地震作用下超高扬程升船机塔柱结构的鞭梢效应

以金沙江下游白鹤滩水电站拟建升船机工程为例,运用大型有限元分析软件ABAQUS建立包括顶部机房在内的超高扬程升船机塔柱结构模型,采用动力时程法分析了地震作用下塔柱顶部机房的鞭梢效应,并探讨了机房结构布置型式对鞭梢效应的影响。结果表明,塔柱结构前10阶振型以横河向振动、扭转振动和顺河向振动为主;地震作用下顶部机房的动力响应远大于主体塔柱结构;机房的结构布置型式对鞭梢效应影响较大;当主体塔柱和顶部机房结构的刚度和质量差异过大时,顶部机房的鞭梢效应对主体塔柱动力响应的影响较小。

Whipping Effect of Large Vertical Ship-Lift Tower Structure under Seismic Action

Taking the project of Baihetan ship-lift in the lower reaches of the Jinsha river for an example, large-scale finite element analysis software ABAQUS was used to establish the large vertical ship-lift tower structure model which includes the top machine room. The dynamic time history method was adopted to analyze the whipping effect of the ship-lift tower under seismic action and discuss the impact of structure style of the top machine room on the whipping effect. The results show that the first ten-order modes of the tower structure are mainly transverse, torsional and longitudinal vibration. The dynamic response of the top machine room is much larger than that of the main tower structure under seismic action. The structure style of the top machine room has a great influence on the whipping effect. When the difference in stiffness and quality between the main tower structure and the top machine room is too large, the whipping effect of the top machine room has little impact on the dynamic response of the main tower structure.