高烈度地震区±500 kV换流站阀厅结构选型分析

Structure Selection for Valve Hall of ±500 kV Converter Station in High Intensity Earthquake Region

混合结构阀厅利用防火墙作为阀厅竖向承重及抗侧力结构的组成部分,具有结构刚度大、结构耗钢量小的优点,但其抗侧力构件平面布置不规则,地震作用下结构扭转效应明显。本文依托±500 kV金官换流站阀厅设计,开展了高烈度地震区±500 kV换流站阀厅结构选型分析工作。通过对混合结构、全钢结构进行静力、动力分析,着重研究对比了其结构刚度、承载能力及抗震性能。研究结果表明,混合结构在地震作用下的扭转反应明显,结构位移比超限,属于特别不规则结构,抗震性能较差。建议高烈度地震区±500 kV换流站阀厅采用全钢结构。

With firewall taken as vertical load-bearing and lateral force resisting structure,hybrid structure valve hall has the advantages of high structural stiffness and small steel consumption.As a result of irregular layout of lateral force resisting members,distinguished torsion response will occur under earthquake.Based on the design of valve hall of±500 kV JinGuan Converter Station,structure selection for valve hall of±500 kV converter station in high Intensity earthquake region was carried out.Through the static and dynamic analysis of hybrid structure and steel structure,the structural stiffness,bearing capacity and seismic behavior of the structure were studied.The results show that the torsion response of the hybrid structure under earthquake is obvious and the displacement ratio is beyond the limit,which leading to special irregular structure with poor seismic performance.Steel structure is recommended for valve hall of±500 kV converter station in high intensity earthquake region.