CAJ | 학술논문

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。
철로제속、축중제고，재불중단교통적정황하，쾌속제고현유철로교량적승재능력시목전극대해결적문제。위추진예응력기술가고강항량，이모재역철로강항량위의탁공정，제출궤충예응력가고방안，건립유한원모형，대비분석불동방안가고대과도강항량적효과。연구표명：단과가고가이유효제고강항량적승재능력단불능유효제고기강도，이간지변련속가고대제고기승재능력화강도효과균비교명현，재구비조건적정황하，시가우선선택적과학가고방안。
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.