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首页> 外文期刊>Bulletin of earthquake engineering >A posteriori optimal intensity measures for probabilistic seismic demand modeling
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A posteriori optimal intensity measures for probabilistic seismic demand modeling

机译：概率地震需求建模的后验最优强度措施

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摘要

A probabilistic seismic demand modeling approach with the optimal intensity measure (IM) parameters determined a posteriori (POS-PSDM) is employed to examine and compare the full potential of the explanatory power of different IM formulations. A total of six IM formulations adopting the optimal IM parameters determined a posteriori (i.e. POS-IMs) are studied, including two spectral IMs with the optimal period T*, two fractional order IMs with the optimal fractional order alpha*, as well as two spectral IMs with the optimal period T* and the optimal damping ratio zeta*. A comprehensive IM comparative study is conducted based on hysteretic single-degree-of-freedom systems, considering a wide range of structural parameters. The POS-IMs manifest substantially improved performance (i.e. efficiency and sufficiency) compared with their conventional counterparts, revealing the value of adopting this POS-PSDM approach to ensure the PSDM predictive performance. In particular, the spectral acceleration at the optimal period and damping ratio, S (a) (T*,zeta*), which is introduced as an IM candidate for the first time, not only consistently demonstrates superior explanatory power but also exhibits fairly good hazard computability. The POS-PSDM approach in conjunction with S (a) (T*,zeta*) exhibits good potential in further improving the accuracy and reliability of probabilistic seismic risk assessment with negligible increase in computation cost.
机译：具有最佳强度测量（IM）参数的概率地震需求建模方法确定了后验（POS-PSDM）来检查和比较不同IM配方的解释性的全部电位。采用最佳IM参数的总共六个IM制剂确定了后验（即POS-IMS），包括具有最佳时段T *的两个光谱IMS，具有最佳分数阶Alpha *的两种分数IMS，以及两个具有最佳时段T *的光谱IMS和最佳阻尼比Zeta *。考虑到各种结构参数，基于滞后单度自由度系统进行了全面的IM比较研究。与传统对应物相比，POS-IMS表现出显着提高的性能（即效率和充足性），揭示了采用这种POS-PSDM方法以确保PSDM预测性能的价值。特别地，最佳时段和阻尼比的光谱加速度，S（a）（t *，zeta *）首次被引入IM候选，不仅始终如一地展示了优异的解释性，而且表现出相当不错的危险可计算性。与S（a）（t *，zeta *）结合的POS-PSDM方法表现出良好的潜力，进一步提高概率地震风险评估的准确性和可靠性，其计算成本可忽略不计。

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