桅杆结构风振系数研究  

Wind-vibration coefficient of guyed masts

作　　者：邓洪洲[1] 徐海江[1] 马星 

机构地区：[1]同济大学建筑工程系,上海200092 [2]南澳大利亚大学自然与建筑环境系

出　　处：《振动与冲击》2016年第22期48-53,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金项目资助(51578421)

摘　　要：基于随机风振理论,推导了桅杆结构杆身和纤绳风振系数计算公式;结合高耸结构设计规范的修订,分析了原规范杆身风振系数计算公式存在的问题;基于新荷载规范的改动,给出了杆身风振系数计算方法,更新了纤绳风振系数计算参数表格;通过算例分析发现,杆身振型可按无风状态计算且计算杆身风振系数时可只考虑前四阶振型的贡献;时程分析结果表明,杆身各段取四点计算风振系数的方法精度较好,计算简便;由于新荷载规范提高了脉动风荷载的峰值因子和湍流度,纤绳风振系数增大约20%。The calculation formulae for the wind vibration coefficients of masts and cables were deduced on the basis of random vibration theory.The inadequacy about the wind vibration coefficient in the design code of high-rising structures together with the resision of the code were discussed.A new formula was proposed and the parameter＇s table was re-established on the basis of the revision of load code for designing building structures.The analysis of examples shows that the modes of masts can be calculated under the assumed condition of no-wind state and the first four modes need to be taken into account.The time-domain analysis results prove that the method of using four points in each section is precise enough and convenient to use.Due to the increase of the peak factor and turbulence intensity in the new code,the wind vibration coefficient of cables increases by approximately twenty percent.

关 键 词：桅杆结构 风振系数 纤绳 高耸结构 设计规范 

分 类 号：TU392.6[建筑科学—结构工程] TU311.3