高速客运专线轨道梁徐变变形研究进展

Study progress on creep deformation of high-speed dedicated passenger railway track girders

由于混凝土徐变的影响,高速客运专线轨道梁在长期荷载的作用下,变形随着时间不断增加,严重影响了轨道梁的使用性能,甚至危及行车安全。介绍了国内外有关混凝土徐变机理与特性的研究进展。在此基础上,对高速客运专线轨道梁徐变分析计算方法及控制措施方面的研究成果及工程经验进行了较为系统地总结;对将来高速客运专线轨道梁徐变的研究方向进行了展望。

Due to the influence of concrete creep and long - term loads, deformation of the high - speed dedicated passenger railway track girders increases with time gradually. The large deformation degenerates the serviceability seriously, and even jeopardizes the traffic safety. Study progress on mechanism and characteristics of concrete creep is introduced in the paper. Based on this, systematical summarizations of the mechanism and characteristics of concrete creep, calculated and analytical methods as well as control measures are given. In the end, research prospect in the future is made for high- speed dedicated passenger railway track girders in this paper.