铁道标准设计Issue(6)：65-67,72,4.
高速铁路混凝土桥梁徐变变形计算分析及控制措施研究
Research on Calculation Method and Control Measure of Creep Deformation of Concrete Bridge on High-speed Railway
周东卫1
作者信息
- 1. 中铁第一勘察设计院集团有限公司,西安710043
- 折叠
摘要
Abstract
Creep deformation in later period of pre-stressed concrete will cause hogging and sagging of a bridge,then cause irregularity of the track.To solve this problem,after analyzing and researching the effect on the regularity property of ballastless track caused by the later-period creep,a new computational method was proposed in which the theoretic creep deformation should be assisted by a correction coefficients ; also a new control measure was put forward:when calculating the constructed cross-section points,a vertical displacement should be reserved in advance to offset the creep effect.Meanwhile,a research on this correction coefficient was carried out at three girder-prefabrication yards on Beijing-Shanghai High-speed Railway.The results show that,by the time of 60 ～ 180 d after girder's final tension,at some time point the correction coefficient of straight precast girder of 32.6 m in length is only 0.5,and the maximum difference of creep deformation is up to 4.6 mm before and after the correction.Finally,the author comes to the conclusion that,the theoretical creep deformation with this correction coefficient can be closer to the actual creep deformation than that of without this correction coefficient; and the influence on the regularity property of ballastless track caused by later-period creep of concrete can be weakened effectively by reserving the vertical displacement in advance when calculating every cross-section point of every construction stage.关键词
高速铁路/无砟轨道/混凝土桥梁/徐变/修正系数Key words
high-speed railway/ ballastless track / concrete bridge / creep / correction coefficient分类
交通工程引用本文复制引用
周东卫..高速铁路混凝土桥梁徐变变形计算分析及控制措施研究[J].铁道标准设计,2013,(6):65-67,72,4.
