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Practical dynamic analysis model of rocking foundations under earthquake excitation
Soil Dynamics and Earthquake Engineering ( IF 4 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.soildyn.2020.106383
Jiunn-Shyang Chiou , Wun-Sian Hu , Yi-Wun Jheng

Abstract To assess the performance of a structure with spread footings under seismic loading, considering the rotation and settlement of the footings caused by rocking is essential. Based on the beam-on-a-nonlinear Winkler foundation model, this study develops a practical approach to simulate the seismic responses of bridge columns with spread footings, including the footing settlement and rotation and the accelerations of the structure, by employing structural elements that are readily available in most commercial structural analysis software. To effectively simulate the footing settlement behavior, the nonlinear backbone curve and load-unloading stiffness of vertical springs for the foundation soil are crucial. These are determined based on plate load testing. The proposed approach was verified by simulating a single column-footing model under different excitation histories in shaking table testing. The results were in reasonable agreement with the actual measurements. Parametric studies were conducted to explore the characteristics of the proposed model, including calibration of subgrade stiffness with plate load testing, unloading stiffness of soil, system frequency and viscous damping ratio for the dashpot damping coefficient, and types of hysteretic models.

中文翻译:

地震激发下摇摆地基实用动力分析模型

摘要 为了评估地震荷载作用下扩展基础结构的性能,考虑摇摆引起的基础的旋转和沉降是必不可少的。基于梁上非线性 Winkler 基础模型,本研究开发了一种实用的方法来模拟具有扩展基础的桥柱的地震响应,包括基础沉降和旋转以及结构的加速度,通过采用以下结构元素在大多数商业结构分析软件中都可以轻松获得。为了有效模拟基础沉降行为,地基土的非线性主干曲线和垂直弹簧的加载卸载刚度至关重要。这些是基于板负载测试确定的。通过在振动台测试中模拟不同激励历史下的单个柱脚模型,验证了所提出的方法。结果与实际测量结果合理一致。进行了参数研究以探索所提出模型的特征,包括通过板载荷测试校准路基刚度、土壤卸载刚度、系统频率和阻尼系数的粘性阻尼比,以及滞回模型的类型。
更新日期:2021-01-01
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