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在传统地震易损性分析的基础上,提出了易损性指数的概念,并用其来评估结构的地震损伤。通过引入群体结构震害评估中震害指数的概念,结合解析地震易损性分析得到的结构破坏状态概率,将震害指数的数学期望作为单体结构的易损性指数。选择8层和10层两组考虑不同抗震设防水平的钢筋混凝土框架结构为研究对象,分析得到结构的地震易损性曲线、破坏状态概率曲线、易损性指数曲线以及结构在小震、中震和大震作用下的易损性指数。分析结果表明:按我国抗震规范设计的钢筋混凝土框架结构基本可以满足“小震不坏”、“中震可修”和“大震不倒”的性能要求。在大震作用下,结构可以较好地控制较严重破坏的发生。随着抗震设防水平的提升,结构的抗震能力得到了加强,但结构在小震、中震和大震作用下的易损性指数却发生了增加。
Based on the analysis of traditional seismic vulnerability, the concept of vulnerability index is proposed and used to evaluate the seismic damage of the structure. By introducing the concept of earthquake damage index in the group earthquake damage assessment and combining with the probability of structural failure state analyzed by the earthquake vulnerability analysis, the mathematical expectation of the earthquake damage index is taken as the vulnerability index of the single structure. Two layers of 8-story and 10-story reinforced concrete frame structures with different seismic fortification levels are selected as the research object. The seismic vulnerability curves, the failure probability curves, the vulnerability index curves and the structures of the structures are analyzed. And under the action of the earthquake vulnerability index. The analysis results show that the structure of reinforced concrete frame designed according to China’s seismic code can basically meet the performance requirements of “small earthquake is not bad”, “moderate earthquake can be repaired” and “large earthquake does not fall”. Under the action of a large earthquake, the structure can better control the occurrence of more serious damage. As the level of seismic fortification increases, the seismic capacity of the structure is strengthened, but the vulnerability index of the structure increases under the influence of small earthquakes, moderate earthquakes and large earthquakes.