准高速客运专线轨道梁的徐变性能  

Creep Behavior of Track Girders on Quasi-high-speed Dedicated Passenger Railway

作　　者：薛伟辰[1] 王巍[1] 任廷柱[2] 胡于明[1] 

机构地区：[1]同济大学土木工程学院,上海200092 [2]上海市政工程设计研究总院,上海200092

出　　处：《西南交通大学学报》2008年第4期434-440,共7页Journal of Southwest Jiaotong University

基　　金：建设部研究开发项目(04-2-026);上海市青年科技启明星(跟踪)计划资助项目(06QH14013)

摘　　要：以秦沈客运专线轨道梁为原型,设计了3根1∶5大尺度T型预应力混凝土模型梁,进行了为期3 a的徐变性能试验,重点考察了混凝土种类和预应力筋张拉方式对轨道梁徐变变形的影响.编制了基于龄期调整有效模量法的时随有限元全过程分析程序,实现了准高速客运专线轨道梁时随全过程分析.在此基础上,提出了综合考虑混凝土种类、预应力筋张拉方式及截面上下缘应力差等因素影响的准高速客运专线预应力混凝土轨道梁徐变变形的设计建议,计算结果与试验值吻合较好.By taking track girders on Qinhuangdao-Shenyang quasi-high-speed dedicated passenger railway as prototypes, an experiment for about 3 a was conducted on three prestressed concrete model beams with a geometrical simulation ratio of 1 to 5 to probe into their creep behaviors. The research emphasizes the effects of types of concrete and tensioning methods of prestressed steel bar on creep deformation. Based on the age-adjusted effective modulus method （AEMM）, a time-dependent finite element analysis program was developed, as a result, the time-dependent full-range analysis of the creep deformation of track girders can be made. A design suggestion was given to the creep deformation of track girders on a quasi-high-speed dedicated passenger railway by taking the types of concrete, the tensioning methods of prestressed steel bar and the difference between stresses in upper and lower fibers into account. The calculated results based on the suggestion agree well with the experimental data.

关 键 词：准高速客运专线 轨道梁 徐变性能 试验 时随分析 设计建议 

分 类 号：TU378.2[建筑科学—结构工程]