抑制斜拉桥拉索风雨激振的气动措施研究  

A STUDY ON AERODYNAMIC CONTROL COUNTERMEASURES TO RAIN-WIND INDUCED VIBRATION OF CABLES IN CABLE-STAYED BRIDGE

作　　者：李文勃[1] 林志兴[1] 

机构地区：[1]同济大学

出　　处：《土木工程学报》2005年第5期48-53,共6页China Civil Engineering Journal

基　　金：国家自然科学基金重大项目(59895410);上海市科委科技发展基金(036511002)

摘　　要：在驰振理论的基础上,运用带有运动水线的二维拉索模型对风雨激振进行理论分析,得到了拉索发生风雨激振的充分条件、必要条件及临界发散风速。并将此分析方法运用到设有气动措施的拉索上,引入等效阻尼比指标对气动措施减振效果进行定量分析。结合静气动三分力试验和分析计算,对螺旋线、纵向肋条和椭圆环三种气动措施的减振效果进行评价分析,螺旋线、纵向肋条的减振效果好于椭圆环。通过人工降雨试验,对气动措施减振效果的分析方法进行检验。Based on galloping theory,a theoretical analysis of rain-wind induced vibration is carried out by using a two-dimension mechanical model with movable rivulet,to obtain the sufficient condition, the necessar y condition and the critical wind speed of rain-wind induced vibration.With the same method,equivalent damping ratio is introdu ced to quantitantirely evaluate the effect of aerodynamic countermeasures to mitigate rain-wind induced vibration, and the eq uivalent damping ratios of helical wire cable, axially protuberated cable, elliptical discrete thick plates cable are calc ulated.Finally, the rain-wind induced vibration wind tunnel tests are conducted to verify the method.

关 键 词：斜拉桥 斜拉索 风雨激振 气动措施 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]