Seismic retrofit of non-ductile R/C frame structures
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Low-rise reinforced concrete frame buildings constructed in low to moderate seismic risk areas are generally designed for only gravity loads according to non-seismic detailing provisions of the code (ACI 318-89). The feasibility of using simplified analytical procedures to evaluate the seismic performance and damage in such structures before and after retrofit is suggested. A capacity spectrum based method for each story of the building forms the basis of the evaluation. A one-third scale model of such a building was constructed and experimentally tested under shaking table excitations. A seismic retrofit of the building was subsequently performed on selected columns by using a post-tensioned concrete jacketing technique so as to avert a catastrophic soft-story failure mechanism and enforce a more ductile strong column - weak beam behavior. This retrofitted model was then experimentally tested using the same shaking table excitations as in the original model tests. The experimental results of both the original and retrofitted models are used to verify the procedure suggested for evaluation.
