A simplified three-parameter model for analyzing torsional vibration of rectangular foundations on layered soil

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations Pub Date : 2024-04-10 DOI:10.1016/j.sandf.2024.101460

Shi-Shuenn Chen , Chi-Jou Kao , Jun-Yang Shi

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引用次数: 0

Abstract

Dynamic soil-structure interaction (SSI) significantly impacts structural vibration. Over the past few decades, numerous simplified models were developed to analyze dynamic SSI on homogeneous soil. In this study, however, a lumped-parameter model is adopted to investigate the dynamic behavior of rectangular foundations overlying nonuniform soil. The simplified three-parameter model is utilized to analyze the torsional vibration of rectangular foundations on layered soil with linearly varying shear-wave velocities. Non-dimensional parameters (shear-wave velocity ratios, layer depth ratios, and mass ratios) are also investigated herein. The frequency-magnification curves of the foundation using three-parameter model are found to agree well with theoretical solutions. Consistent agreements are also observed at the resonant response and its corresponding frequency ratio. Additionally, the resultant resonant magnification factors against mass ratios clearly show the impacts of the whipping effect resulting from soil-foundation interactions. The proposed model excels in simulating layered soil and includes fewer parameters than existing lumped-parameter models. The proposed model also demonstrates the adaptivity and reliability to simulate the dynamic responses calculated from the published in-situ experimental data. The time-domain application based on the proposed model effectively estimates the structural displacement of the soil-foundation-superstructure system. This research could contribute to the SSI analysis regarding the torsional vibration of a foundation on nonuniform soil.

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用于分析层状土上矩形地基扭转振动的简化三参数模型

动态土-结构相互作用（SSI）对结构振动有重大影响。在过去的几十年里，人们开发了许多简化模型来分析均质土壤上的动态 SSI。然而，本研究采用了一个总参数模型来研究覆盖在非均匀土壤上的矩形地基的动态行为。简化的三参数模型用于分析矩形地基在剪切波速度线性变化的层状土壤上的扭转振动。本文还研究了非尺寸参数（剪切波速度比、层深度比和质量比）。使用三参数模型得出的地基频率放大曲线与理论解十分吻合。在共振响应及其相应的频率比上也观察到了一致的结果。此外，根据质量比得出的共振放大系数清楚地显示了土壤-地基相互作用产生的鞭打效应的影响。所提出的模型在模拟分层土壤方面表现出色，与现有的整块参数模型相比，所包含的参数更少。所提出的模型还证明了其适应性和可靠性，可以模拟根据已公布的现场实验数据计算出的动态响应。基于所提模型的时域应用可有效估算土壤-地基-上部结构系统的结构位移。这项研究有助于对非均匀土壤上地基的扭转振动进行 SSI 分析。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Soils and Foundations 工程技术-地球科学综合

CiteScore

6.40

自引率

8.10%

发文量

审稿时长

5 months

期刊介绍： Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.