The Artificial Calculation And Construction Monitoring Of Long-Span Continuous Rigid Frame Bridge

The high-pier and long-span continuous rigid frame bridge is a multi-hyperstatic and complex spatial stress system, and it has many influence factors. The formation of final structure will have a complex process of system transformation, and it has limited adjustment measures to adjust the completed structure during its construction. Therefore, it is particularly important to carry out the structural analysis of the high-pier and long-span continuous rigid frame bridge at design phase. Based on the Pingzhai Bridge in Guizhou province, which is a high-pier and long-span continuous rigid frame bridge with 235 meters'main span, the analysis were carried out in this thesis, The design parameter were changed in order to sensitive analysis in theory. Based on the sensitive analysis of parameter The adaptive control system and forecast of error were used to construction monitor. Some work and achievements are followed:(1) The main beam of deflection and stress performance were calculated in Pingzhai Bridge during the construction stage and the automobile load,trailer load,worst load of service stage.(2)The design parameter were changed in order to analyse sensitive parameter, the differential analysis of deflection and stress were compared between the original design parameter and changed design parameter,which were compared to the result of original design parameter in order to calculate the difference of deflection and stress. The difference of deflection and stress were compared in different sensitive parameter. The main influence parameters were obtained during the construction stage, and then some useful conclusions for design and construction were drawn.(3) The emulator calculation of finite element software and formwork erection of relative height difference were used to the construction of Pingzhai bridge. Those measures avoid the influence of formwork erection of temperature.(4) The adaptive control system were used to construction monitor, the main beam were chosen as the control objective. The error was analysed between the measured value and the theoretical value, the least-square estimation rule were used to modify the main design parameter error, and some useful conclusions for design and construction were drawn.(5) Based on the Grey theory ,in order to predict the next construction displacement increment, the construction error were used to predict the model GM (1,1).Based on the design level and adjusted construction displacement increment, the formwok erection level were calculated. The construction stage are assure to approach the ideal construction state. (6)After adjusted by the adaptive control system and forecast of error, the stress of main beam were monitored in order to reflect the actual stress state of structure during the construction stage and service stage. It was assure that the main beam were in good stress order and under control.