输电塔风致响应的时频域计算方法和比较  

Time and frequency domain calculation methods of wind-induced responses of transmission tower and their comparison

作　　者：沈国辉[1] 黄俏俏[1] 邢月龙[2] 郭勇[2] 

机构地区：[1]浙江大学土木工程学系,浙江杭州310058 [2]浙江省电力设计院,浙江杭州310007

出　　处：《华中科技大学学报（自然科学版）》2013年第3期128-132,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51178425);浙江省电力公司科技项目(ZDK025-2011;ZDK088-2011)

摘　　要：针对输电塔顺风向风致响应的各种时频域计算方法的适用性问题,以两个典型输电塔为例比较各种方法获得的结果,探讨输电塔的响应特征和各种方法的适用性,为输电塔顺风向风致响应的计算提供参考.研究表明:时频方法和频域的两种方法(完全二项式(CQC)法和背景加共振法)得到的结果非常接近,说明这些方法均适用于求解输电塔结构的风致响应;在频域分析中,模态交叉项的贡献不可忽略;对于较柔的输电塔,只考虑第1阶主参模态会产生较大的误差,须要考虑多阶模态的参与.Different time domain methods and frequency domain methods were employed to obtain wind-induced responses of transmission towers in this study. The characteristics of responses and the applicability of these methods based on two typical transmission towers were investigated. Then the references to obtain wind-induced along wind response of transmission tower were suggested. Results show that the results based on time domain method and two frequency domain methods, i. e. , complete quadratic combination （CQC） method and the combination of background and resonant responses method, are very close, indicating that these methods are all suitable to obtain wind-induced alongwind responses of transmission tower. The contribution of cross part of modes cannot be ignored in the frequency domain analysis. The large discrepancy will be introduced if only the first dominated mode is considered, which is especially significant for some flexible transmission towers, and higher vibrating modes should be considered in the frequency domain analysis.

关 键 词：风致响应 输电塔 时域法 频域法 背景响应 

分 类 号：TU312.1[建筑科学—结构工程]