大跨度悬索桥动力特性的参数分析  

Parameter analysis of long span suspension bridge dynamic characteristics

作　　者：肖勇刚[1] 陈伟华[1] 

机构地区：[1]长沙理工大学土木与建筑学院,湖南长沙410004

出　　处：《长沙理工大学学报（自然科学版）》2016年第1期28-33,共6页Journal of Changsha University of Science and Technology:Natural Science

基　　金：国家自然科学基金资助项目(51108047)

摘　　要：以单跨悬索桥为研究背景,运用大型有限元软件MIDAS Civil 2013建立该桥空间模型,采用子空间迭代法,研究了恒载集度、中央扣和结构刚度等参数的变化对悬索桥成桥状态动力特性的影响。研究结果表明,增加恒载集度能降低主缆振动频率,但对其他振型频率的影响比较复杂;中央扣能增强全桥的整体刚度;主梁刚度的改变对竖弯、侧弯影响较大;主塔与吊杆刚度的变化对结构的自振频率影响不明显。Based on single span suspension bridge,this paper uses large-scale finite element software MIDAS Civil 2013 to establish the bridge space model,the subspace iteration method is adopted to study the dead load degree,the central buckle and the change of the stiffness parameters such as impact on the dynamic characteristics of the suspension bridge into the bridge state,the results suggest that increased degree of dead load set can reduce the vibration frequency of main cable but the impact on the rest of the modal frequency is more complex.The central buckle can enhance the whole stiffness of the whole bridge;the girder stiffness change influence laterally and rertically.The change of the main tower and boom stiffness is not obvious influence on structure of the natural frequency of vibration.

关 键 词：单跨悬索桥 动力特性 结构参数 振型 频率 有限元法 

分 类 号：U443.38[建筑科学—桥梁与隧道工程]