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.
作者
李冲
范进
LI Chong;FAN jin(School of Science,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《四川建材》
2023年第5期116-117,122,共3页
Sichuan Building Materials
关键词
切线初始位移法
几何法
伸缩量
最优化模型
tangent initial displacement method
geometric method
stretching amount
optimi-zation model
