基于健康监测数据的平行钢绞线斜拉索风致振动分析  

作　　者：李良才 

机构地区：[1]安徽省铜陵市长江公路大桥管理处,安徽铜陵244000

出　　处：《科技创新与应用》2023年第24期117-120,共4页Technology Innovation and Application

摘　　要：平行钢绞线斜拉索由于其施工便捷、易于维护的特点,在国内外斜拉桥上得到大规模应用。钢绞线斜拉索受风荷载及多因素影响,可能会出现多形态振动。以某跨江大桥为研究对象,基于健康监测系统,关注平行钢绞线斜拉索振动特征,通过时频分析方法,获取斜拉索振动频率分布及其在时间上变化,结合特殊事例,开展斜拉索振动与风速风向、主梁振动的相关性分析,研究平行钢绞线斜拉索风致振动成因。结果表明,平行钢绞线斜拉索日常运营过程中,在低频范围内呈现明显的倍频效应;在降温、雨雪天气下,受特定风速、风攻角影响,钢绞线斜拉索将出现1阶为主的大幅振动,且塔-索-梁之间出现耦合振动,斜拉索出现共振/参数振动。Because of its convenient construction and easy maintenance,parallel steel strand stay cables have been widely used in cable-stayed bridges at home and abroad.Under the influence of wind load and many factors,the stay cable of steel strand may appear multi-form vibration.Taking a river-crossing bridge as the research object,based on the health monitoring system,the vibration characteristics of parallel steel strand stay cables are paid attention to.The vibration frequency distribution and time variation of stay cables are obtained by time-frequency analysis method.Based on special cases,the correlation analysis of stay cable vibration,wind speed,wind direction and main beam vibration is carried out,and the causes of wind-induced vibration of parallel steel strand stay cables are studied.The results show that during the daily operation of parallel steel strand stay cables,there is an obvious frequency doubling effect in the low frequency range,and under the influence of specific wind speed and wind angle of attack under the weather of cooling,rain and snow,the steel strand stay cables will have the first-order large vibration,and there will be coupling vibration between tower-cable-beam and resonance/parametric vibration of stay cables.

关 键 词：斜拉索 平行钢绞线 风致振动 覆冰驰振 参数振动 

分 类 号：U443[建筑科学—桥梁与隧道工程]