摘要
单肋斜撑钢管混凝土拱桥是近年来出现的一种新型桥梁，以广梧高速双凤至平台段K111＋495跨线桥为例，考虑几何、材料双重非线性，运用通用有限元软件ANSYS，对其成桥状态下的稳定性进行分析。计算结果表明：成桥状态下各工况1阶线弹性失稳模态基本相同，其失稳模态为拱肋面外对称屈曲，稳定安全系数大于15，说明全桥的稳定性得到足够保证；相同条件不同活载工况下的稳定安全系数值相差不大；仅考虑几何非线性，各工况1阶稳定安全系数降低了5％～15％；而考虑几何、材料双重非线性，各工况1阶稳定安全系数降低了40％～50％。说明材料的非线性对结构稳定性的影响比较显著。
The concrete-filled steel tube （CFST） arch bridge with a single rib and inclined supports is a new type of bridge developed in the recent years. By way of example of the Kill＋ 495 flyover on the section from Shuangfeng to Pingtai on Guangzhou-Wuzhou Expressway, the spatial stability of the completion state of the type of the bridge is analyzed by the finite element software ANSYS and in consideration of the nonlinearities of geometry and materials. The results of the calculation show that the first order linear elastic instability mode under different load cases in the completion state of the bridge is basically identical. The instability mode is the out-of-plane symmetric buckling of the arch rib and the stability safety coefficients are greater than 15, indicating that the stability of entire bridge can be sufficiently ensured. The differences of the stability safety coefficients under different live load cases in the same conditions are not great. When the nonlinearity of the geometry is considered only, the first order stability safety coefficients under different load cases decrease 5%-15% and when the nonlinearities of both the geometry and materials are considered, the coefficients under different load cases decrease 40%-50%, further showing that the nonlinearity of the materials has significant influence on the stability of the structure.
出处
《桥梁建设》
EI
CSCD
北大核心
2009年第4期13-16,37,共5页
Bridge Construction
关键词
拱桥
钢管混凝土结构
单肋
斜撑
非线性
稳定分析
arch bridge
concrete-filled steel tube structure
single rib
inclined support
nonlinearity
stability analysis
