The Analysis And Engineering Application Of Shear Lag Effect On Continuous Rigid Frame Bridge During Construction

This paper by Sanchagou Bridge construction monitoring project, which based on the theory of energy variational method, the data of monitor construction, and finite element model data as a reference, analyze the highway Single Cell Box rigid frame bridge construction shear lag phase. The thesis consists of eight chapters, the first chapter of Shear Lag existing research methods and results are reviewed. The second and third chapters using the energy variational method for shear lag effect analysis. The fourth chapter of the bar system accuracy and solid finite element model for verification. The fifth chapter uses the measured data to the main cross-sectional distribution of shear lag analysis. Chapter VI of the cantilever construction stage, the main segments with shear lag effect of variation of the construction phase of the analysis. Chapter VII analysis gravity load, prestressing load, shear lag effect on the distribution of the prestressed steel distribution analysis. This paper mainly completed the following work:1. Using the energy variational method, it is assumed longitudinal displacement function of five parabolas respectively Izod, Charpy shear lag theory formula under different loads derivation, shear lag solved formulas, and use examples calculation methods compared with results of other calculation.2.Using the measured data to verify the calculation results of the MIDAS CIVIL model and MIDAS FEA model in this paper, and verified the accuracy of the model.3. Based on the measured data of Sanchagou Bridge, respectively,to analysis and summarized the serious section of rigid frame bridge of roof and bottom with the construction phase of the shear lag coefficient change regular.4. To Sanchagou Bridge model data as a reference to the main cross-sectional shear lag effect in five consecutive working conditions were analyzed, and it is concluded that under the working condition of the same type of different segments, working condition of different kinds of the same piece of shear lag coefficient variation regular.5. Establish gravity loads, prestressing loads only, full loads MIDAS CIVIL model and MIDAS FEA model to analyze gravity, prestressed tension on the distribution of shear lag effect in the weight load is drawn prestressing causing rigid frame bridge shear lag effect of the most important factor. Prestressing steel roof anchor arrangement position corresponding to the block member is the emergence position of the maximum shear lag effect.6. Summary of the full-bridge construction stage distribution regularity of shear lag effect, on the basis of these results for large span continuous rigid frame bridge design and construction of some suggestions are given, for the shear lag effect of the same kind of bridge has reference meaning to study and preliminary design.