大跨径自锚式悬索桥成桥状态动力特性参数分析  

Parametric Analysis of Dynamic Performance of Completion State of Long Span Self-Anchored Suspension Bridge

作　　者：康俊涛[1] 袁敏[1] 王同民[2] 

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070 [2]中铁大桥局集团第一工程有限公司,河南郑州450054

出　　处：《桥梁建设》2013年第6期64-70,共7页Bridge Construction

基　　金：国家自然科学基金项目(51278393)~~

摘　　要：为研究大跨径自锚式悬索桥结构参数对成桥状态下桥梁动力特性的影响,以桃花峪黄河大桥主桥为工程背景,基于MIDAS Civil 2012平台建立全桥空间有限元模型,采用子空间迭代法进行动力计算,分析了垂跨比、恒载集度和结构刚度等参数的变化对该桥成桥状态动力特性的影响。结果表明:桥梁振型较合理,频谱分布密集;垂跨比对结构竖弯振型频率影响较大;恒载集度对结构各阶振型频率影响明显;主缆抗拉刚度主要影响加劲梁的竖弯、扭转振型频率;吊索抗拉刚度对结构的各阶振型频率影响很小;加劲梁抗弯刚度对结构的竖向、侧向、扭转振型频率影响显著;桥塔的纵向抗弯刚度主要影响结构的纵飘振型。To study the influences of the structural parameters of long span self-anchored sus- pension bridge on the dynamic performance of the completion state of the bridge, the main bridge of Taohuayu Huanghe River Bridge was cited as an example and a spatial finite element model for the whole bridge of the example bridge was established on the platform of the software MIDAS Civil 2012. The subspace iteration method was used to carry out the dynamic calculation and the influences of the parametric changes of the sag-to-span ratios, dead load intensity and structural stiffness on the dynamic performance of the completion state of the bridge were analyzed. The re- sults of the calculation and analysis demonstrate that the bridge has the rational vibration modes and dense frequency spectrum distribution. The influence of the sag-to-span ratios on the vertical bending vibration mode and frequency of the structure is great. The influence of the dead load in- tensity on the vibration modes and frequencies of the different orders of the structure is signifi- cant. The main cable tensile stiffness mainly has influence on the vertical bending and torsional vibration modes and frequencies of the stiffening girder. The influence of the hanger tensile stiff- ness on the vibration modes and frequencies of the different orders of the structure is very little. The influence of the bending stiffness of the stiffening girder on the vertical, lateral and torsional vibration modes and frequencies is significant. The tower longitudinal bending stiffness mainly has influence on the longitudinal fluctuation vibration mode of the structure.

关 键 词：自锚式悬索桥 成桥状态 有限元法 动力分析 垂跨比 恒载集度 结构刚度 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]