大跨度钢桁梁顶推施工横向抗倾覆研究

Research on Lateral Anti-overturning of Long-span Steel Truss Girder in Incremental Launching Construction

摘要:

桥梁的施工方法发展至今已不再是原来的单一选择,而是采用多种施工方法比对后的最优解,受限于地形、营运线等诸多因素的影响顶推施工成为许多钢结构桥梁施工的第一选择,因此对大跨度钢桁梁顶推施工的研究越来越重要。本文结合滨州市某100m钢桁梁顶推施工工程,采用有限元软件MIDAS/Civil对顶推施工过程中关键杆件的应力和挠度进行模拟分析并对钢桁梁的横向抗倾覆稳定性进行了参数化分析。结果表明：钢桁梁顶推施工过程中关键杆件的应力和挠度满足规范要求；钢桁梁的横向偏移对其抗倾覆稳定性影响较大；当风力等级大于6级时,对横向抗倾覆稳定系数有较大影响。

关键词:大跨度钢桁梁;拖拉式顶推施工;有限元分析;横向抗倾覆研究

Abstract:

The construction method of bridge developed to now is no longer the original single choice, but is the optimal solution after comparing various construction methods. Due to the influence of many factors such as terrain and operating lines, the incremental launching construction has become the first choice of many steel structure bridge construction methods. Therefore, it is becoming more and more important to study the incremental launching construction of long-span steel truss girder. Take the incremental launching construction of a 100 m steel truss girder in Binzhou City as an engineering case, the finite element software MIDAS is used to simulate and analyze the stress and deflection of key member bars in the incremental launching construction process, and the lateral anti-overturning stability of the steel truss girder is parametrically analyzed. The results show that the stress and deflection of the key member bars meet the requirements of the specification in the incremental launching construction process of steel truss girder. The lateral offset of the steel truss girder has a great influence on its anti-overturning stability. When the wind level is greater than 6, the influence on the lateral anti-overturning stability factor is great.

Key words:long-span steel truss girder; pull-type incremental launching construction; finite element analysis; lateral anti-overturning research