非标准圆斜拉索风致振动时频特征研究  

STUDY ON TIME-FREQUENCY CHARACTERISTICS OF WINDINDUCED VIBRATION OF NON-STANDARD CIRCULAR STAYED CABLES

作　　者：孙一飞 刘庆宽 李震[1] 郑云飞 贾娅娅 张卓杰 SUN Yi-fei;LIU Qing-kuan;LI Zhen;ZHENG Yun-fei;JIA Ya-ya;ZHANG Zhuo-jie(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043 China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China;Shijiazhuang Institute of Railway Technology,Shijiazhuang 050041,China)

机构地区：[1]石家庄铁道大学土木工程学院,石家庄050043 [2]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,石家庄050043 [3]河北省风工程和风能利用工程技术创新中心,石家庄050043 [4]石家庄铁路职业技术学院,石家庄050041

出　　处：《工程力学》2021年第S01期52-57,共6页Engineering Mechanics

基　　金：国家自然科学基金面上项目(51778381);河北省自然科学基金重点项目(E2018210044);河北省高端人才项目(冀办[2019]63号);河北省博士研究生创新资助项目(CXZZBS2021118)。

摘　　要：明确斜拉索的气动特性对于保证桥梁的安全性和经济性具有重要意义,服役期的斜拉索在各种作用下,截面可能由标准圆变为非标准圆,因此,有必要对非标准圆斜拉索的风致振动特性进行研究。以长短轴之比分别为1.05、1.10、1.15的椭圆柱体模型为研究对象,利用风洞测振试验,研究非标准圆斜拉索的风致振动时频特征。结果表明:非标准圆斜拉索风致振动时程整体上可以分为两类,一类是类似于简谐运动的非常稳定的周期性运动,另一类则随时间变化不特别稳定,一段时间内振幅较小,另一时间段内振幅则较大;在绝大多数工况下,风致振动为第一类振动,振幅较大且非常稳定;模型的振动频率基本上在自振频率附近波动,当模型出现大幅振动时,振动频率开始偏离自振频率,这是因为大幅风致振动可能使得模型系统产生了气动负刚度或气动质量,进而使得振动频率降低。It is of great significance to obtain the aerodynamics of stay cables to improve the safety and economy of bridges.However,under various effects,the cross-sections of stay cables during service might tend to be non-standard circle.It is necessary to investigate the wind-induced vibration characteristics of the non-standard circular stay cables.Three elliptical cylinders were used,with major-minor ratios of 1.05,1.10 and 1.15,to investigate the time-frequency characteristics of vibration of non-standard circular stay cables.The results show that the time histories of the observed vibrations could be classified into two categories.One is a very stable periodic motion,which is similar to the simple harmonic motion.While the other is not particularly stable,with small amplitude in one period and large amplitude in another period.In most test cases,wind-induced vibration lies in the first category of vibration,more stable and with larger amplitude.The vibration frequency of the model is generally around the natural frequency.When the vibration is violent,the vibration frequency begins to deviate from the natural frequency.The cause might be the additional negative aerodynamic stiffness or mass induced by the large-amplitude vibration.

关 键 词：桥梁工程 桥梁风工程 风洞试验 风致振动 时频特征 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]