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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Impacts of simulated M9 Cascadia Subduction Zone earthquakes considering amplifications due to the Georgia sedimentary basin on reinforced concrete shear Avail buildings
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Impacts of simulated M9 Cascadia Subduction Zone earthquakes considering amplifications due to the Georgia sedimentary basin on reinforced concrete shear Avail buildings

机译：模拟M9 Cascadia俯冲区地震考虑扩大的模拟M9 Cascadia俯冲区域因钢筋混凝土剪切利用建筑物的格鲁吉亚沉积盆地引起的扩增

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摘要

Southwest British Columbia has the potential to experience large-magnitude earthquakes generated by the Cascadia Subduction Zone (CSZ). Buildings in Metro Vancouver are particularly vulnerable to these earthquakes because the region lies above the Georgia sedimentary basin, which can amplify the intensity of ground motions, particularly at medium-to-long periods. Earthquake design provisions in Canada neglect basin amplification and the consequences of accounting for these effects are uncertain. By leveraging a suite of physics-based simulations of M9 CSZ earthquakes, we develop site-specific and period-dependent spectral acceleration basin amplification factors throughout Metro Vancouver. The M9 simulations, which explicitly account for basin amplification for periods greater than 1s, are benchmarked against the 2016 BC Hydro ground motion model (GMM), which neglects such effects. Outside the basin, empirical and simulated seismic hazard estimates are consistent. However, for sites within the basin and periods in the 1-5 s range, GMMs significantly underestimate the hazard. The proposed basin amplification factors vary as a function of basin depth, reaching a geometric mean value as high as 4.5 at a 2-s period, with respect to a reference site located just outside the basin. We evaluate the impact of the M9 simulations on tall reinforced concrete shear wall buildings, which are predominant in the region, by developing a suite of idealized structural systems that capture the strength and ductility intended by historical seismic design provisions in Canada. Ductility demands and collapse risk conditioned on the occurrence of the M9 simulations were found to exceed those associated with ground motion shaking intensities corresponding to the 975 and 2475-year return periods, far exceeding the similar to 500-year return period of M9 CSZ earthquakes.
机译：西南哥伦比亚州西南哥伦比亚有可能经历由Cascadia俯冲区（CSZ）产生的大幅度地震。地铁温哥华的建筑特别容易受到这些地震的影响，因为该地区位于格鲁吉亚沉积盆地之上，这可以放大地面运动的强度，特别是在长期期间。加拿大疏忽盆地扩增的地震设计规定以及对这些效果的核算后果是不确定的。通过利用基于M9 CSZ地震的基于物理的模拟，我们在整个温哥华开发了特定于特定的依赖谱加速盆地放大因子。 M9模拟，明确地占盆地放大的时间表大于1S，是根据2016年BC水电地面运动模型（GMM）的基准，这些模型忽略了这些效果。在盆地外，经验和模拟地震危险估计是一致的。但是，对于盆地内的网站和1-5秒的范围内，GMMS明显低估了危险。所提出的盆地扩增因子作为盆深度的函数变化，在2-S时段达到高达4.5的几何平均值，相对于位于盆地外的参考现场。我们通过开发一套理想化的结构系统，评估M9模拟在该地区主要在该地区主要的钢筋混凝土剪力墙建筑物的影响。捕捉加拿大历史地震设计规定的强度和延展性的理想结构系统。发现延展性需求和崩溃风险调节的M9模拟的发生量超过与975和2475年回报期对应的地面运动震荡强度相关的那些，远远超过了M9 CSZ地震的500年返回期。

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