Construction Stress Analysis And Control Of Long-span Arch Bridge

In recent years, as a new type bridge style, the concrete-filled steel tube (CFST) stiffness skeleton arch bridge has been rapidly developed because of its merits such as aesthetics, economy and construction convenience. But the research on construction process stress analysis and construction control of this bridge lags relatively. In order to guarantee the stress security in construction process of the CFST skeleton arch bridge. Based on the engineering background of PingYiKou XiangXi River Bridge, the construction stress analysis and control of long span arch bridge are researched. The main research contents and achievements are as follows:1. Based on the basic principle of non-linearity mechanics, the material and the geometry nonlinear analysis theory for bridge structural, as well as the solution of nonlinear equation making use of Newton-Raphson Method and the revised Newton-Raphson Method are elaborated in detail, which provide the rationale for the following construction process stress analysis.2. In view of the actual construction flow of stiffness skeleton arch bridge, the space model is established with the aid of the large-scale finite element procedure ANSYS. The fine simulation analysis of construction process of the PingYiKou XiangXi River Bridge is carried on and the development situations of stresses of the steel tube stiffness skeleton and main arch ring along with the construction process are studied too, all of which provide the theory basis and the instruction for the construction control.3. The analysis of stability of this bridge at different construction step is carried on. The destabilization types and positions of different construction step are obtained through studying the stable safety factor and the corresponding modal chart of different construction step. The corresponding measure is proposed for the construction stage with lower stable safety factor in order to enhance the safety stock.4. Aim at the construction characteristic of the CFST stiffness skeleton arch bridge, the construction control plan is formulated in detail. The entire process monitoring of the stress and the distortion of PingYiKou XiangXi River Bridge at each construction stage are carried on and good effect is obtained. 5. Aim at the stress characteristic, the construction craft and the construction control method of the CFST stiffness skeleton arch bridge, the corresponding research and the related experience are conducted, which provides the reference for the construction of similar bridge.