平板网架加劲梁悬索桥的自振特性分析  

Analysis of Free Vibration on Suspension Bridge on Stiffening Girder with Space Truss

作　　者：王秀丽[1] 李玉学[1] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《中南公路工程》2007年第1期37-40,共4页Central South Highway Engineering

基　　金：甘肃省建设科技攻关项目(JK-200302);兰州理工大学优秀青年教师资助计划

摘　　要：利用空间网架结构刚度大而悬索结构刚度较低的特点,提出了采用网架结构代替常规悬索桥的加劲梁,构成平板网架加劲梁悬索桥。探讨了相应结构的受力特征,并以108国道陕西和山西交界的禹门口黄河公路120 m的悬索桥为背景,建立了整体结构的分析模型,利用ANSYS有限元软件对该结构体系进行自振特性的分析计算,得到了该桥型的横向、竖向、纵向、扭转以及耦合振动的频率和振型。分析结果表明,由于索、杆和空间网架结构的共同工作效应,使得这种体系的整体刚度好,抵抗变形能力强,动力性能优越。同时分析结果必将会为这种新型桥梁进一步的抗风、抗震等动力分析提供有益的参考。In this paper,space truss structure replace the stiffening girder of conventional suspension bridge is developed according to space grid structure have good stiffness and the suspended-cable structure more soft. The analysis of free vibration performance has been carried out on this kind of structure by finite element method. The commercial software ANSYS has been used. The analysis model based on the YU gate Yellow River suspension bridge with a span of 120 m on national road 108 has been established. The natural frequency and modes are acquired. Because of the cable, the pole and space grid structure working together harmonic, this type of structure have good characteristics, such as rigid of the whole structure, ability of resisting deformation, dynamic performance etc. The conclusions show that application of space grid structure into suspension bridge is feasible. In addition, the result of analysis will give some useful reference for resisting wind and seismic study.

关 键 词：平板网架 加劲梁 悬索桥 有限元分析 自振特性 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]