Internati onal Journal of Engineerin g Trends and Technol ogy (IJETT) – volume 5 number 3- Nov 2013 ISSN: 2231-5381 http://www.ijettjournal.org Page 140 Non-Linear Finite Element Analysis of RC S labs Strengthened with C FRP Laminates Mustafa Basheer Mahmood 1,2 , V. C. Agarwal 3 1 Master Te chnology, Departme nt of Civi l Engg., SSET , Sam H igginbottom Ins titute of Agr iculture, Tec hnology & Science-DU, Allahabad, India. 3 professor and head of D epartmentof Civil Engg., SSET, Sam Higginbottom Institute of Agriculture, Technology &Science- DU, Allahabad , India. 2 kirkuk University, kirkuk, Iraq. Abstract — The present study deals with the finite element modelling of control RC slabs and strengthened slabs with the help of ANSYS. ANSYS is software that is based on FE method in which modelling of RC structures is done. In this study, a control slab was modelled and the results were analysed and then strengthened slabs were modelled and analysed. The results of the control and strengthened slabs were compared with the experimental results. It was observed that the results of the strengthened slabs are in close agreement with the experimental results. Keywords—RC Reinforced Concrete, Strengthened Slabs, CFRP Carbon Fibre Reinforced Polymer, Numerical (ANSYS). I. INTRODUCTION Slabs are plane structural members whose thickness is very s mall in comparison with its long and short spans . In reinforced concrete struct ures , slabs are most repeatedl y used to forming roof covering , floors and bridges. Slabs may be supported by walls or beams or directly by columns . It usually carries uniformly distri buted gravity load actin g normal to its span and transfers same to t he supports by flexure, shear and torsion. Therefore because of its complex behaviour it is difficult to decide whether the slab is a struct ural component , structural element , or structural system in itself. Repair and rehabilitation has become an important aspect for the reinforced cement concrete structures because of the damage in the RC struc tures occ urs due to v arious reasons like cracking of concrete, concrete or spalling due to large deflections , change in design configuration , co rrosi on of steel, increasing load on the structure , inferior building material and environmental effects. The following are the main objectives of the present study: a) To model the reinforced concrete slabs called as control slabs and the strengthened slabs with different reinforcement using FEM. b) To determine analy tically the load deflection curve of control slab and strengthened slabs. c) To compare the results of control slabs and the strengthened slabs and also compare the analytical results with the experimen tal results. II. LITERATURE REVIEW Elsayed , et al., (2007) presented the finite element analysis that was carried to simulate the non-linear load-deflection behaviour and failure mech anisms for reinforced concrete two-way slabs strengthened with externally bonded fibre reinforced polymers. It was found that increasing the width of FRP laminates led to decrease in the interfacial shear stress and slips. Kim , et al., (2008) studied the effectiveness of two-way slabs strengthened with prestressed or non-prestressed carbon fibre reinforced polymer (CFRP) sheets. . It was found that failure of the control slab was very ductile and the strengthened slabs failed because of the delimitation or partial rupture of the CFRP sheets. Kenneth , et al., (2011) presented the non-linear finite element method of reinforced concrete members externally strengthened with FRP which includes the flexure and shear strengthen ing of beams and FRP stren gthening of two-way slabs. III. MATERIALS AND METHODOLOGY The finite element method is a numerical analysis technique for obtaining approximate solutions to a wide variety of engineering problems. ANSYS is a general purpose finite element modelling package for numerically solving a wide variety of problems which include static/dynamic structural analysis (both linear and nonlinear), heat transfer and fluid problems, as well as acoustic and electro -magnetic problems. The Rectangular RC slabs with tensile reinforcement have been analysed using a finite element (FE) model in ANSYS. Here, a non linear analysis is considered throughout the study by assuming that there is a p erfect bonding betwee n concrete and steel reinf orcement , and reinforce d concrete with CFRP laminates. The results from the numerical simulation are used for comparison with the results from the experiment to achieve the principle objective of studying the flexural capacity behaviour of reinforced slabs strengthened with CFRP laminates subjected to distributed line loading. The experiment al work done by Abarna Sivarajah , Anushka Abeysinghe, Malith Lakshitha, Dr. Sujeewa L. including five commercial material models was performed using this numerical simulation study. ANSYS (version 13) has been