基于多维性能极限状态的概率地震需求分析

发布时间：2018-08-13 15:37

【摘要】：基于概率地震需求分析(PSDA),分别采用增量动力和非线性时程分析,得到某框架结构的最大层间漂移比和最大加速度响应,通过定义多维性能极限状态的性能水准,计算该结构的多维地震易损性,联合地震动危险性曲线,建立了年平均超越概率的三重积分公式,采用梯形法求得50年内地震需求(漂移)危险性曲线。在此基础上,进行了同时考虑性能极限状态的随机性和相关性对结构需求危险性的敏感性分析。在性能极限状态不确定性中选择适当的变异系数(cidrcpfa)及相互作用因子NID R,能够使年平均超越概率增加;相比单一极限状态,考虑二维极限状态的年平均超越概率也将提高。研究结果表明,所提方法可描述对多维响应参数敏感的结构破坏行为,可获得设计基准期内更加符合实际的结构需求危险性曲线,为震后损失估计提供可靠的理论依据。
[Abstract]:Based on probabilistic seismic demand analysis (PSDA), incremental dynamic analysis and nonlinear time-history analysis are used to obtain the maximum interlayer drift ratio and maximum acceleration response of a frame structure, and the performance level of multi-dimensional performance limit state is defined. The multi-dimensional seismic vulnerability of the structure is calculated, combined with the seismic hazard curve, the triple integral formula of the annual average overtaking probability is established, and the seismic demand (drift) risk curve within 50 years is obtained by trapezoidal method. On this basis, the sensitivity analysis of the randomness and correlation of the performance limit state to the structural demand risk is carried out. Choosing the appropriate coefficient of variation (cidrcpfa) and the interaction factor (NID R) in the uncertainty of the performance limit state can increase the annual average transcendence probability and increase the annual average transcendence probability considering the two-dimensional limit state compared with the single limit state. The results show that the proposed method can describe the structural failure behavior which is sensitive to the multi-dimensional response parameters, and can obtain the structural demand risk curve which is more in line with the actual structure in the design reference period, and provides a reliable theoretical basis for the post-earthquake loss estimation.
【作者单位】：西北工业大学力学与土木建筑学院;
【基金】：国家自然科学基金(51278420) 西北工业大学博士论文创新基金(CX201408)
【分类号】：TU311.3

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