宜昌长江铁路大桥动力特性分析  

Analysis of Dynamic Characteristics of the Yichang Yangtze River Railway Bridge

作　　者：吴再新[1] 贺国京[1] 罗世东[2] 严爱国[2] 

机构地区：[1]中南大学土木建筑工程学院,湖南长沙410075 [2]铁道第四勘察设计院桥路处,湖北武汉430063

出　　处：《铁道学报》2004年第4期104-108,共5页Journal of the China Railway Society

基　　金：铁道部科技发展项目(2003G035)

摘　　要：在总结以往动力分析模型的基础上,以三维实体元、梁及杆元对设计中的宜昌长江铁路大桥进行了全桥三维有限元建模,并以弹簧单元计入了桩 土共同作用。通过比较不同建模方法对动力分析的影响,深入分析了宜昌长江铁路大桥的动力特性,研究了二期恒载对结构动力特性的影响。分析成果表明,大跨度桥梁结构动力分析必须建立尽可能详尽的分析模型,以反映结构的实际受力特点。In this paper, based on the previous dynamic analysis models, a new 3D FEM model is built up for the under-design Yichang Yangtze River Railway Bridge , which includes solid elements, beams and link elements and takes into account the pile-soil interaction as elastic elements. In comparision with other modeling methods for dynamic analysis, this paper goes into details in tespect of the dynamic characteristics of the Yichang Yangtze River Railway Bridge and the effect of the later applied dead load on the dynamic structural characteristics. The analytic results show that long-span briges should be modeled as precisely as possible to reflect their mechanical characteristics.

关 键 词：刚构 钢管拱 建模 铁路 动力分析 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]