高拱坝动力特性与动力响应模型试验研究

Experimental Study of Dynamic Characteristics and Dynamic Response Model of High Arch Dam

高拱坝的动力破坏特性越来越受到关注,动力特性和动力响应是其研究的一个重要方面。通过模型试验的方法研究高拱坝动力特性和动力响应的特征,动力特性试验比较了完好结构与有施工横缝结构的基阶动力特性,表明当结构存在施工横缝时,结构基阶频率降低,阻尼增大。结构动力响应采用振动台模拟地震波激励,试验结果表明,完整结构与有施工缝结构动力响应具体数据不同,但规律相同。加速度最大响应沿拱顶水平向在坝中拱顶的值最大,向两边的坝肩处,加速度最大响应逐渐减小。沿拱坝垂向加速度最大响应从坝顶到基础,响应均逐渐减小。试验结果可为高拱坝结构动力安全研究提供技术依据。

The damage behavior of high arch dam caused by dynamic load attracts more and more attention at present,and it is significantly affected by dynamic characteristics and dynamic response of the structure.In this study,dynamic property and response of high arch dam was studied by model test.Dynamic experimental results show that the first order frequency of structure with contraction joints is smaller than that of intact structure,but its damping ratio is larger.Seismic experimental results indicate that the dynamic responses of structure with or without the contraction joints are different,but have same dynamic characteristics.The maximal acceleration response along horizontal direction appears at the middle part of arch top,and decreases gradually along both dam shoulder.The maximal acceleration response along vertical direction decreases gradually from the dam top to bottom.These experimental results may provide technical basis for dynamic safety study of high arch dam.