Abstract: The concrete-filled steel tube structure obtains the widespread application in the bridge and the architecture engi- neering, the bonding force between the concrete and steel tube influences both he bearing capacity and stability of the structure. The study of stability of the structure is based on the bond-slip theory between the concrete and steel pipe, the construction relations are established,and the bond-slip unit is realized by using existing structure anarysis FEM software. The influence of bonding degree between concrete and steel tube on the bulking loading and safety stability coefficients of the concrete-filled steel tube arch bridge is studied by a case stingudy. The findings indicate that the stability of arch bridge is inclined to no safety,if the bridge is based on the design with close bonding and no relative slip.

Key words: concrete-filled steel tube, mechanical properties, bonding-slip, stabiliy

摘要： 钢管混凝土结构在桥梁及建筑工程中得到广泛应用,而钢管和混凝土之间的黏结滑移性不仅对钢管混凝土 结构承载力有影响,而且对其稳定性也有较大影响。在研究了钢管与混凝土的黏结理论的基础上,建立了钢管与 混凝土之间黏结的本构关系,利用现有结构分析程序采用黏结滑移单元实现了这种本构关系下的模拟和分析,通 过示例说明了钢管与混凝土的黏结程度对钢管混凝土拱桥的整体屈曲荷载和安全稳定性系数的影响,研究结果表 明如果以黏结紧密且无相对滑移为设计依据,所得出的拱桥的稳定性结果偏于不安全。

关键词: 钢管混凝土, 力学性能, 黏结滑移, 稳定性