【摘要】 以某典型混凝土曲线重力坝为例,充分考虑坝体、推力墩、溢流墩和岩基的相互作用,采用空间组合有限元直接滤频法求解地基—坝体系统的自振频率、周期和振型,按振型分解反应谱法计算地基—坝体系统的地震反应。结果表明,地基—坝体系统前6阶振型的振动主要是坝体的整体振动,而后面的高阶振动则主要是以坝顶或下游表面溢流墩的局部振动为主,地基的振动量很小;正常水位下地震时坝体的最大动位移发生在坝顶的顺河流向,最大值为22.1mm,地基的位移很小;正常水位下地震时坝体的最大动应力分量发生在靠右岸2/3高程附近的横河流向,最大值为2.78MPa。更多还原

【Abstract】 Based on three-dimensional integrated finite element method,the dynamic characteristics and the seismic response of a typical curved gravity dam is studied and analyzed.The free-vibration frequencies,vibration modes and the seismic response of the dam-foundation system are obtained.The numerical model has taken into account the interaction between the foundation and the dam body,the influence of the major faults in the foundation,the structural interfaces and the strengthening measurement.The numerical results show that the global dynamic response of the dam is controlled by the 6lower-order frequencies;the following higher-order frequencies of the system are mainly related to the local vibration of the parts of the dam with very small foundation movement;under the combination of the normal water level and earthquake,the maximum dynamic displacement is 22.1mm,which occurs at the top of the dam along the river direction;the displacement in the foundation is very small;the maximum dynamic stress component reaches 2.78MPa,which appears in the cross-river direction,in the dam about 2/3of the dam height near the right-hand side bank.更多还原