The Construction Monitoring And Simulation Analysis Of Continuous Rigid Frame Bridge

With the continuous development of transport and the improvement of science and technology, it is need to build more greater span and reasonable bridge in the rivers and deep groove. The completion of the bridge was known to be a long-term and multi-step process. To ensure the accuracy of closure, the bridge line and design requirements after normal operation, it seemed especially important to predict the deflection of the upper structure of each construction stage and guide construction by the real-time measured value.With the increase of the girder segment cast with cantilever method and the constantly changing of the structure system, the increment of the girder segment could have effect on the line shape of bridge and the stress of structure. The influencing factors may lead to the difference of the practical value of line shape and stress and the design value. The line shape would be too twisted to shut and the structure would be unsafe if the difference wasn't controlled timely and even brought some hidden troubles in the structure.This paper introduces the development of construction monitoring at home and abroad. Detailed summary and analyze the theories of monitoring, the objective and the methods of construction monitoring and the error influence of the structure state. At last the Fu River Bridge adoptted orderly-erecting analysis method for calculation. The Fu River Bridge in hechuan district is a continuous rigid frame bridge. Based on the finite element theory,it was relatively right to adopt software Midas/Civil for calculation. The main design parameters were determined by the consequence of sensitivity analysis. According to the actual state, the correction of structure parameters and the model, the feedback of analysis results and the prediction of formwork erection elevation were completed for guiding construction better.Aiming at implementation of monitoring, this paper presented the principle of test instruments and detailed analysis about stress test errors. Through the elimination of the strain of concrete shrinkage and creep and the strain caused by temperature, the more realistic stress value was acquired.. Based on the grey theory, the formwork erection elevation was modified. And through the temperature monitoring, the effect of temperature on line shape was analyzed.Through the calculation of construction process, the monitoring results were analyzed compare to the theoretical results. The change of stress and line shape were mastered. At last the monitoring of the bridge was completed successfully.