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Role of conditioning intensity measure in the influence of ground motion duration on the structural response

机译：条件强度测量在地震动持续时间对结构响应的影响中的作用

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摘要

Although several research studies have examined some effects of ground motion (GM) duration on the structural responses, many questions in this field remain unexplored and unaddressed. One area that remains a topic of debate in this field is that no outcomes can be found with regard to the effect of GM duration on structural responses when considering different choices of conditioning intensity measures (IMs). This study examines the role of the conditioning IM in the degree that GM duration influences the structural responses. To this end, the seismic demand in three different structural systems from low- to high-rise buildings are estimated using multiple stripe analyses subjected to different sets of GMs from shallow crustal seismic zone. It is found that duration of GMs from shallow events affects the structural response but not as much as that reported for GMs from subductions events. The results also reveal that the importance of GM duration mainly depends on the considered conditioning IM. Specifically, GM duration does not substantially affect the structural responses in terms of probability of collapse if peak ground acceleration, peak ground velocity, spectrum intensity, spectral acceleration at higher modes are implemented as the conditioning IMs. On the other hand, in the case of cumulative absolute velocity and spectral acceleration at the fundamental and lengthened periods, the structural responses are considerably affected by GM duration.
机译：尽管一些研究已经研究了地震动（GM）持续时间对结构响应的一些影响，但该领域的许多问题仍待探索和解决。在该领域仍是一个争论的话题的领域是，当考虑不同的条件强度测量（IM）选择时，没有发现关于GM持续时间对结构响应的影响的结果。这项研究检查了条件性IM在GM持续时间影响结构响应的程度上的作用。为此，通过对来自浅地壳地震带的不同GMs进行多组分析，估算了从低层建筑到高层建筑在三种不同结构系统中的地震需求。发现浅层事件的GMs持续时间影响结构响应，但不像俯冲事件中的GMs那样大。结果还表明，GM持续时间的重要性主要取决于所考虑的条件IM。具体而言，如果将峰值地面加速度，峰值地面速度，频谱强度，较高模式下的频谱加速度实现为条件IM，则GM持续时间在坍塌概率方面基本上不会影响结构响应。另一方面，在基本周期和延长周期的累积绝对速度和频谱加速度的情况下，结构响应受GM持续时间的影响很大。

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