Application Of Least Square In Concrete Cable-Stayed Bridge Construction Control

In the paper, control theory classification and its history is introduced first, then comes the importance of construction control in bridge construction, its contents and influence factors. And then expatiated on the cable-stayed bridge construction control, which includes: the method of the construction control, the computer simulation, the design parameters which cause bridge structure errors. Least squares basic principle and it application on cable-stayed bridge construction control are emphasized.Take the Chongqing Diwei Changjiang road bridge as an example, and use ANSYS to analyse the bridge structure. To ascertain the sensitivity of the design parameters, change each design parameter respectively, and calculate the deflection and stress difference of the control point. By the result, ascertain the primary design parameters. Then adjust the primary design parameters by least squares, and recalculate to make the calculated accords with the actual value. And according to the adjusted parameters, forecast the next stage. And compare the results with which calculated by the actual adopted construction control system. In the end, some problems in construction control are given, which should be solved in the future.