水电站地面厂房抗震措施研究

Aseismic measure of surface hydropower house

为研究对厂房结构抗震合理适用的抗震措施,选取某实际厂房结构,建立三维有限元模型,借助ABAQUS有限元软件,采用时程分析法进行结构动力计算。调整Koyna水平地震波和某人工地震波加速度峰值为0.246 g作为地震荷载。结果表明对于尾水平台较高且主副厂房之间无分缝的水电站厂房,不宜将屋面板和桁架与排架柱铰接,屋顶简支对上下游排架和上下游墙的抗震更为有利;在水电站地面厂房中设置黏滞阻尼器是有效的抗震措施,可以增强上游排架和上游墙以及下游排架的抗震能力,但应重点考虑阻尼器支撑高度。

A three-dimensional finite clement model of actual hydropower house structure was developed to study its effective aseismic measure. Dynamic structural analysis was made with an ABAQUS software and time-historical analytical method, by using seismic loads of Koyna earthquake transverse ground acceleration and artifical earthquake ground acceleration whose peak values were adjusted to 0. 246g. The results show that if there is no joint between the main powerhouse structure and its service area of high draft tube deck, a freely- supported roof slab is advantageous in earthquake-resistance capacity of framed bent and powerhouse wall in comparison with a hinged support type. In this case, installation of viscous dashpots in the house is an effective aseismic measure in enhancing the earthquake-resistance capacity of framed bent and powerhouse wall, and the support height of the dashpots is a crucial factor.