摘要
研究目的:目前,国内对于预拱度设置研究多集中于悬臂法施工的连续刚构及连续梁桥,对钢桁梁预拱度设置的研究则很少,而对钢桁梁斜拉桥预拱度设置的研究则几乎为零。本文对钢桁梁斜拉桥理想预拱度的设置方法进行研究探讨,为该类桥梁的设计与施工提供指导。研究结论:对于钢桁梁斜拉桥,将各上弦杆的长度调整量设置为变量,并将各上弦杆长度调整量对节点拱度或其它约束条件的影响向量组成带约束条件多元方程组,约束多元方程组解的范围,求解其最逼近的一组解便得到与理论值几乎完全一致的预拱度值。通过对理论解进行取整、合并与调整后便可获得结构较理想的预拱度。
Research purposes： So far,in China the study on the pre-camber calculation mostly focuses on the continuous rigid structure and continuous girder bridge constructed with the cantilever erection method while a little on the pre-camber of the steel-truss girder bridge and little on the pre-camber of the steel-truss girder cable-stayed bridge.This paper studies the calculation method for the pre-camber of the steel-truss girder cable-stayed bridge and it can provide the reference to the design and construction of pre-camber of the similar steel-truss girder bridge in the future.Research conclusions：To the steel-truss girder cable-stayed bridge,firstly,the length of the upper chord should be set as variables and the multiple constraint equations should be established to the influence vectors of the the length change of the upper chord on segment camber or other restriction conditions.Then,the solution circumscription should be given and the most closed ones should be solved to get the pre-camber that is the most closed to the theoretic results of the multiple constraint equations.Finally,the theoretic solutions should be rounded,merged and adjusted to obtain the rather ideal pre-camber.
出处
《铁道工程学报》
EI
北大核心
2010年第10期78-81,共4页
Journal of Railway Engineering Society
关键词
钢桁梁
斜拉桥
预拱度
影响向量
steel-truss girder
cable-stayed bridge
pre-camber
influence vector
