基于谱分析法考虑高阶振型大跨越输电塔风振响应分析  

Analysis on Wind-Induced Responses of Long-Span Transmission Tower Based on Spectral Analysis Method Considering Higher Vibration Modes

作　　者：宋雪祺 邓洪洲[1] 杨子烨 赵峥 SONG Xueqi;DENG Hongzhou;YANG Ziye;ZHAO Zheng(College of Civil Engineering,Tongji University,Shanghai 200092,China;East China Power Design Institute Co.,Ltd.,Shanghai,200063,China.)

机构地区：[1]同济大学土木工程学院建筑工程系,上海200092 [2]中国电力工程顾问集团华东电力设计院有限公司,上海200063

出　　处：《结构工程师》2020年第4期90-97,共8页Structural Engineers

基　　金：国家自然科学基金(51578421)。

摘　　要：利用基于PSD(功率谱密度)输入的谱分析方法对四个典型大跨越输电塔进行了风振响应分析。通过与传统时频域分析方法分析结果的对比验证了谱分析方法的准确性,进而分析了高阶振型对大跨越输电塔位移和基底剪力的影响,结果表明如果用仅考虑一阶振型来计算特高压大跨越输电塔风振响应会带来较大误差。在此基础上,本文提出了适用于大跨越输电塔考虑高阶振型进行频谱分析的判别式,并通过六个实际工程算例验证了可靠性。新判别式操作简单,为实际工程设计提供了便利。Four typical long-span transmission towers were analyzed using spectral analysis method based on the input of power spectral density.To validate accuracy of the spectral analysis method,the results were compared with corresponding time domain and frequency domain method results.Furthermore,the influence of higher vibration modes to the displacements and base reaction forces of long-span tubular transmission towers were analyzed.The analysis indicates that it may cause error when calculating some transmission towers if only the first vibration mode is considered.This paper proposed a new discriminant formula suitable for long-span transmission towers and verified reliability of the formula using six practical engineering projects.The modified formula is easy to use and provides convenience in the practical engineering.

关 键 词：输电塔 频域法 高阶振型 判别公式 

分 类 号：TM75[电气工程—电力系统及自动化] TU311.3[建筑科学—结构工程]