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Model errors caused by rigid-foundation assumption in soil-structure interaction: a comparison of responses of a soil-structure-flexible foundation system and a rigid foundation system

机译:土壤结构相互作用刚性基础假设引起的模型误差:土壤 - 结构柔性基础系统响应的比较和刚性基础系统的响应

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摘要

This study investigates model errors caused by the rigid-foundation assumption in dynamic Soil-Structure Interaction (SSI), which has been widely accepted in the past decades to reduce computational effort. A linear two-dimensional model is used for a qualitative analysis that compares the dynamic responses of a rigid system, comprising a rigid foundation embedded in a layered half-space with a superstructure mounted on top, and a corresponding flexible system with the same parameters but a flexible foundation with a variable stiffness. The Indirect Boundary Element Method combined with non-singular Green's functions of distributed line loads is employed to calculate the system responses accurately. Transfer functions computed for a range of parameters show that the rigid-foundation assumption leads to overestimating the system natural frequency and changes the peak deformations to a different extent. It is also shown through a case study of 42 earthquakes that the rigid-foundation assumption may either overestimate or underestimate the system responses by up to approximately 50%, and in some cases even by approximately 100%, depending on the frequency content of excitation and SSI dynamic characteristics.
机译:本文研究了土-结构动力相互作用(SSI)中刚性基础假设引起的模型误差,该假设在过去几十年中已被广泛接受,以减少计算工作量。线性二维模型用于定性分析,比较刚性系统的动态响应,包括嵌入在上部结构的上层半空间中的刚性基础,以及具有相同参数但具有可变刚度的柔性基础的相应柔性系统。采用间接边界元法结合分布线荷载的非奇异格林函数精确计算系统响应。对一系列参数计算的传递函数表明,刚性基础假设会导致高估系统固有频率,并在不同程度上改变峰值变形。通过对42次地震的案例研究也表明,刚性基础假设可能会高估或低估系统响应,高达约50%,在某些情况下甚至高达约100%,这取决于激励的频率内容和SSI动态特性。

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