基于ETM的结构地震损伤评估

引用文献:

杜永峰 李文涛. 基于ETM的结构地震损伤评估[J]. 建筑结构,2023,48(03):116-121.

DU Yongfeng LI Wentao. Seimic damage assessment of structures by endurance time method[J]. Building Structure,2023,48(03):116-121.

作者:杜永峰 李文涛
单位:兰州理工大学防震减灾研究所 兰州理工大学甘肃省减震隔震国际合作基地
摘要:耐震时程法(ETM)是一种新的结构抗震性能评估方法,它所用的时程曲线具有地震强度随时间而增加的特点。基于《建筑抗震设计规范》(GB 50010—2010),采用最小二乘函数合成了3条耐震时程曲线。以装配式基础隔震结构为例,分别对结构进行10条天然地震波作用下的增量动力分析(IDA)和3条耐震时程作用下的非线性时程分析,对比研究了结构在不同地震强度下的最大顶点位移、最大层间位移角和最大隔震层位移。并将最大层间位移角作为指标代入结构抗震失效概率公式,通过易损性计算即可得到结构在不同耐震时间下的损伤指数期望值,可以此为依据来评估结构的损伤。分析表明,以最大层间位移角作为指标,ETM与IDA所得的结构损伤值吻合程度较高,但其计算量较IDA大大减小,因此对于结构的抗震损伤评估而言,ETM是一个高效的计算方法。
关键词:耐震时程法;增量动力分析法;抗震性能评估;易损性;损伤评估;
作者简介:杜永峰,博士,教授,博士生导师,主要从事结构减振、隔震控制相关研究,Email:dooyf@sohu.com。
基金:国家自然科学基金项目(51778276)。
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Seimic damage assessment of structures by endurance time method
DU Yongfeng LI Wentao
(Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology International Research Base on Seismic Mitigation and Isolation of Gansu Province, Lanzhou University of Technology)
Abstract: The endurance time method(ETM) is a new method for evaluating seismic performance of structures. The time history curve used is characterized by an increase in seismic intensity over time. Based on Code for seismic design of buildings(GB 50010—2010), three endurance time-history were synthesized by using least squares function. Taking the precast concrete base isolation structure as an example, the incremental dynamic analysis(IDA) under the action of 10 natural seismic waves and the nonlinear time-history analysis under the action of three endurance time-history were carried out respectively, and the structure was compared under different seismic intensities about maximum vertex displacement, maximum inter-story drift and maximum isolation layer displacement. The maximum inter-story drift was used as indicators to substitute the seismic failure probability formula of the structure. The damage index expectation of the structure under different endurance time can be obtained by the vulnerability calculation. The damage of the structure can be evaluated based on this. The analysis shows that when the maximum inter-story drift is used as an index, the ETM has a higher degree of coincidence with the structural damage value obtained by IDA, but its calculation amount is greatly reduced compared with the IDA. Therefore, for the seismic damage assessment of the structure, the ETM is an efficient calculation method.
Keywords: endurance time method; incremental dynamic analysis method; seismic performance evaluation; vulnerability; damage assessment
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