设有横缝的高拱坝地震反应分析方法

文中介绍了两种模拟拱坝径向横缝的力学模型，应用非直接对接的自由子结构方法，在模态子空间内建立了拱坝地震反应分析的非线性动力方程，提出了考虑动水压力影响的近似计算方法。最后通过算例说明不同径向横缝模型对拱坝地震反应的影响。

An approach to seismic response analysis of high arch dams with contraction joints

Two mathematical models for simulating the opering and closing of contraction joints in normal direction in arch dams are presented in this paper. Applying the modal synthesis technique of free-substructures without directly coupling, the nonlinear equations of motion for seismic response analysis of arch dams is established in the new generalized coordinates spaced by the truncated modes of all monoliths substructures. Furthermore, a new approach, the modal perturbation method, is suggested to calculate approximately the effect of the dynamic pressure on the seismic responses of arch dams. The numerical results of a simple example show that different models of the contraction joints have significant influences on the seismic responses of the arch dams.