近场地震作用下风力发电塔结构振动台试验研究  

Shaking table test for wind turbine tower structure under near⁃field ground motions

作　　者：徐亚洲[1] 孟莹 丁艳琼 Xu Yazhou;Meng Ying;Ding Yanqiong(Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学,陕西西安710055

出　　处：《土木工程学报》2024年第8期49-57,共9页China Civil Engineering Journal

基　　金：陕西省教育厅重点科学研究计划项目(20JY032)。

摘　　要：为研究近场脉冲型地震和竖向地震分量对风力发电塔结构地震响应的影响,以2MW风力发电塔结构为原型,按缩尺比为1/20进行模拟地震振动台试验。选用脉冲型地震Westmorland记录和Chi-Chi记录以及普通地震Taft记录和El-Centro记录作为输入地震动。对比分析结构的动力特性,脉冲效应对结构地震响应的影响,竖向地震分量对结构的地震响应的影响。试验结果表明:在试验过程中风力发电塔结构一直处于弹性工作状态;脉冲型近场地震动对结构的加速度响应、位移响应和应变响应具有显著的影响;竖向地震动分量对塔顶水平加速度响应和水平位移响应的影响较小,但对结构的竖向加速度和竖向位移有显著的影响。因此为提高风力发电塔结构的抗震能力,在结构设计中应更加考虑近场地震的脉冲效应和竖向地震效应的影响。To investigate the effects of near⁃field impulse⁃type and vertical seismic compo⁃nents on the seismic response of the wind power tower structure,a simulated seismic shaking table test was conducted on a 1/20 scaled model of 2MW prototype wind power tow⁃er structure.The pulsed seismic Westmorland record,the Chi⁃Chi record,the general seis⁃mic Taft record and the El⁃Centro record were selected as the input ground motion.The dy⁃namic characteristics of the structure,the effect of impulse effect on the seismic response of the structure,and the effect of vertical seismic component on the seismic response of the structure are compared and analyzed.The test results show that the wind power tower struc⁃ture keeps the elastic working condition during the test.The impulsive near⁃site vibration significantly influences the acceleration response,displacement response and strain response of the structure.The vertical seismic component has a small effect on the horizontal accelera⁃tion response and horizontal displacement response of the top of the tower,but has a signifi⁃cant effect on the vertical acceleration and vertical displacement of the structure.Therefore,in order to improve the seismic capacity of the wind power tower structure,more attention should be paid on the impulse effect of near⁃field earthquake and the effect of vertical seis⁃mic effect in the structural design。

关 键 词：风力发电塔 脉冲效应 竖向地震 地震响应 振动台试验 

分 类 号：TU352[建筑科学—结构工程]