. The bending moment, the shear force and the mid span deflection developed in grid floor beams have been predicted by conventional and numerical methods and. Analysis and design of multistory building with grid slab using. The analysis and design of slab system is done as per is 4562000 and is 19832002. Freeaxez is here to provide design, technical, and maintenance support and answer. The use of ribs to the soffit of the slab reduces the quantity of concrete and. Effect of spacing of grid beam and its depth on peripheral. Pdf automated layout design of beamslab floors using a. For this reason, some supplemental design guidance is provided when practical and technically justified. This is the compilation of the presentations available for grid slabs on. Reinforced concrete slab design and detailing guide is456. J rinu isah 1,2 assistant professor department of civil engineering, bist,bharath institute of higher education and rese arch biher, bharath university, chennai 600073.
Grid slab floor system an assembly of intersecting beams placed at regular interval and interconnected to a slab of nominal thickness is known as grid floor or waffle floor. Waffle slab can be used as both ceiling and floor slab. The overall depth of the floor typically varies from 300 to 600 mm with overall spans of up to 15 m if reinforced, longer if posttensioned. Concrete floor slabs on grade are subjected to a varie ty of loads and loading conditions. Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for oneway and twoway slabs as per is 456. Part 1 to 3 code of practice for design loads other than earthquake for buildings and structures. International journal of pure and applied mathematics. Firstsecondthird floor slab bottom reinforcement plan. The primary design issues for stiffened slabs on grade are the sizing of the beams that stiffened the slab and the spacing of the beams. Analysis and design of flat slab and grid slab and their cost comparison. The minimum thickness can be determined by many factors.
Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Construction type continuous span simple span roof floor roof floor oneway solid slabs 50 45 45 40 twoway solid slabs 4548 4045 na na beams 35 30 30 26 oneway joists 42 38 38 35 typically tendons are located near the bottom fiber at positive moment regions and near the top. Freeaxez can assist with preliminary installation plans. Keywordsgrid floor, peripheral beam, grid beam, spacing of grid beams, size of beams. Comparison of various methods of analysis of grid floor frame. The slab has to carry a distributed permanent action of 1. The choice of the particular deck type to use can depend on several factors, which may include the specific application. Various approachesavailable for the analysis of grid floor frame, are as listed below. They are used in the areas where less number of columns are provided, i.
Reinforced concrete design 1 design of slab examples and. The slab itself is usually set at a thickness of 0. Waffle slab or ribbed slab construction procedure and. Keywords structure design and analysis of slab system, flat slab system, grid slab system, conventional. The thickness of a floor slab must be determined early in design because the weight of the slab is an important part of the dead load of the structure. Grid floor systems consisting of beams spaced at regular intervals in perpendicular directions, monolithic with slab. A light top mesh over the grid is generally the only top reinforcement at the interior of the floor panels. Commercial building structural design and analysis major. Slab depths typically vary from 75 to 125 mm and rib widths from 125 to 200 mm. However, greater efficiency can be achieved by designing the flooring as one integral slab and analysis and design of multistory building with grid slab using etabs ch. Twoway joist concrete slab floor waffle slab system.
There is a very narrow line in differenting the two systems. Find the following parameters for design moments in step 2 per unit width step 4 note. Design of the slab system is done for different spacing grid size of column to find out which grid size of the column or plan area which slab is economical. Analysis of the flat slab and grid slab has been done both manually by is 4562000 and by using software also. Unlike traditional raised floors, gridds simple and revolutionary design is a raised floor system that easily adapts to the changing growth of your business. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Grid is highly redundant structural system and therefore statically indeterminate.
Gridd is a paradigm shift in thinking about raised flooring. Oneway and twoway slabs university of asia pacific. In this video etabs2016concrete floor slab design, we show you how to design concrete floor slab in csi etabs 2016, in this video will detail you about the. Flat grid or waffle system sinhagad college of architecture this presentation is compiled by. Concrete volumes and slab design data 81 concrete slabs on form deck 82 83 ufs, uf1x, ufx, uf2x maximum span and cantilever tables 84 slab and reinforcement data 85 fire resistance ratings 86 sdi long form specifications 87 91 introduction 92 diaphragm design example 93 typical fastener layout 94 1. The design procedure separately incl udes determining thickness of slab under wall load. The plank and beam system described above is the simplest system for creating flat, horizontal surfaces. The design procedure includes determini ng slab thickness based on moving live loads and then checking adequacy of slab thickness for stationary live load. The supports in the grid beams are provided in the periphery beams. Browse the available gridd bim product families, then download and save for use in revit. The structure is monolithic in nature and has more stiffness. This new system they invented is called the holedeck. Master of science and hereby certify that, in their opinion, it is worthy of acceptance.
For spans over 9 m posttensioning should be considered. Waffle slab or ribbed slab is a structural component which is plain on its top and contains grid like system on its bottom surface. Flat slab and grid slab has been analyzed by staad pro. Comparison of various methods of analysis of grid floor frame ijesi. Flat slab system is an important division of concrete floor system. Bridge approach slab analysis and design incorporating elastic soil support presented by. The lateral loads are independently resisted by shear walls.
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