REPAIR AND RETROFITTING OF HIGHWAY BRIDGES USING FRP TECHNIQUE

Abstract

Many existing reinforced concrete structures were designed before the introduction of modern seismic code and are thus vulnerable to collapse in the event of an earthquake. It is often more economically feasible to retrofit these structural components than to completely replace them. In order to strengthen these susceptible reinforced concrete structures against seismic loading, it is important to understand the progression of damage and mechanisms causing collapse in such structures under both gravity and seismic loads. The comparative study of three square column section with increasing cross sectional size and confinement effectiveness from spacing of stirrups up to 4hhl layer of GFRP wrapping is carried out in the dissertation work. The analysis consist of axial load Vs axial deformation relationship, moment-curvature, ductility and shear capacity of column. The analysis results shows that as the size of column section increases then confinement effectiveness of GFRP jacketing decreases because of the hoop stress is inversely proportional to the diameter of column and confinement effectiveness due to decreasing spacing of transverse reinforcement is very small as compare to increasing layer of GFRP wrapping