Effects of various uncertainties on seismic risk of steel frame equipped with steel panel wall

Probabilistic risk analysis is an effective tool for risk-informed decision-making related to the building facilities. All sources of the uncertainties should be considered in seismic risk assessment framework. Not only the levels of these uncertainties but also the effects on the performance of the buildings should be clearly identified. This paper aims to assess the impacts of the potential uncertainties on the seismic risk of steel frame equipped with steel panel wall (SPWF). Firstly, the performance limits of the SPWF structures are determined according to cyclic test results of two SPWF specimens. Then a validated numerical model of a 12-story SPWF building is modeled and used to perform the nonlinear time-history analysis, and the record-to-record uncertainty is identified by a set of ground motions derived from SAC project. Furthermore, comparisons are made on fragility curves for the building with or without considering the combining uncertainties in structural system, in defining performance limits and modeling technology. Finally, the annual probability and probability in 50 years for each performance limit is calculated and compared. The impacts of such uncertainties on seismic risk of SPWF building are quantified for risk-informed evaluation of the SPWF buildings.