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A centrifuge-based experimental verification of Soil-Structure Interaction effects

机译：基于离心机的土壤-结构相互作用效应的实验验证

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摘要

A series of prototype dynamic centrifuge experiments is carried out to investigate the influence of soil properties and structural parameters on the Soil Structure Interaction (SSI) effect. Established analytical models are herein experimentally verified, and are proven accurate in estimating the system's natural frequency characteristics. It is observed that period elongation is strongly correlated to the relative superstructure-foundation stiffness. Although the present study deals exclusively with the small-strain near-linear range, the experimental response indicates occurrence of nonlinearity. The identified damping results remarkably larger than its analytical estimate and proves highly strain-dependent, raising questions on the reliability of existing analytical methods in capturing the actual dissipation mechanisms. An extended experimental dataset is formed under realistic stress and strain soil conditions, and is implemented, for the first time, for verification of existing analytical models offering valuable insight into the theory and serving as a benchmark for engineering practice.
机译：进行了一系列原型动态离心实验，以研究土壤性质和结构参数对土壤结构相互作用（SSI）效应的影响。建立的分析模型在此经过实验验证，并被证明在估计系统的固有频率特性方面是准确的。可以看出，周期伸长与上层建筑基础的相对刚度密切相关。尽管本研究专门研究了小应变近线性范围，但实验响应表明出现了非线性。所确定的阻尼结果明显大于其分析估计值，并证明高度依赖于应变，从而对现有分析方法在捕获实际耗散机理方面的可靠性提出了质疑。在实际的应力和应变土壤条件下形成了扩展的实验数据集，并首次实施该数据集以验证现有的分析模型，从而为理论提供了宝贵的见识，并为工程实践提供了基准。

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