小浪底土石坝纵向振动简化动力分析

Simplified Dynamic Analysis of Longitudinal Vibration for Xiaolangdi Earth Rock Dam

采用三维剪切楔理论和ＢｕｂｎｏｖＧａｌｅｒｋｉｎ 方法，对小浪底土石坝的纵向地震反应进行简化分析，得到了该坝的最大位移、最大速度、最大加速度、最大应力等动力特性．分析成果表明，小浪底大坝的基本自振周期约为１３１９ｓ，坝顶的最大绝对加速度约为１０３６ｇ ．

By use of the 3 dimensional shear wedge theory and the Bubnov Galerkin method,a simplified dynamic analysis of longitudinal earthquake responses of the Xiaolangdi earth rock dam is made.Some dynamic characteristics,such as the maximum displacement,speed,acceleration and stress,are obtained.The analysis result shows that the fundamental frequency of the Xiaolangdi earth rock dam is about 1 319 s.Its maximum absolute acceleration at the dam crest is about 1 036 g during earthquakes.