关键词: 脱空, 界面拉应力, 黏结强度, 水化热, 温度

Abstract: On the basis of brief introduction to the status quo of concrete-filled steel tubular（CFST） arch bridge disengaging, the impact of temperature from different sources on longitudinal tensile stress and radial direction tensile stress which is in interface between steel tube and core concrete is analyzed. The results show that： in arch rib longitudinal direction, the relative slip in interface between steel tube and core concrete is caused by the difference in temperature resulting from hydration heat, sunlight and the changes of atmospheric temperature; in arch rib radial direction, the concrete will be disengaged because of the difference in temperature resulting from sunlight and the changes of atmospheric temperature.

Key words: disengaging , interface tensile stress , bonding strength , hydration heat , temperature ;