Punching of flat slabs design for shear at th e column heads. 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 beamless slabs, the choice between a flat slab and a flat plate is usually a matter of loading and span. Surveying, the first step of starting a new civil engineering project, is a very important branch of civil engineering. Correlation between division 3 floor flatness ff and. International journal of intellectual advancements and. Flat slabs carried on columns and edge beams or walls with no interior beams. We also show how a bump cutter works as well as floating pans to. 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. We have qualified engineers with years of experience in precast slab systems.
The trun function truncates the calculated value to a single n ltrunc interger ie 3. For lighter loads the column heads and drop panels are eliminated, such flat slab with constant thickness supported on prismatic columns are called flat plate. For carrying out this project an interior panel of a flat slab with dimensions 6. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. The beams reduce the available net clear ceiling height. Analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. How to get back to normal, using design to fight the pandemic, more mask. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. A flat slab is a twoway reinforced concrete slab that usually does not have beams. Super flat concrete leveling with the dustram system. Concept designs prepared assuming detailed design would be to bs 8110 may be continued through to detailed design using eurocode 2. Blast design procedure for flat slab structures dtic. Through this technical paper, a process for estimating a. Rectangular and circular columns, and also columns with any general shape.
This section evaluates the current roof deck and support systems capacity to carry this. A civil engineer should study these lectures and materials for structural engineering acumen. How to estimate the cost of highrise cast in place flat. Today, the flat plate form is preferred for light loads and short spans. Superflat floor meets warehouse needs concrete construction. Department of mechanics, materials and structures english. Oneway and twoway slabs university of asia pacific. This assumes that the slab thickness has previously been determined during conceptual design. Sachpazis date 18012014 chkd by date appd by 1 flat slab design to bs8110. In case of unsafe hidden beam design reframe the plan or revise slab depth or column size or concrete grade. Flat slab types, uses, advantages and disadvantages.
This video shows ways to bring a concrete truck in through sand and not get stuck. Design of beam and slab sections for flexure, shear and torsion. The four corners of the slab panel are supported, e. The prokon suite includes a series of modules for designing concrete elements. The design loads, required spans, serviceability requirements, and strength requirements are all important. Flat slab analysis and design designs beamless concrete slab floors flat slab or waffle slab in accordance with aci 318.
The fmin system is based upon defining the maximum variation in a floor surface for a particular lift truck. 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. The slab is designed based on 1foot strips, therefore the live load most be distributed to these strips. Design considerations for reinforced concrete flat slab floor system harshal deshpande1, radhika joshi2. The fmin system is based upon defining the maximum variation in a floor surface for a. Seismic codes are also silent on the design of flat slab. Slabs are constructed to provide flat surfaces, usually horizontal, in building. Flat slab analysis, design and detailing pdf civil engineering. Sep 14, 2016 trimble is an international company focusing on positioningrelated technology for different industries. This paper presents the design of an 80story reinforced concrete rc highrise building using 200 mpa ultrahighstrength concrete. Often equated to the bones of a building, flat slab concrete systems are the structural system of the building.
To understand the techniques of surveying a student must carefully study the bas. For carrying out this study an interior panel of a flat slab with dimensions 6. How to pour a flat concrete slab texas barndominiums. Flat slab analysis and design free version download for pc. The thickness of slab over columns is also increased to support heavy loads and the thickened part of the slab is called drop panel. Explore flat slab with free download of seminar report and ppt in pdf and doc format.
In this chapter information about the building site and the building structure are combined and used to determine the size of footings, reinforcing for the foundation, and the size and spacing of anchorage used to tie the unit to the foundation. The benefits of using insitu concrete flat slab construction should be investigated at the conceptual design stage. Tekla software solutions for advanced building information modeling and structural engineering are part of trimble offering. Floor depth for preliminary design the general loadspan graphs in figures 2to 7 can be used to determine a suitable plank depth. N number of lanes, the interger part of w rdwy12 3.
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. Tacheometry is a branch of angular surveying in which the horizontal and vertical distances are obtained by optical means as opposed to the ordinary process of chain and tape. Design of flat slab with edge beams by direct design method 16 14 14 3 b c 1 c 2 c 3 c 4 3 1 c 5 c. We have qualified engineers with years of experience in. The slab thickness may need to be increased if deflection and vibration are critical such as when there are sustained live loads, rhythmic action, masonry partitions or a large number of openings. Slab and girder bridges are used when the economical span limit of solid slab bridges is exceeded. Flat slab is a reinforced concrete slab supported directly by concrete columns without.
