An earthquake-source-based metric for seismic fragility analysis
An earthquake-source-based metric for seismic fragility analysis
复制标题
基于震源的地震易损性分析指标
DOI:
10.1007/s10518-018-0341-9
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发表时间:
2018
影响因子:
4.6
通讯作者:
Grigoriu, Mircea
中科院分区:
文献类型:
--
作者:
Radu, Alin;Grigoriu, Mircea
The seismic fragility of a system is the probability that the system enters a damage state under seismic ground motions with specified characteristics. Plots of the seismic fragilities with respect to scalar ground motion intensity measures are called fragility curves. Recent studies show that fragility curves may not be satisfactory measures for structural seismic performance, since scalar intensity measures cannot comprehensively characterize site seismicity. The limitations of traditional seismic intensity measures, e.g., peak ground acceleration or pseudo-spectral acceleration, are shown and discussed in detail. A bivariate vector with coordinates moment magnitudemand source-to-site distanceris proposed as an alternative seismic intensity measure. Implicitly, fragility surfaces in the (m,r)-space could be used as graphical representations of seismic fragility. Unlike fragility curves, which are functions of scalar intensity measures, fragility surfaces are characterized by two earthquake-hazard parameters, (m,r). The calculation of fragility surfaces may be computationally expensive for complex systems. Thus, as solutions to this issue, a bi-variate log-normal parametric model and an efficient calculation method, based on stochastic-reduced-order models, for fragility surfaces are proposed.
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