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Impact of hazard-consistent ground motion duration in structural collapse risk assessment

机译：危害一致的地震动持续时间对结构倒塌风险评估的影响

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This study evaluates the effect of considering ground motion duration when selecting hazard-consistent ground motions for structural collapse risk assessment. A procedure to compute source-specific probability distributions of the durations of ground motions anticipated at a site, based on the generalized conditional intensity measure framework, is developed. Targets are computed for three sites in Western USA, located in distinct tectonic settings: Seattle, Eugene, and San Francisco. The effect of considering duration when estimating the collapse risk of a ductile reinforced concrete moment frame building, designed for a site in Seattle, is quantified by conducting multiple stripe analyses using groups of ground motions selected using different procedures. The mean annual frequency of collapse (lambda(collapse)) in Seattle is found to be underestimated by 29% when using typical-duration ground motions from the PEER NGA-West2 database. The effect of duration is even more important in sites like Eugene (lambda(collapse) underestimated by 59%), where the seismic hazard is dominated by large magnitude interface earthquakes, and less important in sites like San Francisco (lambda(collapse) underestimated by 7%), where the seismic hazard is dominated by crustal earthquakes. Ground motion selection procedures that employ causal parameters like magnitude, distance, and Vs(30) as surrogates for ground motion duration are also evaluated. These procedures are found to produce poor fits to the duration and response spectrum targets because of the limited number of records that satisfy typical constraints imposed on the ranges of the causal parameters. As a consequence, ground motions selected based on causal parameters are found to overestimate lambda(collapse) by 53%. Copyright (C) 2016 John Wiley & Sons, Ltd.
机译：这项研究评估了在选择危害一致的地面运动进行结构倒塌风险评估时考虑地面运动持续时间的影响。基于通用的条件强度测量框架，开发了一种计算场地预期的地震动持续时间的源特定概率分布的程序。计算美国西部三个地点的目标，这些地点位于不同的构造环境中：西雅图，尤金和旧金山。通过为使用西雅图地震现场设计的延性钢筋混凝土弯矩框架建筑物评估倒塌风险时考虑工期的影响，可以通过使用不同程序选择的一组地震动进行多条分析来量化。当使用PEER NGA-West2数据库的典型持续时间地震动时，发现西雅图的年平均坍塌频率（lambda（collapse））被低估了29％。持续时间的影响在尤金（lambda（collapse）被低估了59％）等地点更为重要，那里的地震危险主要是发生大范围的界面地震，而在旧金山等地点（lambda（collapse）却被低估了7％），那里的地震危险主要是地壳地震。还评估了采用因果参数（例如幅度，距离和Vs（30））作为地面运动持续时间的替代物的地面运动选择程序。由于满足有限的因果参数范围的典型记录的记录数量有限，因此发现这些程序无法很好地满足持续时间和响应频谱目标的要求。结果，发现基于因果参数选择的地面运动高估了lambda（坍塌）53％。版权所有（C）2016 John Wiley＆Sons，Ltd.

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