高速铁路无碴轨道预应力连续梁徐变影响分析

随着我国高速铁路事业的发展,越来越多的大跨连续梁桥得到应用.但是过去建设的大跨连续梁已有不少出现了挠度增大及表面开裂等现象,引起这些现象最重要的原因是混凝土的收缩徐变效应.本文选取合理的徐变系数后,从相对湿度、加载张拉龄期、二期恒载上桥时间三个因素对徐变影响进行研究,提出控制后期挠度变形的建议.

Shrinkage and creep influence analysis of prestressed concrete continuous girder of high-speed railway ballastless track

With the development of high-speed railway in China,more and more long-span continuous bridges are under construction,but the construction of long span continuous beam which were built in the past have been appeared some negative phenomenon,such as deflection increasing and surface cracking.The most important cause of these phenomena is due to shrinkage and creep effect of concrete.Therefore,this paper select the reasonable creep coefficient,from the relative humidity,load tension age,the additional dead lo...