How to design reinforced concrete flat slabs using finite. Finiteelement analysis and load rating of flat slab concrete. Also highlights the benefits, and some of the common pitfalls of fe analysis, and gives guidance on best practice. Finite element analysis shows whether a product will break, wear out or. This publication seeks to introduce fe methods, explain how concrete can be successfully modelled and how to interpret the results. Four interior reinforced concrete slab column connections one slab is without shear reinforcement, while the other slabs are with shear bolts previously tested under static loading are analysed. However, there are some pitfalls to avoid, that often. Detailed plans, sections, elevations, schedules, and. Best slab fe package best slab fe package mhspurs structural op 9 feb 07 08. This article discusses the similarities and differences between traditional frame methods and finite element methods for the design of floor slab systems. Punching shear reinforcement systems such as studs and stirrups are used to improve the punching shear strength of flat slabs. Analyze and design flat slab or waffle slab floors. Detailed plans, sections, elevations, schedules, and tables may be generated, viewed, and printed from within safe or exported to cad packages.
Finite element analysis of effect of punching shear in flat slab using ansys 16. Katti, department of civil engineering,sapkal knlowedge hub college of engineering,nashik. Nonlinear finite element analyses were performed on interior slabcolumn connections to investigate the effects on the punching strength of flat slabs. Finite element implementation of punching shear behaviors. However, if designing to eurocode 2 the requirements of cl. As point supports of the flat slab, columns are used. 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.
Design of flat slabs including finite element analysis. Analytical study of solid flat slab and voided slab using. Finite element design without strips is also available and useful for slabs with complex geometries. 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. Comparative study of reinforced concrete flat slabs with. Design of flat slab structures advance design graitec.
Mar 25, 2016 analysis on flat plate and beam supported slab 1. May 26, 2011 they are generally designed using finite element analysis. Flat slabs may have drop panels at columns and columns may have capitals. Jul 24, 2017 autodesk robot structural analysis pro in this lesson, curved beams are explained as well as the analysis of a structure. Easy to use software becoming more widely available very accurate if used properly better than grillage. Threedimensional 3d finite element analysis fea is considered to examine previously tested and analyzed under static loading reinforced concrete slabs using the fea software abaqus. Modelling a flatslab structure using fem software is simple at first glance. Built on adapts unique truestructure modeling and analysis technology, this software provides a powerful, yet easy to use tool for the analysis of all types of slab systems. 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. This is the procedure where the structural designer will interpret hisher design and reflect it in a structural plan. Hi, im pretty new to finite element design and i was trying to design a flat slab. May 06, 2016 from the concrete centre publication how to design reinforced concrete flat slabs using finite element analysis by o brooker in pg. The problem that can occur in flat slabs is high stresses in the slabcolumn.
Structural engineering software for finite element analysis fea of planar and spatial structural systems consisting of plates. Drop panels play a significant role here as they augment the. Design of flat, ribbed, waffle slab systems using analytical and finite elements methods and automatic punching checks. Finite element implementation of punching shear behaviors in. A nonlinear three dimensional finite element analysis has been used to conduct an analytical investigation on the overall behavior of reinforced concrete flat slabs. A total of twentyseven threedimensional finite element models were constructed to represent largescale flat plate slabs 2000. Only a limited number of studies examined the dynamic punching failure of a flat slab column connection, mostly by numerical analysis, using finite element analysis techniques 161718 19. Nonlinear finite element analysis of reinforced concrete. Mar 26, 2018 design strips, safe finite element analysis, slab analysis, slab design interpreting the slab analysis result using safe program is the last stage to consider in the design of the slab using safe. Structural modeling and analysis of concrete floor slabs. A nonlinear three dimensional finite element analysis has been used to conduct an analytical investigation on the overall behavior of reinforced concrete flat. However, one of the particularities that comes first when designing the slab is the concentration of internal forces in the slab directly above the column and taking. 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.
