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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Dynamic stiffness of foundation embedded in layered halfspace based on wave propagation in cones
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Dynamic stiffness of foundation embedded in layered halfspace based on wave propagation in cones

机译：基于圆锥波传播的分层半空间内地基动力刚度

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摘要

The dynamic stiffness of a foundation embedded in a multiple-layered halfspace is calculated postulating one-dimensional wave propagation in cone segments. In this strength-of-materials approach the sectional property of the cone segment increases in the direction of wave propagation. Reflections and refractions with waves propagating in corresponding cone segments occur at layer interfaces. Compared to rigorous procedures the novel method based on cone segments is easy to apply, provides conceptual clarity and physical insight in the wave propagation mechanisms. This method postulating one-dimensional wave propagation in cone segments with reflections and refractions at layer interfaces is evaluated, calculating the dynamic stiffness of a foundation embedded in a multiple-layered halfspace. For sites resting on a flexible halfspace and fixed at the base, engineering accuracy (deviation of +-20%) is achieved for all degrees of freedom with a vast parameter variation. The behaviour below the cut-off frequency in an undamped site fixed at its base is also reliably predicted. The accuracy is, in general, better than for the method based on cone frustums, which can lead to negative damping.
机译：假定嵌入圆锥段中的一维波传播，可以计算嵌入多层半空间中的地基的动态刚度。在这种材料强度方法中，圆锥段的截面特性沿波传播方向增加。在相应的圆锥段中传播的波的反射和折射在层界面处发生。与严格的程序相比，基于圆锥段的新方法易于应用，在波传播机制中提供了概念上的清晰性和物理洞察力。对该方法进行了假设，该方法假设一维波在圆锥段中具有层界面处的反射和折射，从而计算了嵌入多层半空间中的地基的动态刚度。对于放置在灵活的半空间上并固定在基座上的站点，所有自由度均具有巨大的参数变化，可实现工程精度（偏差为+ -20％）。还可以可靠地预测出在固定于其基点的无阻尼位置处的截止频率以下的行为。通常，其精度要优于基于圆锥台的方法，因为它可能导致负阻尼。

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