白鹤滩水电站升船机塔柱结构抗震性能分析

Seismic performance of large vertical ship-lift tower of Baihetan Hydropower Station

采用ABAQUS有限元软件建立了白鹤滩水电站升船机塔柱结构有限元模型,研究塔柱结构在地震荷载作用下的位移、加速度和应力响应。计算结果表明:在单独水平地震作用以及水平、竖向地震共同作用下,塔柱顶部的水平位移最大值分别为30.59 cm和31.84 cm,均小于水平位移限值,满足规范要求。为研究塔柱结构的P-Δ效应影响,对水平和竖向地震作用下的塔柱结构进行考虑非线性的动力时程分析。结果表明:考虑P-Δ效应后,结构的动力响应总体呈现放大效果,位移最大值、加速度最大值和应力最大值增幅在10%左右,说明P-Δ效应会在一定程度上削弱结构的抗震性能,因此在此类高耸结构的抗震性能研究中,P-Δ效应的影响不可忽略。

In order to study the displacement,acceleration and stress response of tower structures under seismic loads,the finite element model of tower structure of the ship lift of Baihetan Hydropower Station was established by using ABAQUS finite element software.The results show that the maximum horizontal displacement of the top of the tower is 30.59 cm under single horizontal earthquakes,and that is 31.84 cm under combination of horizontal and vertical earthquakes,which were under the requirement of the standard.In order to study the influence of P-Δeffect on the column structure,we conducted a dynamic time history analysis on the column structure under horizontal and vertical earthquakes,considering geometrical nonlinearuty.The results show that after considering the P-Δeffect,the dynamic response of the structure is generally magnified,the maximum displacement,maximum acceleration and maximum stress increasing by about 10%,indicating that the P-Δeffect will weaken the seismic performance of the structure to a certain extent.Therefore,in the seismic performance study of tower structure,the P-Δeffect can not be ignored.