高层 RC 框架-剪力墙结构地震风险与抗震韧性评估

The earthquake loss of the high-rise RC frame-shear wall structure is huge and the damage occurs from time to time. In order to reveal differences in the ability of structures to withstand earthquake risks, taking high-rise reinforced concrete (RC) frame-shear wall structures as the research object, typical high-rise RC frame-shear wall structures were designed according to the current codes using PKPM. Taking OpenSees as the finite element analysis platform, an improved multiple vertical line element model (SFI-MVLEM), which can consider the shear-flexure interaction, is adopted to establish the macro equivalent model of RC frame-shear wall structures. The seismic fragility was analyzed using a parallel multiple stripe analysis (PMSA) approach. Component fragility parameters were compared to judge the failure order of components. Then, the intensity-based and time-based assessment of earthquake losses of the buildings, including direct losses, repair time, and fatalities, were evaluated using the FEMA P-58 methodology and the performance assessment calculation tool (PACT) . The results show that although the direct economic loss caused by the failure of the ceiling and its ancillary components is not large, the repair time is too long to ignore. By using GB / T 38591-2020 ‘Standard of seismic resilience assessment of buildings’, the seismic resilience of RC frame-shear wall structures with five seismic fortification levels was evaluated and rated. It is shown that the buildings obeying the ‘uniform hazard’ as the fortification principle have great differences in the seismic capacity, and the concept of ‘uniform risk’ should be implemented in structural seismic design.