Construction Control Research And Temperature Effect Analysis Of Long-Span Continuous Rigid Frame Bridge With High Piers

With the development of bridge construction, more and more continuous rigid frame bridges with high pier and long span have been used. For guaranteeing their safety and quality in construction process, the research on construction control technique is necessary.In this thesis, the main structural analysis methods of construction control for long-span bridges, which are named sequential calculation method and anti-sequential calculation method, are discussed firstly. Then the calculation method suitable for continuous rigid frame bridge is carried out. Secondly, taking Muguaxi Bridge in Chongqing Fengjie as a project background, the sensibilities of main design parameters are carefully analyzed, and the conclusions that construction weight, prestressing force, shrinkage, creep, and temperature influence the internal force and deformation greatly are obtained. Thirdly, taking Muguaxi Bridge as an example, the content and method of construction control are introduced, including line-shape supervision, stress supervision and stability supervision. According to Eluer elastic theory, the stability of every construction stage is analyzed, and the conclusion that the stability of the longest cantilever phase is the worst is abtained. By contrasting and analyzing the structural stability of every load condition under the longest cantilever phase, the load conditions which have more influence to the structural stability are abtained.Based on introducing temperature effect and three basic analysis methods of temperature field, concrete inner temperature field in the sunshine depended on theory and experience is carried out. The temperature field is acted on girders and piers separately, and the influences of solar temperature difference to deformation and stress of bridge in cantilever construction process are analyzed. And then the influences of annual temperature difference to deformation and stress of bridge are analyzed. And some conclusions are obtained. At last, the research orientations in future have been advanced.