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首页> 外文期刊>Bulletin of earthquake engineering >Influence of earthquake duration on structural collapse assessment using hazard-consistent ground motions for shallow crustal earthquakes
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Influence of earthquake duration on structural collapse assessment using hazard-consistent ground motions for shallow crustal earthquakes

机译：地震持续时间对浅地震危险 - 一致地层的结构崩塌评估的影响

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摘要

This study quantitatively investigates the duration effect on structural collapse assessment, using hazard-consistent ground motion suites selected based on the generalized-conditional-intensity-measure approach. Sixteen scenario cases with varying magnitudes, distances, and conditioning periods are considered as targets. For each target case, four hazard-consistent ground motion suites with different distributions of duration (one base-duration (actual target) suite and three longer-duration suites respectively) are selected. Collapse fragility curves are derived by conducting incremental dynamic analysis on numerical models of four steel frames. Comparative results demonstrate that the duration effect on structural collapse capacity mainly depends on the magnitude of the mean significant duration (Ds(5-75)) ratio of two (longer/base) groups. The duration effect is statistically insignificant for cases where the mean Ds(5-75) ratio is smaller than 1.4, while it is more significant for cases with mean Ds(5-75) ratios larger than 1.4, with a reduction in median collapse capacity of, on average, about 10% when using the longer-duration suites as compared to the base-duration one. It is also found that a longer duration record suite with more cumulative intensity contained has a higher possibility to cause a reduction of structural collapse capacity.
机译：本研究定量地研究了基于广义条件 - 强度测量方法所选择的危险 - 一致的地面运动套件对结构塌陷评估的持续时间效应。具有不同大小，距离和调节期的十六个情景案例被视为目标。对于每个目标情况，选择具有不同持续时间分布的四个危险一致的地面运动套件（分别为一个基本持续时间（实际目标）套件和三个持续时间套件）。通过对四钢框架的数值模型进行增量动态分析来推导塌陷脆弱曲线。对比结果表明，对结构塌陷能力的持续时间效应主要取决于两种（更长/碱）组的平均显着持续时间（DS（5-75））的大小。对于平均ds（5-75）的比例小于1.4的情况，持续时间效应是统计学上的，而对于大于1.4的平均ds（5-75）比率，对于平均ds（5-75）比的病例而言更加重要，中值塌陷能力与基本持续时间相比，在使用更长持续时间的套件时，平均约10％。还发现，具有更多累积强度的较长持续时间记录套件具有更高的可能性导致结构塌陷能力的可能性。

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