上承式钢筋混凝土箱型肋拱空间仿真分析及应用

The Spatial Simulation Analysis and Application of the Deck Type Concrete Ribbed-Box Arch

以佛山市南海区五斗大桥为工程实例,对钢筋混凝土箱型肋拱建立空间有限元模型进行仿真分析,并进行荷载试验,对横向分布系数进行分析,分析认为:杠杆原理法与空间有限元法计算结果存在较大差异,杠杆法计算的偏载系数远大于空间有限元法,偏于安全,但过于保守、经济性差;而空间有限元法横向分布系数和结构实测吻合良好。建议引入修正系数对杠杆法计算荷载横向分布系数进行修正。

By taking Wudou Bridge in Nanhai District of Foshan City as an example of project, this paper makes the simulation analysis of the space finite element model established for the concrete ribbed-box arch and also makes the comparative analysis of the load test and the transverse distribution coefficient. Then it comes to the favorable conclusion that there is a bigger difference between the calculation results of the level principle method and the space finite element method, so the result of the eccentric coefficient calculated by the level method is much bigger than that calculated by the space finite element method, and it is safer but over-conservative and less economic, whereas the result calculated by the space finite element method matches the transverse distribution of the structural measurement. It is advised that the correction coefficient should be adopted to correct the load transverse distribution coefficient calculated by the level method, which can better show the real state of the structure and guide the design work.