索端激励对斜拉索风-雨致振动性能的影响  

EFFECTS OF EXCITATION AT CABLE ENDS ON RAIN-WIND-INDUCED VIBRATION OF STAYED CABLES

作　　者：李永乐[1] 向活跃[1] 何向东[1] 廖海黎[1] 

机构地区：[1]西南交通大学桥梁工程系,四川成都610031

出　　处：《工程力学》2012年第10期218-224,231,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(50778155);教育部新世纪优秀人才支持计划项目(NCET-06-0802);四川省杰出青年学科带头人计划项目(2009-15-406)

摘　　要：实际斜拉索的振动可能是风-雨致振动和参数振动的组合,索端激励对斜拉索风-雨致振动性能有一定影响。将索端激励转化为作用在斜拉索上的弹性力和惯性力,建立了斜拉索风-雨致振动和参数振动的组合分析模型,在讨论了参数振动模型和斜拉索风-雨致振动的特性后,探讨了索端激励对风-雨致振动振幅、水路运动以及达到最大振幅所需时间的影响。结果表明:在一定的频率范围内,索端激励的存在会改变斜拉索风-雨致振动幅值和水路运动幅值随时间变化的特性,并能促进斜拉索风-雨致振动的发生。The vibration of actual cables may be the combination of a wind-rain-induced vibration（WRIV） and a parametric vibration.The excitation at cable ends can change the characteristics of WRIV of stayed cables.Considered the effects of an excitation at cable ends,an integrated analytical model including a WRIV and a parametric vibration is developed.In this model,the excitations are transformed into an elastic force and an inertia force which are acted on cable firstly.Then the characteristics of the parametric vibration model and WRIV model are analyzed.And the amplitude,rivulet of motion and the time arrived largest amplitude are investigated to demonstrate the effects of the excitation at cable ends.It shows that the excitation within a range of frequencies at cable ends change the amplitude of WRIV and the time-changing characteristics of rivulet motion,and promote the occurrence of a WRIV.

关 键 词：风-雨致振动 索端激励 斜拉索 参数振动 联合振动 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]