祁家渡黄河大桥180m拱桥整体稳定性分析

Integral Stability Analysis of Qijiadu Yellow River Bridge

为分析研究跨度大、宽跨比小的上承式钢管混凝土拱桥的整体稳定性,该文以甘肃主跨180m,宽跨比为1/25.7的上承式钢管混凝土拱桥为例,建立了全桥施工全过程三维有限元模型,计入几何非线性影响,详细分析了该桥成桥状态和施工过程中的横向稳定性,讨论了桥面系边界条件的处理,分析了对其结构整体稳定计算结果的影响,得出了一些有益的结论。

In order to analyze and study the integral stability of deck steel-tube concrete arch bridge with long span and small width-span ratio,the article takes a deck steel-tube concrete arch bridge with 180-m main span and 1/25.7 wide-span ratio in Gansu Province as an example to set up the three-dimension finite element model for the whole process of bridge construction,lists the geometrical non-linear influence,analyzes in detail the completion status of this bridge and the transverse stability in the course of construction,discusses the treatment of deck boundary condition, analyzes the influence on the calculation result of its integral structural stability,and gives some benefit conclusion.