论文部分内容阅读
本文通过不同地震波输入的振动台模型试验,得到模型坝的加速度分布资料,研究测点位置、台面地震波强度、地震波类型、多向输入、先期振动和蓄水等因素对加速度放大倍数分布的影响。研究表明:(1)坝体地震动加速度反应在河谷坝段最为强烈,且随所处坝体部位高度的增加而增强;(2)对相同高程上各点,以中心线坝体测点加速度反应最小,上、下游次之,整个坝体的表面放大效应明显;(3)地震波类型对加速度放大倍数和分布有重要影响,集中体现在地震波卓越频率与坝体自振频率的关系上;(4)随输入地震峰值加速度的增大,坝体各点加速度放大倍数有减小的趋势;(5)垂直方向(z向)地震动有加大顺河水平向(x向)加速度反应的作用,特别是在坝顶表现比较明显;(6)先期振动会引起坝体后续地震动加速度反应的增大;(7)坝体的加速度反应在空库时比满库蓄水时强烈。
In this paper, we get the acceleration distribution data of model dam by shaking table model tests with different seismic waves input, and study the influence of measuring point position, mesa intensity, seismic wave type, multi-directional input, pre-vibration and water storage on the acceleration magnification distribution. The results show that: (1) The dam acceleration response is the most intense in the valleys of the valley and increases with the height of the dam body; (2) For each point on the same elevation, the acceleration response (3) The types of seismic waves have an important influence on the magnification and distribution of accelerations, which are mainly reflected in the relationship between the seismic frequency and the natural frequency of the dam; (4) ) With the increase of the input peak acceleration, the acceleration magnification at each point of the dam tends to decrease. (5) The vertical (z) earthquakes have the effect of accelerating the horizontal (x-direction) Especially in the top of the dam; (6) The initial vibration will cause the increase of the post-earthquake acceleration response of the dam; (7) The acceleration response of the dam is stronger than that of the full-bank reservoir in the empty reservoir.