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Influence of earthquake ground-motion duration on damage estimation: application to steel moment resisting frames

机译：地震地震动持续时间对损伤估计的影响：在抗弯矩框架中的应用

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This paper presents an analytical study evaluating the influence of ground motion duration on structural damage of 3-story, 9-story, and 20-story SAC steel moment resisting frame buildings designed for downtown Seattle, WA, USA, using pre-Northridge codes. Two-dimensional nonlinear finite element models of the buildings are used to estimate the damage induced by the ground motions. A set of 44 ground motions is used to study the combined effect of spectral acceleration and ground motion significant duration on drift and damage measures. In addition, 10 spectrally equivalent short-duration shallow crustal ground motions and long-duration subduction zone records are selected to isolate duration effect and assess its effect on the response. For each ground motion pair, incremental dynamic analyses are performed at at least 20 intensity levels and response measures such as peak interstory drift ratio and energy dissipated are tracked. These response measures are combined into two damage metrics that account for the ductility and energy dissipation. Results indicate that the duration of the ground motion influences, above all, the combined damage measures, although some effect on drift-based response measures is also observed for larger levels of drift. These results indicate that because the current assessment methodologies do not capture the effects of ground motion duration, both performance-based and code-based assessment methodologies should be revised to consider damage measures that are sensitive to duration. Copyright (c) 2016 John Wiley & Sons, Ltd
机译：本文提供了一项分析研究，使用Northridge之前的代码，评估了地震动持续时间对3层，9层和20层SAC抗弯钢框架结构的结构破坏的影响，该建筑是为美国华盛顿州西雅图市设计的。建筑物的二维非线性有限元模型用于估计地震动引起的破坏。一组44个地面运动用于研究频谱加速度和地面运动的显着持续时间对漂移和破坏措施的综合影响。此外，选择了10个频谱等效的短时浅地壳运动和长时俯冲带记录，以隔离时效并评估其对响应的影响。对于每个地面运动对，至少要在20个强度级别上执行增量动态分析，并跟踪诸如峰值层间漂移比和耗能等响应措施。这些响应措施组合为两个破坏指标，这些指标考虑了延性和能量耗散。结果表明，地面运动的持续时间尤其会影响组合的破坏措施，尽管对于较大程度的漂移，也会观察到基于漂移的响应措施的某些影响。这些结果表明，由于当前的评估方法无法捕获地震动持续时间的影响，因此应修改基于性能的评估方法和基于规范的评估方法，以考虑对持续时间敏感的破坏措施。版权所有（c）2016 John Wiley＆Sons，Ltd

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