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首页> 外文会议>Coupled site and soil-structure interaction effects with application to seismic risk mitigation >LOCAL SITE EFFECTS AND SEISMIC RESPONSE OF BRIDGES
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LOCAL SITE EFFECTS AND SEISMIC RESPONSE OF BRIDGES

机译：桥梁的局部场地效应和地震响应

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摘要

The term "local site effects" is used to describe not only the potential effects of the soil stratigraphy, but the effects of the topographic irregularities and of the geomorphic conditions as well. The latter, usually characterizing an alluvial valley, tend to modify the amplitude, the frequency content, the duration, and the spatial variability of seismic ground shaking. The current study aims at shedding some light on these important issues by analyzing numerically the effects of the sub-surface geomorphic conditions of a valley on its ground surface seismic motion. Two-dimensional linear ground response analyses are performed to study an alluvial valley in Japan, the behavior of which has been monitored during many small earthquakes in the past. Additionally, equivalent-linear ground response analyses for the valley show that the potential soil nonlinearity (due to hypothetical strong shaking or highly nonlinear soil behavior) may reduce substantially the observed valley effects. Finally, as a road bridge founded on the valley has also been extensively monitored, special emphasis is given on the numerical simulation of the distress of its pile foundation and of the dynamic response of the superstructure.
机译：术语“局部场地效应”不仅用于描述土壤地层的潜在效应，而且用于描述地形不规则性和地貌条件的效应。后者通常是冲积谷的特征，往往会改变振幅，频率含量，持续时间和地震地面震动的空间变异性。当前的研究旨在通过对山谷的地下地貌条件对其地面地震运动的影响进行数值分析，从而为这些重要问题提供一些启示。进行了二维线性地面响应分析，以研究日本的冲积谷，过去在许多小地震中都对其行为进行了监测。此外，对山谷的等效线性地面响应分析表明，潜在的土壤非线性（由于假设的强烈震动或高度非线性的土壤行为）可能会大大减少所观察到的山谷影响。最后，由于对位于山谷上的公路桥梁也进行了广泛的监控，因此特别强调了其桩基遇险和上部结构动力响应的数值模拟。

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