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首页> 外文期刊>Bulletin of earthquake engineering >Effects of soil-foundation-structure interaction on fundamental frequency and radiation damping ratio of historical masonry building sub-structures
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Effects of soil-foundation-structure interaction on fundamental frequency and radiation damping ratio of historical masonry building sub-structures

机译：土基 - 结构相互作用对历史砌体构建亚结构的基本频率和辐射阻尼比的影响

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摘要

Large-scale simulations and forensic analyses of the seismic behaviour of real case studies are often based on simplified analytical approaches to estimate the reduction in fundamental frequency and the amount of radiation damping induced by dynamic soil-foundation-structure (SFS) interaction. The accuracy of existing closed-form solutions may be limited because they were derived through single degree-of-freedom structural models with shallow rigid foundations placed on a homogeneous, linear elastic half-space. This paper investigates the effectiveness of those formulations in capturing the dynamic out-of-plane response of single load-bearing walls within unreinforced masonry buildings having either a shallow foundation or an underground storey embedded in layered soil. To that aim, analytical predictions based on the replacement oscillator approach are compared to results of two-dimensional dynamic analyses of coupled SFS elastic models under varying geotechnical and structural properties such as the soil stratigraphy, foundation depth and number of building storeys. Regression models and a relative soil-structure stiffness parameter are proposed to quickly predict the frequency reduction induced by SFS interaction, accounting for the presence of an embedded foundation, an underground storey and a layered soil. The effects of SFS interaction are also evaluated in terms of equivalent damping ratio, showing the limitations of simplified approaches. Since the geometric layouts considered in this study are rather recurrent in the Italian and European built heritage, the proposed procedure can be extended to similar structural configurations.
机译：实际案例研究的地震行为的大规模模拟和法医分析通常基于简化的分析方法来估计动态土 - 基础结构（SFS）相互作用诱导的基频和辐射阻尼量的降低。现有闭合溶液的准确性可能受到限制，因为它们是通过单一自由度的结构模型来源的，该结构模型具有浅刚性基础，放置在均匀的线性弹性半空间上。本文研究了这些配方在捕获单个承载壁的动态外平面响应的效果，在未原始的砌体建筑物内，该砌体建筑物具有浅基础或嵌入层状土壤中的地下楼。为此目的，基于替代振荡器方法的分析预测与耦合SFS弹性模型的二维动态分析的结果与土壤层层，基础深度和建筑店数量的结构特性下的二维动态分析。提出回归模型和相对土结构刚度参数以快速预测SFS相互作用诱导的频率减少，占嵌入式基础，地下层和层状土壤的存在。在等效阻尼比率方面还评估了SFS相互作用的影响，显示了简化方法的局限性。由于本研究中考虑的几何布局在意大利和欧洲建造的遗产中相当复发，因此可以将所提出的程序扩展到类似的结构配置。

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