主余震序列作用下风力发电塔架结构的地震损伤研究  

SEISMIC DAMAGE OF WIND TURBINE TOWER UNDER MAINSHOCKAFTERSHOCK EARTHQUAKE SEQUENCE

作　　者：李万润[1,2,3] 范科友 吴王浩 杜永峰[1,2,3] LI Wan-run;FAN Ke-you;WU Wang-hao;DU Yong-feng(Institution of Earthquake Protection and Disaster Mitigation,Lanzhou University of Technology,Lanzhou,Gansu 730050,China;International Research Base on Seismic Mitigation and Isolation of Gansu Province,Lanzhou University of Technology,Lanzhou,Gansu 730050,China;Disaster Prevention and Mitigation Engineering Research Center of Western Civil Engineering,Lanzhou University of Technology,Lanzhou,Gansu 730050,China)

机构地区：[1]兰州理工大学防震减灾研究所,甘肃兰州730050 [2]兰州理工大学甘肃省土木工程减震隔震国际科技合作基地,甘肃兰州730050 [3]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《工程力学》2024年第12期65-79,共15页Engineering Mechanics

基　　金：国家自然科学基金项目(51908266,51568041);兰州理工大学红柳杰出人才基金项目(HLLUT2022-003);甘肃省土木工程减震隔震国际科技合作基地定向开放基金项目(GII2018-N04);甘肃省土木建筑学会青年科技托举人才项目。

摘　　要：主震对于风电结构造成既定损伤后,余震的发生又会对结构造成“二次伤害”,进而使得只采用传统抗震设计方法的风电结构偏于不安全。为量化分析余震对于风电塔架结构的附加损伤,该文首先从美国太平洋地震中心选取了25条原始主余震序列,并基于重复法、随机法和衰减法来人工构造75条主余震地震动序列作为输入;其次,在建立风电塔架结构的有限元模型的基础上,提出了基于钢材疲劳累积损伤理论的余震附加损伤系数来定量描述余震引起的附加损伤,并对比分析了以上三种人工构造主余震的方法对于余震附加损伤的影响;最后,结合增量动力分析,探讨了主余震的峰值加速度及主余震峰值加速度的比值对于余震引起的附加损伤及风电塔架结构的动力响应的影响。研究结果表明:相较主震序列,余震序列的位移敏感区的分布区间更广,而加速度敏感区的分布区间更窄;采用衰减法来人工构造主余震序列最接近天然主余震序列的工况;余震附加损伤系数的变化规律依赖于主余震的峰值加速度比和具体风电塔架结构的主要能量耗散形式,其在非倒塔状态下的非主要能量耗散部分的变化不大,而在倒塔状态下的主要能量耗散部分则有激增现象。After the mainshock causes damage to the wind turbine tower,the occurrence of aftershocks may cause"secondary damage"to the tower,as a result,the wind turbine tower designed according to traditional seismic design code may be unsafe.In order to quantitatively analyze the additional damage caused by aftershocks to the wind turbine tower,firstly,25 original mainshock-aftershock earthquake sequences were selected from the Pacific Seismic Center of the United States,and artificially constructed 75 mainshockaftershock earthquake sequences using the repetition method,the random method and the attenuation method.Secondly,the finite element model of the wind turbine tower was established,and the additional damage coefficient of aftershocks was proposed based on the theory of steel fatigue cumulative damage to quantitatively analyze the additional damage caused by aftershocks.The three methods of artificially constructing mainshockaftershock earthquake sequences were compared in term of the additional damage of aftershocks.Finally,combined with the incremental dynamic analysis,the influences of the peak acceleration and the ratio of the peak acceleration of the mainshock-aftershock earthquake sequences on the additional damage caused by the aftershock and the dynamic response of the wind turbine tower were discussed.The results show that,compared with the mainshock,the aftershock earthquake sequences have a wider interval of displacement sensitive region and a narrower interval of acceleration sensitive region.The artificially constructed mainshock-aftershock earthquake sequences using the attenuation method is the closest to the natural mainshock-aftershock earthquake sequences.The additional damage coefficient of aftershocks depends on the ratio of peak acceleration of mainshockaftershock earthquake sequences and the main energy dissipation form of the wind turbine tower.The additional damage coefficient of aftershocks changes slightly at the non-main part of energy dissipating in the non-downtower state,but surges at t

关 键 词：风电塔架结构 主余震序列 疲劳累积损伤 雨流计数法 Miner理论 

分 类 号：TU352[建筑科学—结构工程] TK83[动力工程及工程热物理—流体机械及工程]