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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >The effects of slope topography on acceleration amplification and interaction between slope topography and seismic input motion
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The effects of slope topography on acceleration amplification and interaction between slope topography and seismic input motion

机译：边坡地形对加速度放大的影响以及边坡地形与地震输入运动之间的相互作用

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摘要

Topographic effects are responsible for a multitude of earthquake-related disasters and have been used to explain some extreme recorded acceleration values. In particular, slope topography can aggravate the collapse of buildings in the vicinity of the slope. To evaluate this topographic amplification, numerical simulations were conducted with a homogeneous linear elastic slope model that was vertically subjected to scattering SV seismic waves. The numerical analyses were extended using a Gabor wavelet with different frequencies and numbers of cycles to assess the influence of seismic input motion. The results reveal how the topography affects the acceleration recorded on the ground surface of the slope, both in terms of the amplification factor and the location where the maximum amplification is observed. The maximum acceleration amplification is obtained for the slope angleα = 32.3°. Due to variations in the slope angle, the maximum amplification is not necessarily obtained at the slope crest; the slope height substantially affects the amplification magnitude but it does not affect the distribution of the peak amplification when it is larger than the wavelength of the input motion. The wave field at the slope surface could be modified depending on the ratio between the slope height and the wavelength, which affects the distribution of the peak amplification near the slope crest. In general, the results identify the effect of the interaction between slope topography and seismic waves on acceleration amplification.
机译：地形效应是众多与地震有关的灾难的原因，已被用来解释一些极端记录的加速度值。特别是，斜坡地形会加剧斜坡附近建筑物的倒塌。为了评估这种地形放大作用，使用均质线性弹性斜率模型进行了数值模拟，该模型在垂直方向上经受了SV地震波的散射。使用具有不同频率和周期数的Gabor小波扩展了数值分析，以评估地震输入运动的影响。结果揭示了地形如何影响放大率和观测到最大放大率的位置方面的坡度地面上记录的加速度。对于倾斜角α＝ 32.3°，获得最大加速度放大率。由于倾斜角的变化，在倾斜波峰处不一定获得最大的放大率。斜率高度实质上会影响放大幅度，但当其大于输入运动的波长时，它不会影响峰值放大的分布。可以根据斜坡高度和波长之间的比率来修改斜坡表面的波场，这会影响峰值在斜坡顶部附近的分布。通常，这些结果确定了坡度地形和地震波之间的相互作用对加速度放大的影响。

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