FEM Analysis And Construction Control Of Reinforced Concrete Arch Bridge Without Wind Bracing

In recent years, arch bridges without wind bracing have come to engineers' attention because of their beautiful shape and widen visual field. For this type of bridges, the stability control is the same important as the deformation and stress monitoring because of their weak rigidity. In this thesis, on the background of Fenghuang Bridge in Enshi city of Hubei province, firstly, the project survey and construction technique of this bridge are introduced. Then, the structures' deformation, stress and stability during construction procedure are simulated and studied using the FEM method. Also, the construction control schemes are detailed established. Lastly, the monitoring data errors are analyzed, and the conclusions prove that the bridge construction control is succeeded. The detailed task contents are as follows.1. The three-dimensional finite-element model of Fenghuang Bridge is founded with the help of MIDAS/Civil. Considering some influences such as temperature, concrete shrinkage and creep, the arch ribs' deformation and stress during construction procedure are simulated. Also, the feasibility of scheme that masts are used in hoisting course of arch ribs is established. The results and conclusions supply reliable theory dates for the construction control.2. The analysis results which consider the nonlinear idiosyncrasy of the structure indicate some conclusions, for example, the nonlinear effect is most noticeable to the quarter part of arch rib, and strengthening the arch ribs' rigidity is the best way to weaken the nonlinear effect.3. Through stress data processing and error analysis, the stress test results are approximate to actual stress of structure. It provides a basis for stress analysis, design change of structure and construction quality evaluation.4. For the first category of stability, buckling eigenvalues of the finished phase and main construction phases are computed under different combined loads with the help of MIDAS/Civil. Based on the characters of the bridge, parameters like wind load which influence buckling eigenvalues of the bridge are analyzed, and the influencing trend on buckling eigenvalues of the long span arch bridge is achieved in aim of instructing the design of the same bridge types.