Research In Bridge Monitoring In Adaptive Control Theory Considering Temperature Effect

With the development of economy, our country transportation is also constantly developing, Prestressed concrete continuous beam bridge has play a decisive role status in our country bridge construction. But whether highway or railway continuous beam bridge with continuous beam bridge, in the construction of more or less will appear linear construction and design of linear and beam body by differences between the force and the design value. Therefore, to ensure that the prestressed continuous beam bridge can meet the design requirements in force and linear construction and bridge, it is necessary to carry out monitoring in construction process. The deflection of bridge in the construction process and the stress is influenced by many factors, such as measurement error, parameter error, if the error can not be timely correction in the construction process, will lead to difficult closure, bridge deck line wavy, and will affect the safety of bridge, reduce the service life. This paper takes the toudao Songhua River bridge as the engineering background, combined with the adaptive optimal control theory, and summarizes the domestic and foreign prestressed continuous beam bridge successful monitoring examples, and puts forward some new ideas and measures of monitoring, and formed a set of control theory and process, the application of this theory to guide toudao Songhua River bridge construction has achieved good results.This paper mainly studies the:1.research the development and monitoring theory and method at home and abroad of prestressed continuous beam bridge.2.introduces the main contents of construction control, and analyses the method of forward analysis, inversion analysis method, no difference in stress state analysis of three methods, explore the development thought of construction control.3.summarizes and analyzes the three kinds of calculation methods of degree of preach, and the variety of deflection calculation methods are compared.4.using the large finite element software MIDAS/CIVIL simulation calculation and Simulation Analysis on the first Songhua River bridge, and carries on the parameter sensitivity analysis, through the analysis discovery, weight and prestressed is the impact of bridge deflection and stress of main parameters. According to the measurement error occurred in the construction, construction error and parameter error, using the Kalman filtering method to filter out the construction error and measurement error, and using least square method for parameter estimation, which makes the model error is corrected.5.to study the bridge monitoring using adaptive monitoring theory, according to the division of the construction phase, will be divided into two stages, the adaptive control process. As the cantilever construction before the 5# block is less affected by the temperature, without considering the influence of temperature, as its control of the first stage, the 5# block after the temperature effect can not be ignored, when considering the effect of temperature control will be listed as the control after the second stage.6.In the construction process control of toudao Songhua River bridge as an example, describes the whole process of construction control and the details, such as:sensor layout, stress measurement, deflection measurement, error identification, vertical mold elevation adjustment etc.. In the second stage control, considering temperature effect after the combination of the Kalman filter method can accurately identify a variety of error analysis in the process of construction, which can provide more accurate construction of precamber, timely adjust the elevation of form work, the ideal linear, reasonable stress for the bridge and laid a foundation for the successful closure. The control results show that, by using two stage control method to control the linear. on the bridge after closure, according to the analysis and comparison of the theoretical value of the measured values, the maximum deviation linear only 1.3cm, deflection control within the scope allowed error of 20mm, and the whole bridge smooth linear, stress monitoring results in the admissible range.