中文摘要：

结合高拱坝动力研究中的实际问题，提出了一种考虑横缝键槽非线性影响的接触模型，能够真实反应拱坝横缝的实际受力特点，并采用ANSYS程序的二次开发将其实现。用此模型对溪洛渡拱坝横缝进行了模拟，计入强震影响，比较4种工况下的拱坝动力特性，得到一些有益的结果。数值试验表明，横缝削弱了拱坝的整体性，使得拱向应力释放，地震过程中中缝开度大于侧缝。

英文摘要：

Based on the practical problems existing in dynamic research on high arch dams, a contact model is established considering the nonlinear effects of keyslots which can reflect the actual mechanical characteristics of transverse joints, At the same time, it is programmed and realized by the APDL of ANS~S. This model is applied in the simulation of transverse joints of Xiluodu Arch Dam, taking into account the influence of strong earthquake. Through comparisons of arch dam dynamic behaviors under four loading scenarioes, some useful results are obtained. The numerical experimentation shows that transverse joints weaken the integrity of arch dam, release stress in arch direction, and the opening distances in the middle joints are grater than those of side ones during the process of earthquake.