Complex-modal-based identification method for structural dynamic characteristics of soil-structure interaction systems

被引：0
作者：
Pan D. [1 ]
Fu X. [1 ]
Tan J. [1 ,2 ]
Wang L. [2 ]
机构：
[1] Department of Civil Engineering, University of Science and Technology Beijing, Beijing
[2] Huachengboyuan Engineering Technology Group Co., Ltd, Beijing
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2023年 / 44卷 / 07期
关键词：
complex modal analysis; material damping; modal damping ratio; radiation damping; soil-structure interaction;
D O I：
10.14006/j.jzjgxb.2022.0161
中图分类号：
学科分类号：
摘要：
To identify structurally relevant modes from a lot of modes in the soil-structure interaction (SSI) system and to quantify the effect of radiation damping on structural modal damping ratio, a complex-modal-based identification method was proposed. In this method, state space method would be used to analyzed the complex modes of the finite element model of SSI including the effect of radiation damping and material damping. Then, the complex modal mass was used to identify the structural modal parameters to obtain the modal damping ratio with the effect of radiation damping. A two-degree-of-freedom soil-structure interaction model was analyzed by complex-modal-based identification method to verify that the results of complex eigenvalues of the finite element model with viscoelastic artificial boundary include the radiation damping effect. Further, the effects of radiation damping, structural material damping and soil material damping on the modal damping ratio were analyzed. Numerical results show that: the local complex modal mass ratio can effectively identify structure-related modes; the structural modal damping ratios are significantly affected by radiation damping and structural material damping; especially, the contribution of radiation damping increases with the decrease of soil shear wave velocity. © 2023 Science Press. All rights reserved.
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页码：196 / 203
页数：7
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