悬臂施工钢桁架桥预拱度确定方法研究及工程实践  

Research and engineering practice on determining method of pre-camber of cantilever construction steel truss bridge

作　　者：李冲 范进[1] LI Chong;FAN jin(School of Science,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学理学院,江苏南京210094

出　　处：《四川建材》2023年第5期116-117,122,共3页Sichuan Building Materials

摘　　要：随着大跨钢桁架桥的大量修建,悬臂拼装的施工方法得到越来越广泛的应用,这也使得施工线形控制问题日益凸显。针对下承N式钢桁架桥,首先采用切线初始位移法计算原理分析制造线形的关系式,然后以几何法为依托建立上弦杆伸缩量与制造预拱度的函数方程,建立预拱度最优化模型得到合适的上弦杆伸缩量,最后与工程实例的设计数据做对比,证明该方法可行。With the large-scale construction of large-span steel truss bridges,the construction method of cantilever assembly has been widely used,which also makes the problem of construction alignment control increasingly prominent.In this paper,for the bottom-bearing N-type steel truss bridge,firstly,the tangent initial displacement method is used to analyze the relationship of the manufacturing line shape,and then the functional equation between the expansion amount of the upper chord and the manufacturing pre-camber is established based on the geometric method,and the maximum pre-camber is established.The optimized model is used to obtain the appropriate stretching amount of the top chord.Finally,the design data of the engineering example is compared to prove that the method is feasible.

关 键 词：切线初始位移法 几何法 伸缩量 最优化模型 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]