斜拉索风雨激振非线性分析  

Nonlinear analysis of rain-wind-induced vibration of stay cables

作　　者：李暾[1] 严宁[1] 

机构地区：[1]广西科技大学土木建筑工程学院,广西柳州545006

出　　处：《广西科技大学学报》2017年第1期1-5,共5页Journal of Guangxi University of Science and Technology

基　　金：国家自然科学基金(51368008);广西科技大学创新团队(2015年)资助

摘　　要：对包括粘滞线性阻尼力和库伦阻尼力的运动水线节段拉索风雨激振理论模型进行数值求解,对拉索风雨激振进行了非线性分析,得到了拉索和水线的运动相图;研究了风速、风偏角、拉索阻尼比和库伦阻尼力对拉索振幅的影响.研究表明:拉索风雨激振对风速、风偏角和库伦阻尼力非常敏感,表现出明显的非线性特征;在一定风速下,拉索阻尼比的增长会抑制拉索振幅;水线运动形式复杂,与准运动水线假设有较大差别.The model of rain-wind-induced vibration of segmental cable with moving rivulet was solved by numerical approach. The nonlinear analysis of rain-wind-induced vibration of stay cables was conducted. The phase diagrams of the cable and rivulet were obtained. The influence of wind velocity, wind yaw angle, damping ratio and Coulomb damping force on vibration amplitudes of cable was investigated. Study results show that the rain-wind-induced vibrations were sensitive to wind velocity, wind yaw angle and Coulomb damping force; the increase of the damping ratio could suppress the vibration amplitude of cable for some specific wind velocity; the movement of rivulet was complex, and it was quite different to quasi moving rivulet hypothesis.

关 键 词：风雨激振 节段拉索模型 耦合振动 非线性 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]