考虑气温与发震时段影响的建筑群抗震韧性评价

Outdoor temperature and earthquake occurrence time significantly influence buildings’post-earthquake functionality and casualties. Therefore，a post-earthquake functionality assessment method for building portfolios was proposed that considering structural damage，insulation system damage，and the influence of outdoor temperature. In addition，a casualty calculation model was developed based on historical earthquake damage data and the real-time population heat map to evaluate casualties at different times of earthquake occurrence. Seismic damage simulations of a building portfolio were performed using the multi-degree-of-freedom model to analysis the influence of temperature and earthquake occurrence time on building functionality，casualties，and seismic resilience level. The results show that low temperatures lead to a significant increase in the post-earthquake functional loss of buildings. Compare to conditions at 15 ℃，functional loss increases by 42. 9% and 64. 9% at -15 ℃ and -5 ℃，respectively. In addition，the time-varying occupancy rate leads to a large difference in the casualty rate at different earthquake occurrence times，and the casualty rate is highest when earthquakes occur during the rest period of holidays，which is 1. 35 times the average value. The proposed method quantifies the effects of temperature and earthquake occurrence time on the building functional loss and casualty resilience indicators，expands the application scenarios of existing methods，and can provide a reference for the seismic resilience evaluation of building portfolios in cold regions.