特高压换流站低端阀厅隔震设计及地震响应分析

Isolation design and seismic response analysis of low-end valve hall of UHV converter station

低端阀厅作为换流站最为重要的建筑结构之一,具有跨度大,结构复杂,抗震性能要求高等特点。以新松换流站低端阀厅为研究对象,首先结合现场动力测试数据研究了低端阀厅抗震薄弱环节,然后对低端阀厅进行了隔震层设计,最后开展了Ⅸ度设防和罕遇地震下低端阀厅结构的动力响应计算,对比分析了隔震前后低端阀厅关键部位的加速度、位移及基底剪力响应。结果显示:低端阀厅动力特性测试和原结构的模态分析结果较为一致,而采用隔震设计的低端阀厅基频从2.7Hz降到0.6Hz,基本避开了地震卓越周期。基础隔震能使结构的水平加速度和基底剪力大幅度减小,结构变形主要集中在隔震层,低端阀厅自身变形很小,隔震效果在70%左右,显著提高了低端阀厅的抗震性能。

As one of the most important structures of converter station,the low-end valve hall has the characteristics of large span,complex structure and high seismic performance requirements.Low-end of the valve hall with Xinsong converter station as the research object,firstly,based on the field dynamic test data,the seismic weak link of low-end valve hall is studied,and then the isolation layer of low-end valve hall is designed Finally,the dynamic response calculation of low-end valve hall structure under IX degree fortification and rare earthquake is carried out,and the acceleration,displacement and base shear response of key parts of low-end valve hall before and after isolation are compared and analyzed.The results showed that the dynamic characteristic test of the low-end valve hall was consistent with the modal analysis results of the original structure,while the base frequency of the low-end valve hall designed with isolation dropped from 2.7 Hz to 0.6 Hz,basically avoiding the seismic excellent period.The foundation isolation can greatly reduce the horizontal acceleration and base shear of the structure,and the structural deformation is mainly concentrated in the isolation layer.The low end valve hall itself has little deformation,and the isolation effect is about 70%,which significantly improves the seismic performance of the low end valve hall.