Abstract paper presents analysis of flat slab with drop panel subjected to realistic concentrated loadings trapezoidal load, line load and patch load. The slab is now designed by a hand analysis to bs8110. This paper presents finite element analysis of slabcolumn connection in. A threedimensional finite element method is used to perform the analysis. 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. Therefore, three types of cft column with flat plate slab connections were initially proposed. Finite element analysis of impactperforated reinforced. Keywords soil structure interaction, stresses distribution, modulus of sub grade reaction ks. The objective of this study was the development of a procedure in gt strudl to design reinforced concrete flat plate systems based on the results. 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. Punching shear failure is a major problem encountered in the design of reinforced. In this research, finite element analyses have been carried out to predict how much seismic loading a flat slabcolumn connection can endure. Thus it is necessary to design them in such a way that keeping the economy in minds the strength of slabs can be increased. Pdf finite element implementation of punching shear behaviors in.
Pdf finite element analysis of effect of punching shear in. The field is the domain of interest and most often represents a physical structure. The corresponding design equation was then proposed based on. In this study finite element analysis of the flat slabs is proposed. Aug 01, 2018 how to design reinforced concrete flat slabs using finite element analysis. Finite element analysis of effect of punching shear in flat slab using ansys 16. Finite element implementation of punching shear behaviors.
Pdf understanding the behavior of flat slab by linear. In this model, structural analysis is defined as nonlinear static type and materials has been. Parametric study of flat slab with various loading types. Boundary value problems are also called field problems. Studies that followed attempted to represent discrete cracks that occur during a load cycle, but the need to change the topology of the finite element mesh greatly hindered the speed of the process. Validation of the developed numerical model was carried out by means of comparisons with test results. Nonlinear finite element analysis has become very useful in modelling complicated structural systems and their behaviour. Pdf finite element analysis of effect of punching shear. Punching shear analysis of reinforced concrete flat plates. 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. The procedure is validated for a largescale reinforced concrete flat slab without shear reinforcement that failed in punching. Finite element analysis and optimization of bonded post.
Ngo and scordelis 1967 presented the first finite element analysis of reinforced concrete that included the effect of cracking. Numerical analysis of a reinforced concrete slabcolumn. Katti2 1pg student, department of civil engineering,sapkal knlowedge hub college of engineering,nashik. If cracking has to be avoided, an elastic method of analysis, i. Our software has plate and shell elements and automeshing facilities, allowing us to analyse the most complex of shapes. Optimization techniques may be effective in finding alternative design of posttensioned slabs to improve their mechanical behaviour, particularly reducing the bending moments.
Then i created one slab for each panel and i got a moment map that satisfied me. Most finite element programs are based on elastic moment distribution and material that obey hookes law. The method requires solving many algebraic equations simultaneously, which is completed with the aid of a computer. Finite element implementation of punching shear behaviors in. The simplest type of twoway slab is known as a flat plate. Finite element analysis is useful numerical technique to solve various structural problems.
Guide to the design and construction of reinforced concrete. In accordance to such research, the lfem is an effective tool in global analysis and. Initial developments in the area of interval arithmetic will be discussed. These elements have a simple geometry and are easier to analyze. Finite element fe analysis, is a popular powerful computer method of analysing flat slab concrete structures. Use of finiteelement fe analysis has particular advantages when the floor has irregular supports or geometry, large openings or carries concentrated heavy loads. This publication seeks to introduce fe methods, explain how concrete can be successfully modelled and how to interpret the results. Different models of the flat slab are analysed by finite element. The lateral loads are independently resisted by shear walls. Within this framework, several aspects should be investigated such as the loaddeformation response of the slab, the failure mechanism, and the load contribution of the shear reinforcement. Finite element analysis in software safe of rectangular flat slab panels under gravity loads is carried out for the different panel aspect ratio 1.