The stresses from the finite element software are compared to the stresses obtained from recalculated stresses obtained using flat plate theory. Only a limited number of studies examined the dynamic punching failure of a flat slabcolumn connection, mostly by numerical analysis, using finite element analysis techniques 161718 19. Finite element analysis of a slab tank pressure vessels. Masterseries finite element analysis software structural. Fracture analysis of punching shear in flat slab with conventional punching shear reinforcement and steel fiber using fea software written by mahesh bariya, krishna nair published on 20190918 download full article with reference data and citations. Finite element analysis fea is a computerised method for predicting how a product reacts to realworld forces, vibration, heat, fluid flow and other physical effects. Autodesk robot structural analysis pro in this lesson, curved beams are explained as well as the analysis of a structure.
Finite element analysis module is an addon module for masterframe to significantly enhance the analysis capabilities of masterframe the finite element analysis method allows you to model surfaces such as slabs and walls using finite elements, thus allowing the analysis of surfaces structural elements even with highly complex geometries and multiple openings. Finite element analysis shows whether a product will break, wear out, or work the way it was designed. In accordance to such research, the lfem is an effective tool in global analysis and. The use of 8noded quadrilateral finite elements ensures a high level of numerical accuracy in the analysis. We are currently updating our office software irish based and would like to include a. Threedimensional 3d finite element analysis fea is considered to. The development of finiteelement fe analysis software designed specifically for the load rating of flat slab bridges is presented. However, there are some pitfalls to avoid, that often catch out the unwary. This problem is exacerbated by the introduction of posttensioning, especially when beamless floor systems flat slabs are used.
Later on, hong guan 2009 applied the nonlinear layered finite element method lfem. Ngo and scordelis 1967 presented the first finite element analysis of reinforced concrete that included the effect of cracking. Introduction a slab is a flat two dimensional planar structural element having thickness is small as compared to its other two dimensions. The procedure is validated for a largescale reinforced concrete flat slab without shear reinforcement that failed in punching. Flat slab construction is stateoftheart structural software for the analysis and design of single and multistorey flat slabs in accordance with section 3. Finite element analysis is the ideal software tool to model and analysis walls, slabs, transfer slabs, shear cores, rafts, basements etc.
Figure 1 rectangular slab figure 2 trapezoidal slab. Four interior reinforced concrete slabcolumn connections are presented. Katti2 1pg student, department of civil engineering,sapkal knlowedge hub college of engineering,nashik. Finite element analysis of rc flat slabs with different amount and. The course will explain what input data to use for the software and how to use the output, but does not cover the use of specific software. The dimensioned slab tank is modeled using staad iii finite element software. Fem is a powerful tool used in the analysis of flat slabs. Adaptbuilder adaptfloor pro is threedimensional 3d finite element software for analysis and design of concrete and posttensioned floor and foundation systems. This papers main objective is to compare the flat plate theory to the. Finite element analysis of a slab tank pressure vessels and. Analyses of this type of slab are complex and are often designed using software developed for linear analysis based on the classic plate theory, using numerical analyses skorpen et al. Numerical analysis of symmetrical and asymmetrical. 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.
Most finite element programs are based on elastic moment distribution and material that obey hookes law. Flat slab types of flat slab design and its advantages. We are currently updating our office software irish based and would like to include a concrete flat slab fe package as part of a new suite. The strip may have up to 20 spans and may have cantilevers at the ends. Finite element analysis of a reinforced concrete slabcolumn. The analysis and design of reinforced concrete shear wall footing strip footing is shown in this example. Fracture analysis of punching shear in flat slab with. Threedimensional 3d finite element analysis fea in abaqus software examines the punching shear behaviour of reinforced concrete slabs. At first i modelled one single floor and my moment map didnt look right hogging moment where theyre supposed to be sagging. Finite element analysis of rc flat slabs with different. Modeling and bending design of pointsupported flat slab dlubal. Finite element method based upon the division of complicated structures into smaller and simpler pieces elements whose behaviour can be formulated. The youngs modulus and poissons ratio is taken as 3e5pa and 0.
