悬臂拼装桥主梁制造线形计算  

Computation of Fabrication Profile of girders in Cantilever Erection Practice of Bridges

作　　者：张安林[1] 郑报文[1] 夏伟[1] 

机构地区：[1]安徽省交通勘察设计院有限公司,安徽合肥230011

出　　处：《安徽建筑大学学报》2015年第1期21-24,共4页Journal of Anhui Jianzhu University

摘　　要：斜拉桥悬臂拼装施工速度快、质量高、适应性强,这种施工方法在国内外已经广泛应用,从而悬拼结构的施工线形控制问题开始凸现出来.为了使钢梁在安装过程中高质量对接并最终达到成桥线形,需将钢梁按制造线形在胎架上预拼.以某钢箱梁斜拉桥为工程背景,用有限元分析软件midas建立该桥模型,通过零初始位移法和切线初始位移法分别计算主梁制造线形.对安装新梁段与相邻旧梁段夹角从几何关系进行了推导证明,并据此给出了计算无应力制造线形的实用公式.Cable-stayed Bridge with cantilever assembling ,which have many advantages including fast construction ,high quality and adaptability ,has been widely used in the world .Profile control began to stand out in cantilever structure during construction .In order to make the steel beam docking in high quality during the installation process ,and eventually reach the design profile ,the steel girder need to pre-fight on the tire rack .A Cable-Stayed Bridge of steel box beam ,which model was es‐tablished used finite element analysis software Midas ,was taken as engineering background ,to elabo‐rate how to calculate fabrication profile of main beam using Zero Initial Displacement Method and Tan‐gent Initial Displacement Method .Angle relationship was derived through the geometric relationships between a new beam which will be installed and the adjacent old beam which has just been fixed ,and Practical formula of Stress-free fabrication profile was given accord to the result .

关 键 词：悬臂拼装 钢箱梁 施工控制 制造线形 

分 类 号：U448.28[建筑科学—桥梁与隧道工程]