九江长江公路大桥斜拉索振动特性研究  

Study of Vibration Property of Stay Cables of Jiujiang Changjiang River Highway Bridge

作　　者：张武剑 王波[2] 杨金保 柴小鹏[2] 

机构地区：[1]江西省高速公路投资集团有限责任公司,江西南昌330025 [2]中铁大桥局集团桥科院有限公司,湖北武汉430034 [3]江西省交通设计院,江西南昌330002

出　　处：《世界桥梁》2012年第6期47-51,共5页World Bridges

基　　金：江西省交通运输厅科技项目(2010C00005)

摘　　要：为研究斜拉索在主梁振动形成的端部位移激励下的振动特性,在斜拉索面内振动、理想索、垂度为抛物线和满足Hook定理的假设下,建立了考虑主梁端部激励的斜拉索非线性振动控制方程,阐明了端部位移激励引起斜拉索大幅横向振动的机理。利用动力有限元方法计算九江长江公路大桥的动力特性,根据频率匹配关系,初步确定可能发生大幅振动的斜拉索。利用推导的振动控制方程,对可能发生大幅振动的斜拉索进行数值积分分析,得到了各斜拉索内共振和参数共振的共振区,发现足够的斜拉索阻尼比可以避免斜拉索产生大幅振动。In order to study the vibration property of stay cables under the action of end dis- placement caused by the main girder oscillation, the nonlinear vibration control equation of the stay cables taking into consideration of the end excitation of the main girder was established, sup- posing that the in-plane vibration of the stay cables, ideal stay cables and the amount of the deflection tracking a parabola and meeting the Hook theorem, the mechanism of large-amplitude lateral vibration of the stay cables excitated by end displacement was also elucidated. The dynam- ic finite element method was used to simulate the dynamic behavior of the Jiujiang Changjiang River Highway Bridge, and the stay cable which was prone to vibrate excessively was initially identified according to the frequency matching relations. In the mean time, the vibration control equation derived was used to carry out numerical integration analysis for the stay cables conducive to large-amplitude vibration, so as to find the resonance region of the inner resonant vibration and parameter resonant vibration of each stay cable. The results of the analysis show that enough damping ratio of stay cables can prevent the occuring of violent vibration of stay cables.

关 键 词：斜拉索 端部位移激励 振动特性 阻尼比 理论分析 有限元法 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]