The Artificial Calculation And Parameter Influence Analyse Of The Large Span Continuous Rigid Frame Bridge

In recent twenty years, with the fast development of prestressed concrete continues rigid frame bridge, which has a property of bond of beam and abutment, so not only maintain the advantage of comfort of continue girder, but also decrease maintenance cost because that there is no bearing of "T"beam. Continue rigid frame bridge is more and more widely used because of its high strength, lightful line type, convenient and fast construction, long-span ability. By taking the Dongying Yellow River Bridge as a project, finite element calculative model can be built. the construction process of prestressed concrete continue rigid frame is simulated and calculated, and a set of theoretic data are provided for checking and controlling of Dongying Bridge, and insuring to carry out successfully the check and control of the bridge. During the calculation and analysis, the choose of calculative model and use of calculative parameters can try to reflect the reality of bridge construction process, so which conduct bridge construction. Sensitivity analysis of many parameters are researched in this dissertation, it is known that prestressed force and self-weight and concrete shrinkage and creep and temperature influence deflection and stress of main girder dramatically, but the stiffness of structure does little. At the same time, predictive method is studied to adjust error analysis and to disposal field data in the paper, and the calculative method for camber for construction of the behind girder. Parameters that influence dramatically must be controlled strictly, and be adjusted during theoretic calculation according to actual parametric characteristics. The influence of temperature is different with the other parameters, which change with itself, and influences the deflection of bridge, so must be modified or obviated during the construction. The construction process is very complex for long-span continue rigid frame bridge, many parameters influence bridge status, effective construction control is demonstrated the quality and safety of the bridge. The introduce and summary of engineering project are presented in this thesis. Advanced raster techniques are used for strain measure during the construction and health monitor of the bridge, which have many characteristics, such as high accuracy and high durability and large distance measure, which has been an important measure way. The closure strategy of Dongying Yellow River Highway Bridge is emphasized to research, the main girder is placed for four months before closure of main span under the maximal cantilever condition, which is good for decreasing reap creep of main girder, which leads to rational mechanical behavior of the main girder and pier. The calculation process demonstrates that the closure strategy to some extent decrease concrete creep during service process, which insure the construction quality.