基于易损性的RC框架填充墙结构概率地震安全评估

Fragility-based probabilistic seismic safety assessment of RC frame structures with infilled masonry walls

选择多条真实地震动作为输入,采用我国抗震设计规范中的经验限值作为极限状态定义值,分别针对3层、5层和10层的RC框架填充墙结构和RC裸框架结构进行地震易损性分析,并计算结构在小震、中震和大震条件下的极限状态失效概率和破坏状态失效概率。通过对比RC框架填充墙结构和RC裸框架结构的结果可以发现:填充墙可以有效降低RC框架结构在不同地震作用下的失效概率,从而提高框架结构的地震安全水平。

A suit of real ground motion records are selected as inputs. The empirical thresholds provided by the Chinese seismic design code are adopted as the definitions of the concerned limit states. Then the seismic fragility analysis is conducted for the three-story, fivestory and ten-story RC frames with and without infilled masonry walls. The limit state failure probabilities and the damage state failure probabilities conditioned on the frequent earthquake, the design-based earthquake and the major earthquake are calculated. As compared to the results from the RC bare frames we can find that the infilled masonry walls can effectively reduce the failure probability of the RC frame structures under various earthquakes and can consequently promote the safety levels against earthquake.