Pollution Research Paper

Vol 33, Issue 02, 2014; Page No.(389-395)

EXPERIMENTAL INVESTIGATION ON CONVENTIONAL AND RETROFITTED WITH FRP WRAPPED RC BEAM SUBJECTED TO CYCLIC LOADING

A. MURUGESAN AND G.S.B. THIRUGNANAM

Abstract

When a RC moment-resisting frame is subjected to seismic load, the possible inelasticity is concentrated either in beams or in the beam-column joint regions. This is depends on not only the flexural capacity ratio of beams to column but also the details of both longitudinal and transverse reinforcement in the joints which affects significantly the shear strength and stiffness of the frame. Hence it is necessary to maintain the integrity of the beam column joints. Damage of the joints in the frame can result in instability of the structure and poor overall structural response. It has been shown that severe damage and collapse of many RC framed building in recent earthquakes are the results of poor reinforcement details of beam-column joints. This paper presents the seismic performance of the reinforced concrete beam designed for seismic loads as per IS 1893-2002 with and without retrofitting of FRP and ductility recommendations are adopted as per IS 13920-1993. Four specimens were cast with and without retrofitting and tested under cyclic loading, simulating earthquake actions.The beams are examined in terms of load carrying capacity, load deflection behavior, stiffness degradation factor, energy dissipation capacity, ductility factor and cracking characteristics. Based on the test results important conclusions are drawn and the advantages of retrofitting with FRP wrapped reinforced concrete beam have been established.

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