摘要
钢-混凝土组合桁架是一种新型桥梁结构.基于桥梁良好的整体受力性能和较低的施工、养护成本,西平铁路线上三处立交方案采用了跨度80 m,桁高11 m的新型钢-混组合铁路桁架桥.介绍了该类型桥梁基本组成及构造特点.基于空间杆系有限元理论,建立了该类型桥梁整体分析的力学模型,研究了12种典型荷载组合下桥梁的变形和应力特征,并进行了桥梁自振特性的分析.通过和设计规范的对比说明,桥梁力学指标满足使用要求.
Steel-concrete composite truss bridge is a new type bridge.Considering whole integral forced performance and less construction and maintenance expense,three steel-concrete composite truss bridges are designed for Xiping railway viaduct.The bridge＇s span is 80 m,and the total height of truss is near 11m.In this paper,this new type of bridge＇s composition and construction features are introduced.Based on skeletal finite element method,the whole structural model is built.Under 12 load combination,the whole structural displacement and members＇ stresses are calculated and analyzed.Using structural model,the vibration characteristic of the composite truss is calculated.Compared with design code,the bridge＇s mechanical indexes can meet the needs for railway and high-speed railway bridge.
出处
《兰州交通大学学报》
CAS
2010年第6期31-34,共4页
Journal of Lanzhou Jiaotong University
基金
铁道部科技研究开发计划项目(2009G003-G)
关键词
铁路桥
钢-混组合桁架
力学性能
有限元法
railway bridge
composite steel and concrete truss
mechanical performance
finite element method
