effect of structural uncertainties on seismic performance of moment frame rehabilitated with steel shear wall

In performance-based engineering, conservatism in acceptance criteria at structural performance levels has increased the cost of retrofitting. when simulating structure response in the presence of uncertainties, seismic demand and structural capacity cannot be expressed certainly, though the possible range of these can be predicted. in the seismic rehabilitation of structures, uncertainties have been studied on existing structures and rehabilitation guidelines have been implemented on these uncertainties by reliability index. adding a secondary system to rehabilitate existing structure may increase uncertainties and may be effective for results of reliability. therefore, in this study, reliability of rehabilitated a structure with steel shear wall has been discussed with the aim of quantifying uncertainties. also, the parametric study of reliability index has been performed on probabilistic variables considered for steel shear wall. the selected structure is a threestorey structure of sac steel moment frame, which was rehabilitated by steel shear wall. for modeling and analyzing the structure, opensees software was used. the structure was subject to incremental dynamic analysis before and after of rehabilitation, with probabilistic variables considered for steel shear wall.