基于易损性分析的RC框架-填充墙结构地震直接经济损失计算

Seismic direct economic loss analysis of infilled RC frame structure based on fragility analysis

面对地震灾害造成的巨大经济损失,对地震直接经济损失作出合理的评价将为地震保险费率的厘定和各利益相关者的决策提供依据。借鉴PEER提出的单体建筑基于性能的损失评估理论,按照该理论的各分析模块,对某小学框架-填充墙结构综合楼建立三维空间模型,选择24条地震动记录,进行增量动力分析,进而得到不同损伤状态的易损性曲线,在此基础上进行了地震直接经济损失分析,并对是否考虑填充墙平面内外相互作用的2种建模方式下的易损性与经济损失进行了比较。分析结果表明:这一基于全概率理论模块化的分析方法能够对单体建筑在设定地震动强度下的直接经济损失进行有效的评估。不考虑填充墙平面内外相互作用的建模方式低估了结构的抗震性能,从而高估地震直接经济损失。

In the face of the huge economic losses caused by the earthquake disaster, the reasonable evaluation of the direct economic loss of earthquake will provide the basis for determining the earthquake insurance premium rate and decision - making for the stakeholders. Based on PEER performance assessment methodology of economic los- ses for individual building, the three - dimensional model of a 6 - storey infilled frame comprehensive building of a primary school was built and analyzed according to the analysis modules of this methodology. 24 ground motion re- cords were selected to carry out incremental dynamic analysis and fragility curves of different damage states were de- rived. Then the direct economic loss of earthquake were analyzed. And fragility and economic losses of the model with and without consideration of in - plane and out - of - plane interaction of infill walls were compared. Analytical results show that the modularized analysis approach based on the full probability theory can effectively evaluate the direct economic losses of the individual building under the given ground motion intensity. Without considering in - plane and out - of - plane interaction of infill walls, the performance of the structure is underestimated, and then the direct economic loss is overestimated.