高海拔寒冷地区某水电站泄洪洞进水塔抗震安全分析

Seismic Safety Analysis of the Flood Discharge Tunnel Inlet Tower of a Hydropower Station in High-altitude Cold Area

水电站建筑物中,泄洪洞进水塔结构为重要建筑物,保证水电站泄洪功能的实现。某水电站位于高海拔寒冷地区,泄洪洞进水塔工程规模大,塔体高90 m。采用三维有限元法,考虑高海拔对重力加速度的修正,考虑寒冷地区水库库周冰层对塔体的冰压力作用,应用振型分解反应谱法计算塔体的动态响应,论证其抗震安全性。结果表明,该高海拔寒冷地区进水塔在地震作用下是安全的,满足抗震要求。

In the hydropower station structures,the flood discharge tunnel inlet tower is an important structure to guarantee the flood discharge function of the hydropower station.A hydropower station is located in high-altitude cold area,and the flood discharge tunnel inlet tower is a large-scale project with the tower body of 90 m high.Based on the three-dimensional finite element method,considering the correction of gravitational acceleration at high altitude and the ice pressure effect of the ice layer around the reservoir in cold areas,the dynamic response of the tower is calculated by mode-superposition response spectrum method,and its seismic safety is demonstrated.The results show that the inlet tower in the cold area at high altitude is safe under the action of earthquake and meets the seismic requirements.