Static&Dynamic Analysis And Discussion Of Long-Term Deflection For Long-Span Continuous Rigid-Framed Bridge

The aim of this thesis was to study the static and dynamic analysis of long-span continuous rigid-framed bridge both during its constructions and finished stage, and its partial complex stress of the zero-block, and to preliminary discuss its long-term deflection, and the recently finished design of Jiangkou Jialing River Bridge was employed as engineering background.Firstly, a finite element model of the entire bridge based on beam elements was established using the MIDAS/CIVIL2012. The evolving internal forces and deformations of the bridge during constructions, as well as in the finished stage, were analyzed. Secondly, free vibration characteristics of the largest cantilever stage and in its finished stage were analyzed with the consideration of pile-soil interaction and pier-water interaction. Their influences on free vibration characteristics in finished stage were also compared. Based upon this, both the response spectrum method and time-history method were applied to study its seismic response. Thirdly, an integrated finite element model of the entire bridge was established using ALGOR finite element software, including solid element and truss element (637,002elements). Detailed stress distributions of the zero-block in the largest cantilever stage and in its finished stage were analyzed. Finally, the long-term deflection of this bridge was analyzed, and effects of concrete creep, prestressing tendon loss and overloaded vehicular were taken into consideration. Based on the above calculation and analysis, suggestions of reducing the long-term deflection were proposed.