重力坝坝踵界面裂缝的地震断裂分析
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摘要
针对有限元方法计算异弹模界面裂缝程序繁琐的问题 ,利用特解边界元法 ,对重力坝坝踵区界面裂缝在地震作用下的应力强度因子变化规律进行了探讨 ,得出了应力强度因子KⅠ ,KⅡ ,K0 随弹模比的增加而减少 ,随裂缝长度的增加而增加 ,地震动水压力对重力坝裂缝影响较大 .算例表明 ,特解边界元法是计算非均质裂缝动态断裂的有效方法
It is more complicated to use Finite Element Method to calculate bimaterial interfacial crack Under earthquake act, the changing law of dynamic stress intensity factors for interfacial crack in the vicinity of gravity dam heel is discussed by Particular Solution Boundary Element Method (PSBEM) Stress intensity factors K Ⅰ?K Ⅱ and K 0 decrease as the ratio of elastic module increases, whereas they increase as the crack increases Earthquake hydrodynamic pressure has great influence on the heel crack of gravity dam Example indicates that PSBEM is a valid method, which is worth recommending for engineering use.
It is more complicated to use Finite Element Method to calculate bimaterial interfacial crack Under earthquake act, the changing law of dynamic stress intensity factors for interfacial crack in the vicinity of gravity dam heel is discussed by Particular Solution Boundary Element Method (PSBEM) Stress intensity factors K Ⅰ?K Ⅱ and K 0 decrease as the ratio of elastic module increases, whereas they increase as the crack increases Earthquake hydrodynamic pressure has great influence on the heel crack of gravity dam Example indicates that PSBEM is a valid method, which is worth recommending for engineering use.
引文
[1] 李庆斌,周鸿钧,林 皋,等.特解边界元法及其工程应用[M].北京:科技文献出版社,1992
[2] 张五岳,周蔚晴,周鸿钧.边界元法计算异弹模界面裂缝应力强度因子[J]郑州工业大学学报,2001,22(2):50-53
[3] 梁岗,周鸿钧,李庆斌粘弹性非均质裂缝缝端动态应力强度因子计算[J]工程力学,1995,(增刊):379-383.
[2] 张五岳,周蔚晴,周鸿钧.边界元法计算异弹模界面裂缝应力强度因子[J]郑州工业大学学报,2001,22(2):50-53
[3] 梁岗,周鸿钧,李庆斌粘弹性非均质裂缝缝端动态应力强度因子计算[J]工程力学,1995,(增刊):379-383.
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