滩坑水电站分层取水进水塔地震响应计算

Study of seismic response calculation for variable elevation intake tower at Tankeng Hydropower Station

首先采用附加质量法对滩坑水电站分层取水进水塔的自振特性进行了计算,然后根据《水工建筑物抗震设计规范》中的地震加速度谱,采用振型分解法计算了该塔的地震响应.计算结果表明,这种高耸格构式岸塔是一种位于水中纵、横向刚度都较小的柔性结构;进水塔的位移与应力最大部位主要发生在横、纵梁塔壁连接处,以及塔壁与下游侧边坡的连接处,进水塔主体应力很小,说明在地震作用下进水塔结构是安全的,其计算结果已被该工程设计所采用.

The natural vibration characteristics of variable elevation intake tower at Tankeng Hydropower Station are calculated by using additive mass method.And then,based on the earthquake acceleration spectrum in aseismic design code of hydraulic structures,seismic response calculation of the tower is carried out by using mode-superposition method.Numerical solutions are presented in which the lattice type tower is a flexible structure with lower stiffness in both longitudinal and transverse directions in water.What＇s more,the regions of maximal displacements and stresses mostly occur in the joint of tower walls in two directions and the joint of tower wall and downstream side slope as well.It is safe in the earthquake action because the stresses in main parts of the intake tower are small.The results have been adopted by the project designers.