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Soil-pile-structure interaction under SH wave excitation

机译：SH波激励下土-桩-结构相互作用

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摘要

A continuum model for the interaction analysis of a fully coupled soil-pile-structure system under seismic excitation is presented in this paper. Only horizontal shaking induced by harmonic SH waves is considered so that the soil-pile-structure system is under anti-plane deformation. The soil mass, pile and superstructure were all considered as elastic with hysteretic damping, while geometrically both pile and structures were simplified as a beam model. Buildings of various heights in Hong Kong designed to resist wind load were analysed using the present model. It was discovered that the acceleration of the piled-structures at ground level can, in general, be larger than that of a free-field shaking of the soil site, depending on the excitation frequency. For typical piled-structures in Hong Kong, the amplification factor of shaking at the ground level does not show simple trends with the number of storeys of the superstructure, the thickness and the stiffness of soil, and the stiffness of the superstructure if number of storeys is fixed. The effect of pile stiffness on the amplification factor of shaking is, however, insignificant. Thus, simply increasing the pile size or the superstructure stiffness does not necessarily improve the seismic resistance of the soil-pile-structure system; on the contrary, it may lead to excessive amplification of shaking for the whole system.
机译：提出了地震耦合作用下全耦合土-桩-结构系统相互作用分析的连续模型。仅考虑了谐波SH波引起的水平振动，从而使土-桩-结构系统处于反平面变形状态。土的质量，桩和上部结构都被考虑为具有滞回阻尼的弹性，而桩和结构的几何形状都简化为梁模型。使用本模型分析了香港不同高度的建筑物，这些建筑物旨在抵抗风荷载。已经发现，取决于激励频率，桩结构在地面上的加速度通常可以大于土壤场地的自由场振动的加速度。对于香港的典型堆积结构，地面震动的放大系数并未显示出简单的趋势，即上层建筑的层数，土壤的厚度和刚度，以及上层建筑的刚度（如层数）是固定的。但是，桩刚度对振动放大系数的影响微不足道。因此，仅仅增加桩的尺寸或上部结构的刚度并不一定会提高土桩结构系统的抗震性。相反，它可能导致整个系统的振动过度放大。

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