Seismic performance of R.C buildings with Beam-Column joints upgraded using FRP laminates

摘要

In the present study, the consequences and effects of CFRP-strengthening on the dynamic response of a seismically deficient building were investigated under the ground motion acceleration of selected earthquake using pushover and nonlinear time history analyses. A reinforced concrete frame building located in the Gulf of Aqaba region in Saudi Arabia, classified as a seismically active region, was selected for the study. The study building, initially designed for gravity loads only, was subjected to earthquake forces. The analysis showed that most of beam-column joints are deficient for earthquake loading and thus require strengthening. CFRP-sheets were used for seismic rehabilitation to enhance the properties of the seismically deficient building members. The number of required layers of CFRP sheets was estimated following the guidelines of ACI 440. The seismic suitability of strengthened members was then evaluated with the help of pushover and dynamic time-history analyses to verify the adequacy of CFRPStrengthening. Numerical analysis carried out with the help of SAP 2000 program. The results of the study showed that the CFRP-strengthening of beam-column joints delayed the formation of the plastic hinges, efficiently controlled the inelastic deformation at the critical plastic hinge locations, and significantly improved the seismic performance of the building without adversely affecting the overall dynamic response.