Reinforced concrete slab and beam design software reinforced concrete slab and beam design software adaptrc 2017 product overview an easytouse and learn software for the design, analysis, and investigation of reinforced nonprestressed concrete beams, beam frames, slabs and floor systems a must have production tool in every structural engineering office. Design strips, safe finite element analysis, slab analysis, slab design interpreting the slab analysis result using safe program is the last stage to consider in the design of the slab using safe. Structural engineering software for finite element analysis fea of planar and spatial structural. The hand solution is used for a detailed comparison with the analysis and design results of the engineering software program spmats using the finite element analysis fea method. The finite element method fem and grid analogy method are examples for numerical analyses, both procedures widely used by technical designers. Different analysis and design approaches for flexural reinforcement of rc flat slabs will be performed based on the same model slab. Safe provides an immensely capable yet easytouse program for structural designers, provideing the only tool necessary for the modeling, analysis, design, and detailing of concrete slab systems and foundations. Introduces finite element fe methods, explains successful concrete modelling and interpretation of results. An analytical procedure is presented for simulating punching failure. A flat slab is usually a pointsupported joistfree plate. Similar features and more are now available in sumo structural modeller and frame analysis with the finite element addon.
Finite element analysis of effect of punching shear in. Recommendations for finite element analysis for the design. The finite element method is commonly used to design the reinforcement in concrete slabs. 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. Comprehensive and customizable reports are available for all analysis and design results. Analyses are for a onebaywide strip using the equivalent frame analysis method of the aci code. This article describes how a flat slab is generated as 2d model in rfem and the loading is applied according to. Comparative study of reinforced concrete flat slabs with and. Integrated meshing and analysis of slab and foundation systems with the building model.
Finite element analysis module is an addon module for masterframe to significantly enhance the analysis capabilities of masterframe the finite element analysis method allows you to model surfaces such as slabs and walls using finite elements, thus allowing the analysis of surfaces structural elements even with highly complex. Modelling with the finite element method fem of the reinforced concrete flat slab structure with the use of axisvm software. Aug 12, 2008 the dimensioned slab tank is modeled using staad iii finite element software. Flat slab is a reinforced concrete slab supported directly by concrete columns without the use of beams. This course will explain the provisions within eurocode 2 for flat slabs and how to use finite element analysis to accurately design flat slabs. Then i created one slab for each panel and i got a moment map that satisfied me. Finite element analysis of effect of punching shear in flat. Csi safe finite element design interpretation software. This works for steel plates but reinforced concrete is an elastoplastic material and ones it cracks its behavior is nonlinear. Finite element analysis fea is a computerized method for predicting how a product reacts to realworld forces, vibration, heat, fluid flow, and other physical effects. Design of flat slabs using shell finite element analysis. A concrete slab is shown below which has the same setting out dimensions as the slab in example 6. Availability of this program was discontinued in 2008. Multitudes of process and methods are involved in designing flat slabs and evaluating these slabs in flexures.
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 and without punching shear reinforcement. Finite element simulation of flat slabs with various placement and. For instance, finite element computer software packages will be used to perform the finite element analysis. The elements can be triangular, rectangular or quadrilateral. From the concrete centre publication how to design reinforced concrete flat slabs using finite element analysis by o brooker in pg. Recommendations for finite element analysis for the design of. Finite element fe analysis, is a popular powerful computer method of analysing flat slab concrete structures. Punching shear analysis of reinforced concrete flat plates. Also, the finite element analysis of the slab panels has been carried out by using ansys workbench 14.
It is to be modelled as shell finite elements in autodesk structural bridge design and the data file saved for analysis in chapter 7. Pdf nonlinear finite element analysis of rc flat slabs. Finite element simulation of concrete slabs with various. Design economically and accurately by including column sections in fe mesh and considering openings, drops and loads on slabs in fe analysis. How to design reinforced concrete flat slabs using finite element. They are generally designed using finite element analysis. The properties were assigned to concrete and steel.
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