In consideration of the economy and constructability of the connections, a final detail was adopted. In order to simplify the analysis and to be able to use the superposition principle for evaluating the effect of load combinations, linear analysis is generally adopted even though concrete slabs normally have a pronounced nonlinear response. Fem is a powerful tool used in the analysis of flat slabs. Comparative study of reinforced concrete flat slabs with. Mohammed 1, nildem taysi, dia eddin nassani2 and ali k. Analysis of flat slab with and without opening international. Finite element analysis of effect of punching shear in flat. Recommendations for finite element analysis for the design. Finite element analysis fea we have facilities for the production of finite element analysis fea calculations in all materials. A nonlinear three dimensional finite element analysis has been used to conduct an analytical investigation on the overall behavior of reinforced concrete flat slabs.
Guide to the design and construction of reinforced. The finite element method is commonly used to design the reinforcement in concrete slabs. 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. In this paper fea model of slab column connection is model using ansys 16. The development of a linear numerical model of flatplate to predict shear stress distribution around slab column connection is presented in this paper. Punching shear, nonlinear analysis, finite element analysis, reinforced concrete, flat plate, 3dimension compression steel. This publication seeks to introduce fe methods, explain how concrete can be successfully modelled and how to. Com parison of designing flat slabs using finite elem ent analysis.
Our software has an automated module which reads the stresses in the finite element analysis output for the slab being designed, and details reinforcement in accordance with the stresses such that reinforcement placed in the slab is at an absolute minimum. Also highlights the benefits, and some of the common pitfalls of fe analysis, and gives guidance on best practice. Comparative study of reinforced concrete flat slabs with and. Finite element analysis of rc slab with or without opening. An analytical procedure is presented for simulating punching failure. Compared to other counterparts, flat slabs are twoway slabs that are widely used due to their numerous advantages. Department of mechanics, materials and structures english. A reinforced concrete rc flat slab is a twoway structural element, which carries vertical and horizontal loads, and transfers them directly to the. Pdf shear stress distribution of flatplate using finite.
Introduces finite element fe methods, explains successful concrete modelling and interpretation of results. An attempt is made to model the slab, flexural reinforcement and shear reinforcement using three. Guide to the design and construction of reinforced concrete flat slabs 1. It has already been shown that lusas is capable of designing this slab using a finite element analysis. Finite element analysis the finite element method predicts the behavior of larger more complex structures by separating the structure into smaller mathematically discrete parts called elements. Lusas finite element analysis the analysis was done for the typical flat slab arrangement shown above.
Many reputable commercial fem analysis software packages are available on the market today such as spmats. Introduction a slab is a flat two dimensional planar structural element having thickness is small as compared to its other two dimensions. Katti, department of civil engineering,sapkal knlowedge hub college of engineering,nashik. Finite element analysis of effect of punching shear in. Reinforcing a flat slab using oneway spanning rollout mats this guide outlines the benefits of using flat slab. Introduction to finite element analysis fea or finite. Use of finite element fe analysis has particular advantages when the floor has irregular supports or geometry, large openings or carries concentrated heavy loads. Finite element analysis of concrete filled tube column to. Within this framework, several aspects should be investigated such as the loaddeformation response of the slab, the failure mechanism, and the.
The slabs effect on the overall economy of the structural system. In this paper, an attempt has been made to utilize a tension softening material tsm model to simulate the full precracking and postcracking response of fibre reinforced concrete flat slabs at slabcolumn connections by finite element analysis. Easy to use software becoming more widely available very accurate if used properly better than grillage. Twoway joist concrete slab floor waffle slab system. As part of the computeraided structural engineerlng case committee study, it focuses on techniques for concrete flat slabs. It was created in lusas civil and structural academic version. With a purpose of developing criteria for finite element analysis of flat slab floors, this report has two objectives. The relative cost of computer hardware and software has reduced significantly over recent years and many engineers now have access to powerful software such as finite element fe analysis packages. Behaviour of flat slab a study by finite element analysis.
