Research On Temperature Field And Temperature Effect For Dumbbell-shaped Concrete-filled Steel Tube Arch Bridge

Based on the existing bridge engineering, the hydration heat temperature field and temperature effect of dumbbell-shaped concrete-filled steel tube arch bridge is studied. The time-dependent deformation and distribution features of hydration heat temperature field and temperature effect are mainly analyzed. Besides, based on theoretical calculation results, the perfusion sequence on arch rib is optimized.(1)Based on heat conduction and thermo-dynamic finite element basic principle, the basic analyze process of hydration heat temperature field and temperature effect of dumbbell-shaped concrete-filled steel tube arch bridge when analyzing construction stage using finite program is obtained. According to existing temperature filed theory, the basic hydration heat temperature field assumption is cleared.(2)Based on the hydration heat temperature field analyzing method, the choice of finite model parameters are discussed and temperature checking data is used to verify accuracy and feasibility of finite analyzing method. Based on existing bridge engineering, the hydration heat temperature field and temperature effect of dumbbell-shaped concrete-filled steel tube arch bridge is studied.(3)According to the perfusion sequence on arch rib combined with the hydration heat effect in concrete perfusion phase, the influence that perfusion order causes to the stress and deformation of dumbbell-shaped arch rib is analyzed to put forward the optimization method of concrete perfusion sequence optimization, providing theoretical basis for similar engineering.(4)Based on finite model of an existing bridge, the factors which influence the hydration heat temperature field are analyzed and compared to conclude the influence degree to the temperature field distribution characteristic and the changing law so as to accumulate experience of bridge engineering design and construction.