拉索表面材料对风雨激振的影响研究  

THE INFLUENCE OF SURFACE MATERIAL OF CABLE ON RAIN-WIND INDUCED VIBRATION

作　　者：李暾[1,2] 陈政清[1] 李寿英[1] 

机构地区：[1]湖南大学风工程试验研究中心,湖南长沙410082 [2]广西工学院土木建筑工程系,广西柳州545006

出　　处：《工程力学》2009年第7期47-53,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(50708035);国家科技支撑计划项目(2006BAJ03B04-2);中国博士后科学基金项目(20060400873)

摘　　要：利用浸润学及普朗特边界层理论,提出拉索表面与水线之间作用力包括库仑阻尼力和粘性阻尼力。拉索表面材料对水浸润性的强弱影响着库仑阻尼力的大小,进而影响着拉索的风雨激振。根据研究成果,建立水线运动与拉索振动耦合的拉索风雨激振运动微分方程,并运用龙格-库塔法对运动微分方程进行求解。计算结果表明:不同的拉索表面材料对风雨激振有较大影响,斜拉索风雨激振中拉索的振幅随着库仑阻尼力的增大而增大,选用疏水性好的表面材料能够有效的减小风雨激振时拉索的振幅。According to the soakage theory and Prandtl boundary layer theory, the interactive force model between the cable surface and the rivulet is proposed for analyzing the rain-wind-induced vibration of stay cables. In addition to the well-known viscous damping force, the proposed force model includes the Coulomb damping force which accounts for the effect of water soakage on materials of cable surface. Equations of motion of the coupled cable-rivulet system are formulated and are solved with the commonly-used Runge-Kutta method. It is shown that the vibration amplitude of stay cables increases with the increasing Coulomb damping force. It is thus concluded that the cable surface materials have an important effect on cable vibration and the use of surface materials with good hydrophobic performance reduces the vibration amplitude of stay cables.

关 键 词：斜拉索 水线 风雨激振 库仑阻尼力 粘性阻尼力接触角 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]