强震区高进水塔抗震动力分析及体型优化设计

Aseismic design analysis and shape optimization of high intake towers in meizoseismal area

以我国西南强地震高发区域正规划、设计或开工建设一批高坝大库型水电工程项目为背景,依托长河坝工程的发电引水进口塔,研究了强地震激励作用下高进水塔的力学行为和结构性能.通过三维有限元建模并由反应谱计算结果,分析进水塔结构在地震作用下的危险部位,通过对结构体型不断优化,得到对抗震设计和降低投资成本均有利的最优体型.研究结果对类似工程选择合理高效的塔体体型、建立相应的结构安全评价准则具有一定的参考意义.

Intake tower is the key portion of the power generation and flood discharge system,the structure performance and security relate to the normal operation of hydropower station or even the whole safety of the dam.A number of large hydropower projects are planning,designing or constructing in the meizoseismal area of Southwest China.Based on the Changheba project,the mechanical behavior and structural properties of intake towers under strong seismic excitation are researched.Through the result of response spectrum analysis of three-dimensional finite element modeling,the dangerous positions of the intake towers are analyzed.The shape of the intake towers are being optimized for both beneficial to aseismic design analysis and investment costs.The results are significant to efficient selection of the appropriate shape and setting up the evaluation criteria of structural safety.