Reliability-based Seismic Assessment of Asymetric Multi-storey Buildings with Rc Shear Walls

The performance of buildings subjected to earthquake loads has shown that asymmetric structures are caused more extensive damages in comparison with symmetric structures. Hence, the seismic performance of asymmetric structures should be assessed due to future random earthquakes. Reliability-based seismic assessment as one of the tools in performance-based earthquake engineering has been introduced to quantify the seismic reliability for existing structures due to future random earthquakes. This paper deals with the reliability-based seismic assessment of asymmetric multi-storey buildings with RC shear walls with consideration of the angle of ground motion incidence. To implement this purpose, in the first stage, the multi-component incremental dynamic analysis (MIDA) is used for the assessment of asymmetric 6 and 9-storey buildings with RC walls. The MIDA as an efficient procedure can estimate the seismic capacity of a structural system with randomness on incident angle. In the second stage, the mean annual frequency exceeding of a specified level of structural demand is calculated to predict the reliability of these structures. The results show that the effects of earthquake incident angle should be considered in the assessment of the assessment of asymmetric multi-storey building.