高闸墩及其上部附属结构地震响应分析

鉴于我国对上部附属结构抗震研究较少,规范中也未专门提及,由此导致设计人员进行等效静力计算时带有一定的随意性和经验性。借助有限元软件ADINA,利用动力时程分析法计算了西北地区某水电站的闸墩和框架结构,并通过各结构的动力特性和不同工况下的响应特点,探讨了地震作用下结构之间的耦联作用。结果表明,在地震作用时,质量和刚度沿竖向均存在明显突变的高闸墩和框架结构易产生类鞭梢效应的结构破坏,设计时应引起格外重视。

Earthquake Response Analysis of High Pier and Upper Auxiliary Structure

At present, there is less aseismic research on the upper auxiliary structure and has no standards for mention, so it leads to random and empirical knowledge for equivalent static calculation. Dynamic time-history method is applied to calculate pier and frame structures of a hydropower station in the northwestern districts by using ADINA software. And the coupling effect between different structures is discussed under the action of earthquake through dynamic characteristics of different structures and response characteristics at different operating conditions. The results show that under the action of earthquake, pier and frame structures with mutational mass and stiffness in vertical direction produce structural damages like whiplash effect easily. So this phenomenon must be taken a special attention when designing.