Seismic collapse assessment of self‐centering hybrid precast walls and conventional reinforced concrete walls

Abstract

The past studies have demonstrated the superior performance of self‐centering hybrid precast (SCHP) walls in terms of reducing structural damage and residual drifts compared with conventional reinforced concrete (RC) walls following an earthquake. This study evaluates the collapse performance of SCHP walls through numerical analyses, and compares the results with that of RC walls. For this purpose, analytical models of code compliant four‐story and six‐story prototype SCHP and RC wall structures designed with varying structural and seismic parameters were developed. Based on the results of incremental dynamic analysis, the adjusted collapse margin ratio (ACMR) of each prototype structure was determined and compared to the established limits specified in the FEMA P695 procedure. The results reveal that the collapse capacities for the SCHP walls are comparable to that of RC walls. The slightly larger collapse margin ratio for the six‐story RC wall over the six‐story SCHP wall might be attributed to the less sufficient energy‐dissipating capacity of the SCHP wall as demonstrated by the cyclic pushover analyses. It is found that the computed ACMRs (ranging from 3.13 to 3.79) are more than twice the accepted ACMR limit (1.56), indicating that all the structures have enough seismic collapse safety against maximum considered earthquakes.