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水电站泄洪洞进水塔作为地下隧洞的首部结构,其安全性关系到整个水电站的安全和效益。采用大型三维有限元程序ANSYS对某水电站泄洪洞进水塔结构进行了抗震分析,计算分析了进水塔结构的自振特性,通过反应谱法计算了在顺水流方向、垂直水流方向和竖直方向地震共同作用下进水塔结构的动位移、动应力分布等动力响应情况,并将动力计算结果与静力计算结果进行叠加,评估了进水塔结构抗震性能。结果表明,进水塔结构的变形与强度均能满足要求,但其抗震薄弱部位应力较大,在结构设计时需采取特殊措施以确保塔体结构的安全。
As the first structure of underground tunnel, the safety of water discharge tower of hydropower station is related to the safety and benefit of the whole hydropower station. The large-scale three-dimensional finite element program ANSYS was used to analyze the structure of the intake spillway tower of a hydropower station. The self-vibration characteristics of the intake tower structure were calculated and analyzed. The response spectrum method was used to calculate the vertical vibration direction of the spillway tunnel. Dynamic response of dynamic displacement and dynamic stress distribution of inlet tower under directional earthquake are summed up. The dynamic calculation results and static calculation results are superposed to evaluate the seismic performance of intake tower structure. The results show that the deformation and strength of the inlet tower can meet the requirements, but the stress in the weak earthquake site is large. Special measures must be taken in structural design to ensure the safety of the tower structure.