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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Regional seismic responses of shallow basins incorporating site-city interaction analyses on high-rise building clusters
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Regional seismic responses of shallow basins incorporating site-city interaction analyses on high-rise building clusters

机译：浅层盆地的区域地震反应在高层建筑集群上纳入现场城市互动分析

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This study assesses the 3D amplification effects in shallow basins and quantifies the effects of site-city interaction (SCI) on high-rise buildings. A regional-scale 3D spectral element simulation is conducted on the Tuen Mun-Yuen Long basin, which contains multiple subbasins with heterogeneous and nonlinear soil profiles, while 3D city models with various building layouts are fully integrated into the basin model for our SCI study. We found a good correlation between spectral amplification factors and soil depths. Site response is significantly amplified at basin edges and centers due to surface waves generated at basin edges and the focusing effects stemming from 3D basin geometry. Transfer functions of 3D basins can be up to fourfold at fundamental frequencies as compared to 1D response, and further amplifications occur at high frequencies due to surface waves. In the SCI simulations, we observe wave trapping in the open space amid buildings resulting in energy concentration and up to twofold PGA amplifications. The wave trapping effect diminishes as the space between buildings increase beyond their range of influence (similar to 100 m). The SCI analyses show that destructive kinetic energy in superstructures increases 28% in one horizontal direction but decreases 22% in the other. Our study concluded that, 1D site response analysis can significantly underestimate the seismic demand in shallow basins. Site-city interaction of high-rise buildings increases the short-period spectra of ground motions, leading to an increase in their story accelerations by up to 50% and to a substantial decrease in the seismic safety of short structures in their vicinity.
机译：本研究评估了浅层盆地中的3D扩增效果，并量化了现场城市互动（SCI）对高层建筑的影响。区域规模的3D光谱元素仿真在屯门 - 元长盆地进行，其中含有多种具有异构和非线性土壤剖面的子酶，而具有各种建筑布局的3D城市模型完全集成到盆地模型中为我们的SCI研究。我们发现光谱放大因子和土壤深度之间的良好相关性。由于在盆地边缘处产生的表面波以及从3D盆地几何产生的聚焦效应，因此在盆地边缘和中心显着放大了站点响应。与1D响应相比，3D盆地的传递函数可以在基本频率下高达四倍，并且由于表面波，在高频处发生进一步的扩增。在SCI模拟中，我们观察在建筑物中的开放空间中的波浪俘获，导致能量集中和高度的PGA扩增。波捕获效果随着建筑物之间的空间增加超过其影响范围（类似于100米）而减少。 SCI分析表明，上部结构中的破坏性动能在一个水平方向上增加了28％，但另一个水平方向增加了22％。我们的研究得出结论，1D站点响应分析可以显着低估浅层盆地的地震需求。现场城市的高层建筑的互动增加了地面运动的短期谱，导致其故事加速度增加到50％，并在其附近的短结构的地震安全性下降。

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