百色水利枢纽进水塔结构抗震分析研究

Study on the Seismic Analysis of Intake Tower of Baise Hydroproject

用空间三维有限元方法对百色水利枢纽进水塔结构进行抗震分析研究 ,用直接滤频法按顺河向和横河向分别求出了进水塔前六阶自振频率和振型。在此基础上 ,采用完全二次型组合法对进水塔结构的地震响应进行了详细的分析研究 ,研究中考虑了塔架、底板与地基的动力相互作用 ,并考虑了水体的动力影响。最后对进水塔结构考虑动荷载、静荷载共同作用下的底板的地基承载力和整体抗倾覆稳定性进行了分析研究 ,结果表明 ,按目前设计方案进水塔结构的底板的地基承载力和整体抗倾覆稳定性均满足规范要求。

Seismic analysis of intake tower for Baise hydropower station is presented by way of three_dimensional finite element method, and the first 6_step self_vibration frequencies and the vibration modes of the intake tower are concluded by using the direct frequency filter method following river direction and transversal to river direction respectively. On this basis, detailed study on the earthquake response of the intake tower is conducted by way of full secondary combination, considering the dynamic interaction among tower structure, base plate and foundation, as well as the influence of dynamic water pressure. At last bearing capacity of foundation and the overturning_resistant stability of the tower structure under the collective action of dynamic and static load is analysed. Results of these studies show that bearing capacity of foundation and the overturning_resistant stability of the whole tower structure calculated according to the current design scheme can meet the requirements of relative specifications.