Flat slab types of flat slab design and its advantages. Many parameters related to fire resistance of the flat slabs have been studied and the finite element analysis results reveal that the width and thickness of the slab, the temperature gradient, the fire direction, the exposure duration and the thermal restraint are important factors that influence the vertical deflection, bending moment and. The corresponding design equation was then proposed based on finite element analysis of 82 parametric models. Recommendations for finite element analysis for the design of. Interval finite element analysis is being shown as an efficient tool to analyze large and complicated structures which otherwise are impossible to be analyzed for all possible load patterns and load combinations. The static analysis is performed in two load steps. Effects of openings on the punching shear strength of. Finite element method fem is another method for analyzing reinforced concrete slabs, particularly useful for irregular slab systems with variable thicknesses, openings, and other features not permissible in ddm or efm. The field is the domain of interest and most often represents a. Apr 04, 2019 in this file, a concrete slab that has been tested in the laboratory has been modeled in abaqus.
Introduction to fem finite element method fem is a technique in which not. Due to the constraints of the academic version the size of the problem had to be limited. Flat slab structures show significant vulnerability under lateral and vertical seismic loading as punching shear failure may occur in the joints of slab and column. Reinforced concrete slabs are structural systems most commonly used for roofing multistory buildings and hotels. It is to be modelled as shell finite elements in autodesk structural bridge design and the data file saved for analysis in chapter 7. Also, the finite element analysis of the slab panels has been carried out by using ansys workbench 14. A three dimensional finite element model fem is developed through ansys 10 computer software, to carry out the nonlinear analysis of 16 flatslab models with. Care is needed in modelling the geometry, material properties and loads on the structure. Guide to the design and construction of reinforced concrete flat slabs contents membersof the projectsteeringgroup list of tables vii iv list of figures v 1. Finite element analysis of slab and a comparative study with. The development of a linear numerical model of flat plate to predict shear stress distribution around slab column connection is presented in this paper. Punching of flat slabs design for shear at th e column heads 12. Therefore, the principal aim was the nonlinear finite element analysis of flat slabs with large amounts of punching shear reinforcement. At first i modelled one single floor and my moment map didnt look right hogging moment where theyre supposed to be sagging.
The finite element method predicts the behavior of larger more complex structures by separating the structure into smaller mathematically discrete parts called elements. This method allows the design of irregular column layoutsand can provide the. Finite element method based upon the division of complicated structures into smaller and simpler pieces elements whose behaviour can be formulated. Hi, im pretty new to finite element design and i was trying to design a flat slab. The elements can be triangular, rectangular or quadrilateral. A concrete slab is shown below which has the same setting out dimensions as the slab in example 6. Pdf understanding the behavior of flat slab by linear and.
How to design reinforced concrete flat slabs using finite. Later on, hong guan 2009 applied the nonlinear layered finite element method lfem. Finite element analysis of slab and a comparative study with others analytical solution 266 7th icct 2004 m 24 pp265272 1 introduction slabs are most widely used structural elements of modern structural complexes and the reinforced concrete slab is the most useful discovery for supporting lateral loads in buildings. This is a study aimed at providing guidance for the use of finite element analysis programs. Finiteelement analysis and load rating of flat slab. How to design reinforced concrete flat slabs using finite element analysis. The hot rolling process to form i or h section beam is simulated statically using rezoning. The finite element method fem, or finite element analysis fea, is a computational technique used to obtain approximate solutions of boundary value problems in engineering. Request pdf finiteelement analysis and load rating of flat slab concrete bridges a significant portion of the nations aging bridge inventory consists of flat slab concrete bridges.
The validated finite element procedure is then used to estimate the minimum velocity of the impactor required to perforate, in the sense of the socalled ballistic limit, a 150 mm thick twolayer reinforced concrete slab for impactor weights 250 kg, 500 kg and kg. Flat slab, slabcolumn connection, finite element, eccentric load. Analytical study of solid flat slab and voided slab using. Finite element analysis and optimization of bonded posttensioned concrete slabs abbas h. Aug 27, 2015 guide to the design and construction of reinforced concrete flat slabs contents membersof the projectsteeringgroup list of tables vii iv list of figures v 1. Analysis of flat sanalysis of flat sllabab moment division example 6000 6000 6000 6000 6000 5000 layout of building 7000 5000 a floor slab in a building where stability is provided by shear walls. However, there are some pitfalls to avoid, that often catch out the unwary. Understanding the behavior of flat slab by linear a nd nonlinear finite element analysis 7.
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