关键词: 钢管混凝土, 力学性能, 黏结滑移, 稳定性

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