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中文摘要：
在水下爆炸冲击荷载作用下,结构动力响应较之静态荷载和地震荷载作用下要复杂得多。通过大量的数值模拟,探讨了混凝土重力坝在水下爆炸冲击荷载作用下,大坝高度、库前水位对大坝抗爆性能的影响,为大坝抗爆性能评估和防护设计提供基础。数值计算中,构建了重力坝水下爆炸全耦合数值模型,并考虑爆炸冲击作用下混凝土的高应变率效应。研究结果表明：对于混凝土重力坝,随着大坝高度的增加,大坝的抗爆性能增强;库前水位对大坝的抗爆性能影响较大,通过降低库前水位可有效提高大坝的抗爆性能。
英文摘要：
The dynamic responses of structures under blast loading are much more complicated than those under other loadings such as static and earthquake loadings.In order to fully realize the blast resistances of concrete gravity dams,a great many numerical simulations were implemented by using three-dimensional nonlinear finite element models.The influences of dam height and water level before the dams on the blast resistance of the dams were analyzed,and a theoretical basis was provided for antiknock performance evaluation and protection design.Strain rate effects of concrete dams were taken into consideration in the establishment of the fully-coupled model for the gravity dams.For this kind of concrete gravity dams,numerical results indicate that the blast resistance of the low dams is weaker than that of the high dams,that the water level before the dams plays an important role on the antiknock performances of the dams,and that the antiknock performances of the dams can be effectively improved by reducing the water level.
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