土-相邻结构相互作用子结构振动台试验研究

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (4) : 207-214.

论文

何涛，姜南

作者信息 +

A substructure shaking table test of soil-adjacent structure interaction

HE Tao,JIANG Nan

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文章历史 +

摘要

以土-相邻结构体系和土-单体结构体系为研究对象，依托振动台并融合子结构试验技术，通过在试验中引入分支模态方法，利用多子结构间的相互作用耦合项把地基子结构的数值计算和上部模型结构的物理试验联系起来协同分析，实现了考虑土-相邻结构相互作用（SASI）效应和土-结构相互作用（SSI）效应的子结构振动台试验。以由两个相同四层钢框架结构与地基土组成的土-相邻结构体系为例，讨论了模型结构的加速度放大系数在各地震动作用下的变化规律；对比分析了土-单体结构体系和土-相邻结构体系中模型结构的顶层位移、加速度和底部剪力，研究了SASI效应对结构动力反应的影响规律。研究表明：与土-单体结构体系相比，SASI效应使结构的地震响应峰值呈现出不同程度的下降趋势，其影响程度和地震波的频谱成分组成以及体系自身的动力特性有关。

Abstract

In this paper, the soil-adjacent structure system and the soil-monomer structure system were studied.Based on the shaking table and the substructure test technique, the branch mode method was introduced into the test.The numerical calculation of foundation soil substructure and the physical test of the upper model structure were analyzed by using the interaction coupling terms between the multiple substructures.Thus the shaking table test of the substructure considering the effect of soil-adjacent structure interaction (SASI) and soil-structure interaction (SSI) was carried out.Taking the soil-adjacent structure system composed of two identical four-story steel frame structures and foundation soil as an example, the variation law of the acceleration amplification coefficient of the model structure under various earthquake actions was discussed, and the top displacement, acceleration and bottom shear of the model structure in the soil-monomer structure system and the soil-adjacent structure system were compared and analyzed.The influence of the SASI effect on structural dynamic response was studied.The results show that, compared with the soil-monomer structure system, the SASI effect makes the peak value of the seismic response of the structure show a downward trend in varying degrees, and the degree of influence is related to the spectrum composition of the seismic wave and the dynamic characteristics of the system itself.

导出引用

何涛，姜南. 土-相邻结构相互作用子结构振动台试验研究[J]. 振动与冲击, 2020, 39(4): 207-214

HE Tao,JIANG Nan. A substructure shaking table test of soil-adjacent structure interaction[J]. Journal of Vibration and Shock, 2020, 39(4): 207-214

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