铁道科学与工程学报Issue(2)：335-341,7.
大跨径连续刚构桥中跨合龙顶推力研究
Study on mid-span jacking force for long span continuous rigid-fra me bridges
摘要
Abstract
This paper summarized the factors that influence the middle span jacking construction for long-span continuous rigid-frame bridges,and the calculation method of the jacking force and jacking displacement.U-sing this method,the jacking force and jacking displacement of a long -span continuous rigid -frame bridge across Qian River were calculated.Finite element analysis was utilized in this paper for estimating the influence of the middle span jacking construction on the mid -span deflection,the stress of main -girder,the bending moment and stress state of the bridge under the effect of dead load and 10 years’shrinkage and creep,which proved the rationality and validity of the middle span jacking construction.The results show that the construction method is reasonable and correct.The jacking closure construction method can improve the stress state of the bot-tom of the main pier.And with the use of pre-camber,it can effectively solve the mid-span deflection dis-ease.Finally,this paper proves that the jacking force and jacking displacement on this bridge can meet the de-mands of safe-construction and normal operation stage.关键词
大跨径/连续刚构桥/顶推力/顶推位移Key words
long span/continuous rigid-frame bridge/jacking force/jacking displacement分类
交通工程引用本文复制引用
李军,曾一帆,陈辉,刘学明,宋旭明,马昆林..大跨径连续刚构桥中跨合龙顶推力研究[J].铁道科学与工程学报,2015,(2):335-341,7.基金项目
国家自然科学基金资助项目（51108463）；中铁上海工程局集团有限公司科研项目 （）
