Plastic damage response analysis of concrete gravity dam due to obliquely incident seismic waves

被引：0
|
作者：
Li M. [1 ]
Zhang J. [1 ]
Zhang M. [1 ]
Min Q. [2 ]
Shi B. [1 ]
机构：
[1] State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin
[2] Hua Dian Heavy Industries Co. Ltd, Beijing
来源：
Shuili Xuebao/Journal of Hydraulic Engineering | 2019年 / 50卷 / 11期
关键词：
Concrete gravity dam; Oblique incidence of seismic waves; Plastic damage model; Seismic damage assessment model; Viscous-spring artificial boundary;
D O I：
10.13243/j.cnki.slxb.20190538
中图分类号：
学科分类号：
摘要：
Many concrete dams are constructed in meizoseismal area of southwest China. The dynamic response of concrete dams in complex topography condition are greatly influenced by incident angle of seismic waves. However, the related researches are mainly based on linear elastic models, which is not exactly in accordance with the actual situation. In this research, a 3D nonlinear FEM model is established based on the Koyna concrete gravity dam. The viscous-spring artificial boundary is used in the inputting of the seismic wave. The plastic damage model is adopted to analyze the dynamic response of the dam body to the oblique incidence of seismic P wave and SV wave respectively. Besides, a seismic damage assessment model is put forward to assess the damage of dams. The results show that the incident angle and type of seismic wave have a great impact on the dynamic response of the dam body. Moreover, the displacement, stress, and damage caused by P wave reach the maximum when the angle is 60°; and the displacement, stress, and damage caused by SV wave reach the maximum when the angle is 0°. Therefore, it is necessary to take the incident angle of seismic wave into consideration. It also demonstrates that the damage degree of the dam body can be reasonably evaluated by combining the plastic damage constitutive model and the damage evaluation index. Therefore, the complex input mechanism of ground motion and the dynamic resistance of materials should be comprehensively considered in the safety evaluation of similar engineering projects. © 2019, China Water Power Press. All right reserved.
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页码：1326 / 1338and1349
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