Air-cushion isolation effects on a concrete gravity dam

被引：0

作者：

Chen, Jiang ^{[1
,2
]}

Xiong, Feng ^{[1
,2
]}

机构：

[1] Key Laboratory of Energy Engineering Safety and Disaster Mechanics, Ministry of Education Sichuan University, Chengdu

[2] College of Architecture and Environment, Sichuan University, Chengdu

来源：

Zhendong yu Chongji/Journal of Vibration and Shock | 2014年 / 33卷 / 23期

关键词：

Cracking; Dynamic control; Hydrodynamic pressure; Seismic response; Visco-elastic artificial boundary;

D O I：

10.13465/j.cnki.jvs.2014.23.034

中图分类号：

学科分类号：

摘要：

The gas-liquid-solid tri-phase coupling numerical model for a concrete gravity dam based on air-cushion isolation control was presented here. In this model, the cracking behavior of dam concrete was considered. The radiation damping effect of the truncated boundary of the dam foundation was simulated with a visco-elastic artificial boundary condition. The 3D nonlinear simulation of air-cushion isolation effects on the concrete gravity dam was conducted for the first time. It was shown that the air-cushion reduces the hydrodynamic pressure and the acceleration response of the dam body effectively, so the cracking range of the dam body decreases; with increase in the thickness of the air-cushion, the reduction of hydrodynamic pressure and the acceleration response is more significant; the rate of reduction level decreases progressively; compared with the uniform-thickness air-cushion, the variable-thickness air-cushion can improve the utilization ratio and develop the air-cushion isolation effects more effectively. In the various cases here, the maximum hydrodynamic pressure is reduced by 50% approximately, the maximum dam peak acceleration is reduced by more than 30% with the variable-thickness air-cushion. ©, 2014, Chinese Vibration Engineering Society. All right reserved.

引用

页码：190 / 194and206

共 12 条

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