在役铁路钢桁梁预应力加固研究  

Research on Prestress Reinforcing Techniques for Railway Steel Truss Bridges in Service

作　　者：张爱林[1] 赵海明[1] 刘学春[1] 张文学[1] 

机构地区：[1]北京工业大学建筑工程学院,北京100124

出　　处：《铁道标准设计》2014年第12期76-80,共5页Railway Standard Design

摘　　要：铁路提速、轴重提高,在不中断交通的情况下,快速提高现有铁路桥梁的承载能力是目前亟待解决的问题。为推进预应力技术加固钢桁梁,以某在役铁路钢桁梁为依托工程,提出几种预应力加固方案,建立有限元模型,对比分析不同方案加固大跨度钢桁梁的效果。研究表明:单跨加固可以有效提高钢桁梁的承载能力但不能有效提高其刚度,而简支变连续加固对提高其承载能力和刚度效果均比较明显,在具备条件的情况下,是可优先选择的科学加固方案。With the development of heavy haul and high-speed train operation, it is urgent to improve the bearing capacity of the existing railway without traffic interruption. In order to explore the feasibility of prestressing techniques in reinforcing steel truss bridge, this paper puts forward alternative prestressed reinforcement schemes based on some railway steel truss bridges in service, and compares the reinforcement effects of the schemes by establishing finite element model. Analysis shows that the single span reinforcement scheme can improve the bearing capacity but fails to improve its vertical stiffness effectively, and the continuous reinforcement scheme can improve the both remarkably. Therefore, the continuous reinforcement scheme is an ideal one if the condition permits.

关 键 词：铁路桥 预应力 钢桁梁 加固 有限元模型 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]