土与一般平面不对称结构地震动力相互作用研究

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (9) : 118-124.

论文

土与一般平面不对称结构地震动力相互作用研究

甘志兴 ,李春祥

作者信息 +

Seismic behaviors of general asymmetric-plan structures considering soil-structure interaction

LI Chun-xiang，GAN Zhi-xing

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文章历史 +

摘要

为更精确分析结构各层质量中心偏心对结构平移-扭转耦合地震响应影响，提出分析土与一般质量偏心结构地震动力相互作用的基本框架。用极坐标建立双向地震作用下两层一般平面不对称结构（GAS）（六个自由度）动力方程；用五个自由度土阻抗函数表征土与一般平面不对称结构相互作用；建立土与一般平面不对称结构相互作用（SGASI）动力方程。用SGASI系统标准化均方根位移与加速度分析地震动力的相互作用。通过设置不同质量偏心位置，数值研究在双向地震作用下，考虑土与结构相互作用的单轴、非同轴质量偏心对结构平-扭耦合地震响应影响。

Abstract

In order to more accurately analyze the coupled lateral-torsional seismic responses of a structure whose mass centers at different floors are not located on a single vertical axis, a basic framework of analyzing the seismic dynamic interaction of the soil-general mass eccentric structure is presented here. First, use the polar coordinates to develop the dynamic equations of a two-storey general asymmetric-plan structure (GAS) with the 6-degree-of-freedom (6DOFs) under the bi-directional earthquakes. Then, with resorting to the 5DOF soil impedance functions，characterize the soil-general asymmetric-plan structure interaction (SGASI). Finally, integrate the dynamic equations of both the GAS and soil-foudation+superstructure (whole) interaction. The normalized root-mean-square (RMS) seismic displacement and acceleration responses of the SGASI system are derived. Numerical study on the effects of both the single-axis and non-coaxial mass eccentricities on the coupled lateral-torsional seismic responses are analyzed through setting up different locations of mass eccentricity under the bi-directional earthquakes.

导出引用

甘志兴;李春祥. 土与一般平面不对称结构地震动力相互作用研究[J]. 振动与冲击, 2013, 32(9): 118-124

LI Chun-xiang;GAN Zhi-xing. Seismic behaviors of general asymmetric-plan structures considering soil-structure interaction[J]. Journal of Vibration and Shock, 2013, 32(9): 118-124