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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Variability of near-fault seismic risk to reinforced concrete buildings based on high-resolution physics-based ground motion simulations
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Variability of near-fault seismic risk to reinforced concrete buildings based on high-resolution physics-based ground motion simulations

机译：基于高分辨率物理基础运动模拟的钢筋混凝土建筑物近断层地震风险的变异性

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Broadband physics-based simulated earthquake ground motions are utilized to characterize the regional-scale seismic risk to modern reinforced concrete (RC) structures. A highly dense dataset of ground motions covering a 100-km x 40-km domain was generated using kinematic fault rupture models with varying rupture characteristics to represent shallow crustal earthquakes and resolved up to frequencies of 5 Hz. Over 40,000 nonlinear response history simulations of short- and mid-rise RC special moment frame buildings were conducted using simulation models that are capable of representing nonlinear behavior and component deterioration effects. The spatial variability of structural risk within a single earthquake scenario and between different rupture scenarios is examined, and the regions of strongest directivity effects and highest structural demands are identified. The structural demands may vary by factor of up to 8.0 at very short distances from the fault, and the large dispersion in the demands decreases significantly beyond a distance of 15 km. The interstory drift and member rotation demands are substantially impacted by important features of the geological structure and the characteristics of the rupture scenarios, particularly the presence of localized high-slip regions. The frequency characteristics of the structures are found to play an important role in determining the effects of near-fault ground motions on the structural response and expected damage. The results of this study suggest that the simulated ground motions, particularly those generated using the hybrid rupture approach, may offer reasonable structural risk estimates for low-frequency structures and conservative estimates for high-frequency structures.
机译：基于宽带物理的模拟地震地面运动用于表征现代钢筋混凝土（RC）结构的区域规模地震风险。使用具有不同破裂特性的运动故障破裂模型产生覆盖100 km×40公里域域的高度密度的地面图案。代表浅地地震，并决定频率为5 Hz。使用能够代表非线性行为和组件恶化效果的仿真模型进行短期和中层RC特殊力矩框架建筑物的超过40,000个非线性响应历史模拟。检查了单个地震场景和不同破裂情景之间结构风险的空间可变性，并确定了最强的方向性效应和最高结构需求的区域。结构需求可能在故障距离非常短的距离下变化高达8.0，因此需求的大分散显着降低超过15公里。颠覆漂移和成员旋转需求基本上受到地质结构的重要特征和破裂情景的特征的影响，特别是局部高净化区域的存在。发现结构的频率特性在确定近故障地面运动对结构响应和预期损坏的影响方面起着重要作用。该研究的结果表明，模拟地面运动，特别是使用混合破裂方法产生的地面运动，可以为低频结构和保守估计提供合理的结构风险估计和高频结构。

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