Simulation Analysis And Curing Effect Research Of Curved Continuous Rigid Frame Bridge During Cantilever Construction

This thesis take one pre-stressed concrete cured continuous rigid frame bridge as an object of the study, by using the finite element software MIDAS\Civil, builds up a three dimensional simulation analysis models during the stage of cantilever construction. The calculated theoretical results and data actually measured during construction were compared to prove the precision of calculation results. Meanwhile, central angle of curving was changed through systematic change in radius of curve in the cured continuous rigid frame bridge to analyze displacement of the beam in the cured continuous rigid frame bridges with different central angle of curving. The impact of curing of the beam on the construction stage of cantilever is discussed, and some useful conclusions were obtained, which can be used for construction and design of the similar bridges for reference.The results show that MIDAS/Civil can simulate and analysis rigid frame bridge exactly in each construction stage and each construction status. However, there are some differences between calculated value and actually measured value due to the pre-digestion of calculation model to the actual project, which is greater as the construction goes on or a distance further to the pier. The deformation impact law of curing in the beam on the construction of cantilever: with the reduction of radius of the curve, the central angle of the curve in the curved continuous rigid frame bridge, difference between the value of vertical deformation of the curved bridge and that of straight bridge in the same position point during construction of cantilever, and difference of lateral deformation value becomes more and more great, Moreover, with the linear increase of central angle of the curve, the two differences increase linearly approximately. When the central angle of the curve increases to certain extent, the two differences increase as a shape of parabolic curve. For the three-span continuous rigid frame bridge, if the central angle of the curve is less than 21.28°, the two differences is not great, and it can be treated as a straight bridge. Otherwise, impact of curved central angle on the construction of cantilever in the curved continuous rigid frame bridge should be taken into account.