Design of flat slab with edge beams by direct design method 16 14 14 3 b c 1 c 2 c 3 c 4 3 1 c 5 c 6 c 7 c 8 c 9 14 c 10 11 c c 12. Nov 24, 2018 design a slab culvert for two lane national highway using the loading conditions as class a tracked vehicle for the following data. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Salunke mgms college of engineering and technology, kamothe, india mgms college of engineering and technology, kamothe, india abstract the use of posttensioned flat slab is increasing day by day, due to its advantages over traditional concrete. 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. One way slab bends in one direction and two way slab bends on both the directions. Flat slab sized for punching shear and deflection additional reinforcement added to span steel to reduce deflections typically 25% extra on a 7. A procedure for carrying out the detailed design of flat slabs is shown in table 1 below.
Flat slab is defined as one sided or twosided support system with sheer load of the slab being. Trimble is an international company focusing on positioningrelated technology for different industries. Department of mechanics, materials and structures english courses. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. Superflat floors concrete floor contractors association of. In case of slab s 2, the design for panel 2 is similar to the design for panel 1 for slab s 1 and slab s 3, moment of inertia of edge slab, i s.
Flat plate concrete floor system does not use beams between columns or. For purposes of analysis and design, a unit strip of such a slab cut out at right angles to the supporting beams, as in figure 2, may be considered as. 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. To obtained a live load per foot divide the lane load and truck loads by the effective width.
Design considerations for reinforced concrete flat slab floor. Flat slab cast in place concrete is one of the most important systems a core and shell estimator must complete for a high rise building. The benefits of using insitu concrete flat slab construction should be. Superflat floors are constructed to far tighter tolerances than conventional floor slabs using a specialized tolerance system call the fmin f minimum tolerance system. Super flat floors are appropriate for very limited applications with random traffic.
Flat slab types of flat slab design and its advantages flat slab is a reinforced concrete slab supported directly by concrete columns without the use of beams. The benefits associated with flat slab construction may well outweigh those of other structural solutions, which could be more complicated, timeconsuming and ultimately more costly. Analysis of posttensioned flat slab by using safe shriraj s. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. The quality of a concrete floor or slab is highly dependent on achieving a hard and durable surface that is flat, relatively free of cracks, and at the proper grade and elevation. They may be supported on two opposite sides only fig. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. Properties of the surface are determined by the mixture proportions and the quality of the concreting and jointing operations. Steps to placing a superflat floor concrete construction magazine. Super flat na na table 1 floor flatness tolerance compliance correlation between division 3 floor flatness f f and floor levelness f l and division 9 substrate tolerances tds 233. General overview of posttensioned concrete design instructor. Punching of flat slabs design for shear at th e column heads 12. Structural analysis the addition of a green roof to the slcc imposes additional gravity loads on the structure.
To limit the deflection of a floor slab and its sensitivity to vibration, the ratio of span to overall depth is usually kept in the range of 3035 but can be up to 40. After reading this article you will learn about the design of slab and girder bridges. 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 slab analysis, design and detailing pdf civil. Flat slab types of flat slab design and its advantages. The conclusion to include an extensive green roof imposes a minimum superimposed dead load of 25 pounds per square foot dc greenworks. Super slabs gauteng is one of south africas largest slab suppliers. Pdf in a developing country like india the benefits of posttensioning system are yet to be recognized. Slabs and flat slabs lecture 5 19 th october 2016 contents lecture 5 designing for shear in slabs including punching shear detailing solid slabs flat slab design includes flexure worked example exercise punching shear.
These materials are originally located at different websites. Design and detailing of rectangular flat slab panels. Superflat floors concrete floor contractors association. The success of super slabs can be attributed to the effective combination of superlative products and dedicated service excellence. Design a slab culvert for two lane national highway using the loading conditions as class a tracked vehicle for the following data. In general, the design of slab become more simpler because compression. Nancy debora assistant professor civil karunya university 2. Because subgrade soil conditions were poor and the owner wanted jointfree lifttruck aisles, the design build contractor designed a 16inchthick continuously reinforced concrete floor, locating all construction joints under the designated storage rack locations and eliminating transverse contraction joints. Flat plate strength is often governed by shear strength at the columns, and for service. It was found that a certain amount of poor design was prevalent, and the. Flat slab analysis and design pdf flat slab design pdf 1. Different types of shear reinforcement used at column.
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