大跨度钢管混凝土拱桥施工阶段非线性稳定分析  

Nonlinear stability analysis of long-span CFST arch bridge under construction

作　　者：许凯明[1] 张明中 王佶[3] 

机构地区：[1]同济大学桥梁工程系,上海200092 [2]荷兰代尔伏特理工大学土木工程学院 [3]武汉理工大学设计研究院,湖北武汉430070

出　　处：《西安建筑科技大学学报（自然科学版）》2008年第4期556-560,566,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：湖北省交通厅资助项目(鄂交科教[2004]343)

摘　　要：湖北景阳河大桥为大跨度上承式钢管混凝土拱桥,净跨径为260 m,桥面宽9 m,宽跨比较小,该桥的稳定问题是施工控制的关键.本文介绍了钢管混凝土拱桥弹性屈曲、几何非线性和材料非线性的稳定分析方法,以景阳河大桥为工程背景,基于有限元理论,运用ANSYS建立空间有限元计算模型,进行大跨度钢管混凝土拱桥施工阶段的弹性屈曲和非线性稳定分析,得到了各个施工工况的稳定系数和失稳模态.研究结果表明:各施工工况下该桥的稳定系数都大于10,拱肋整体失稳的可能性很小;几何非线性对该桥稳定性的影响较小,而材料非线性的影响不容忽视.Located in Hubei Province of China, Jingyang River Bridge is a long-span concrete filled steel tube（CFST） arch bridge with a span of 260m and width of 9m. Due to the small ratio of width to span, the stability of the arch is crucial to the construction control of the bridge. In the paper, the stability analysis methods of elastic buckling, geometrical nonlin-earity and material nonlinearity are introduced. Based on the Jingyang River Bridge and finite element method （FEM）, the spatial model of the bridge is developed. Both the linear and nonlinear stability of long-span CFST arch bridge under construction are analyzed,and the result of which is used to provide the basis for the construction control. The results show that at every construction step, stability coefficients of the bridge are all larger than 10 and the instability possibility is small. The influence of geometrical nonlinearity is small. However, the influence of material nonlinearity is quite great and therefore should be wall taken into account.

关 键 词：钢管混凝土拱桥 有限元 施工阶段 非线性 稳定 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]