The Effect of Site Seismic Hazard on Selection of a Retrofitting Method for a Deficient Reinforced Concrete Frame

One aspect of Performance Based Earthquake Engineering (PBEE) is to allow comparison between different designs and retrofit solutions using estimation of collapse probability. To investigate this process, case study was performed on the weak RC frame that has been retrofitted with two different methods, e.g., brace and cylindrical friction damper. Models of case study were defined in OpenSees software. Then 15 ground motions were selected and Incremental Dynamic Analysis (IDA) was conducted on models. The performances of buildings were evaluated by using a probabilistic analysis. The results show that, the retrofit methods reduces the possibility collapse in both performance levels, IO and CP. However, considering site-specific seismic hazard curve in which the reduction of structure period was included, the different results were obtained. In this study, although the collapse probabilities for a specific hazard level for both retrofitting schemes were reduced, the collapse probability of the structure retrofitted with brace in CP level increased in comparison with the initial structure.