斜拉桥斜拉索的风雨振动:参数研究  

WIND-RAIN-INDUCED VIBRATION OF PROTOTYPE STAY CABLE:PARAMETER STUDIES

作　　者：王凌云[1,2] 徐幼麟[2] 

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]香港理工大学土木及结构工程系

出　　处：《工程力学》2009年第7期147-154,共8页Engineering Mechanics

基　　金：香港科学研究基金项目(CERG5066/97E)

摘　　要：以往的大多数有关斜拉桥斜拉索风雨振动的研究都是在风洞内进行。虽然这些风洞/风雨洞试验展现出了在斜拉桥现场观测记录的原型斜拉索风雨振动一些重要性质,可是在原型斜拉索和圆柱体节段模型之间确实存在着某些不同。该文旨在探索原型斜拉索发生风雨振动的机理,以大量的参数分析研究系统各主要参数对原型斜拉索风雨振动的影响和作用。参数分析的结果表明:变化的气动力阻尼系数和/或水线运动、索运动以及风这三者之间相互作用所产生的激励力导致系统的风雨振动;索的结构阻尼的增加可以有效抑制索的风雨振动;索内静张力对系统的振幅有一定影响;平均风的风速剖面中的幂指数对系统的振幅也有一定影响,特别对系统发生风雨振动的相对应风速有一定影响。Most of previous studies on wind-rain-induced cable vibration were carried out in a wind tunnel. These wind tunnel or wind-rain tunnel tests do reveal some important features of wind-rain-induced vibration of prototype stay cables observed from site measurements. However, there are some differences between a rigid inclined cylinder and a prototype stay cable. This paper is aimed at exploring the mechanism of the wind-rain-induced vibration of the prototype stay cable. Extensive parametric studies are performed to investigate the effects of main parameters on the wind-rain-induced cable vibration. It is shown that the occurrence of the wind-rain-induced cable vibration is mainly because of the alternating aerodynamic damping ratio and/or the alternating excitation force due to the interaction between rivulet motion, cable motion and wind. The increase of the cable structural damping can effectively suppress the wind-rain-induced vibration of the cable. The static tension force in the cable influences the vibration response of the system moderately. The power exponent in the wind profile has some extent effects on the vibration response of the system, in particular on the critical mean wind speed.

关 键 词：风雨振动 斜拉桥 原型索 索的振动 参数研究 

分 类 号：TU973[建筑科学—结构工程]