Application Of The Least-Squares Method In Construction Control Of Hybrid Beam Cable-Stayed Bridge

The Self-adaptive control method also known as the parameter identification,is that when there exists a large gap compared the measured internal force and deformation with the calculation results of the model, the errors are input to the process to identify and adjust the design parameters until the output are consistent with the actual measured results.At this point, the structural designed parameters are used to recalculate the construction phase of the ideal state and forecast the next phase of the construction. After several cycles of repeated recognition and adjustment, the calculation model and the actual structure will arrive at the basic line, meanwhile to make the construction control better.Takeing the EDONG Yangtze River Highway Bridge for example,this thesis calculates the structure by the analysis software NLABS. First of all, analysis the impact on the stress of the concrete box girder by simulating the stiffness of support in the different conditions.Then,by the least-squares method to adjust parameters of the main design parameters and recalculate so that the measured values are as far as possible consistent with the theoretical values calculated.The adjusted parameters are used to forecast the next phase of construction and the results were compared with the actual measured results. As a result, the least-squares method is applied successfully in the construction control of hybrid beam cable-stayed bridge.