Journal
SCIENCE IN CHINA SERIES E-TECHNOLOGICAL SCIENCES
Volume 52, Issue 2, Pages 518-529Publisher
SCIENCE PRESS
DOI: 10.1007/s11431-008-0303-6
Keywords
earthquake input mechanism; damage-cracking; radiation damping; contraction joints; arch dam
Funding
- National Natural Science Foundation of China [90510018, 90715041]
- National Basic Research Program of China (973) [2002CB412709]
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In this study, a nonlinear model is presented for analysis of damage-cracking behavior in arch dams during strong earthquakes using different seismic input mechanisms. The nonlinear system includes a plastic-damage model for cyclic loading of concrete considering strain softening and a contact boundary model of contraction joint opening. Two different earthquake input mechanisms are used for comparison, including massless foundation input model and viscous-spring boundary model considering radiation damping due to infinite canyon. The results demonstrate that effects of seismic input mechanism and radiation damping on nonlinear response and damage-cracking of the dam are significant. Compared with the results of using massless foundation input model, the damage-cracking region and contraction joint opening are substantially reduced when using viscous-spring boundary model to take into account radiation damping. However, if the damping ratio of the dam is artificially increased to about 10%-15% for massless foundation input model, the joint opening and damage-cracking of the dam are comparable to the results obtained from the viscous-spring boundary model.
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