混凝土坝动力分析的自由子结构模态综合法

Modal synthesis technique of free substructure in dynamic analysis for concrete dams

文中引入连接子结构，应用自由子结构模态综合技术分析混凝土坝的动力问题，可消除自由子结构界面自由度对模态综合的约束，从而提高综合效率．文中还讨论了弹性连接子结构、刚性连接子结构和混合型连接子结构的不同特点．通过算例表明这种计算方法具有良好的计算精度．

By introducing the link substructure,the modal synthesis technique of free substructure is applied to the dynamic analysis of concrete dams.The effect of the additional boundary degrees of freedom on the mode truncating,appeared in conventional free substructuring,can be avoided.As result,the synthetical efficiency is improved.The elastic,rigid and hybrid link substructure for coupling with the modal substructures are also discussed. Numerical examples for gravity dam and arch dam are used to illustrate the precision of the technique suggested in this paper.