【摘要】 建立有横缝拱坝的组合接触界面模型和界面间附加减震弹簧、阻尼的地震反应有限元计算模型,并将其应用于高拱坝减震措施的实际工程计算中。首先针对拱坝横缝在地震荷载作用下所处力学状态,提出一个组合的横缝非线性抗拉接触界面模型,该横缝界面模型的特点是,它即能体现横缝的强度效应,又能反映横缝被拉开后的张合、摩擦过程。在接触约束条件的罚函数处理方法基础上,建立拱坝横缝结点对之间附加减震弹簧、阻尼器的计算处理方法。在拱坝结构布置上通过布设阻尼器和弹簧的方式降低地震对拱坝强度的不良影响,达到提高坝体横缝的抗拉能力以及减震、优化高拱坝结构设计的目的。数值解计算反映出,拱坝横缝间附加弹簧、阻尼对于改善地震动作用下高拱坝结构整体的应力分布状况具有较明显效果。更多还原

【Abstract】 A finite element combined-model is proposed and employed for the seismic response of high arch-dams with vertical contraction joints connected by aseismic springs and dampers. First a dynamic nonlinear contact combined-model of vertical contraction joints with pull-resistance capability is formulated for the mechanical state of high arch dams under seismic excitation, taking into consideration of the process of the opening and friction of pull-off joints. Using the penalty method, subjecting to contact constraint conditions for pull-off joints, a numerical model is then proposed for vertical contraction joints connected with aseismic springs and dampers. The negative seismic effects to the strength of arch dams may be reduced by connecting portions of arch dams with aseismic springs and dampers, thus enhancing the pull-and earthquake-resistance capability, and optimizing the construction of arch dams.更多还原