Construction Control Andanalysis Of Single Pylon Concrete Cable-stayed Bridge Without Backstage

Study on the single pylon concrete cable-stayed bridge without backstage inconstruction. Various components of the bridge by force fluctuations in operatingconditions change. Statistical datum and researches have indicated which thecable-stayed bridge was not carry out monitoring and analysis in construction process, itis difficult to reach the ideal bridge state linear internal force, and involving the safetyof the Bridge. The reason is that the design stage cannot predict the site conditions,environmental parameters, material parameters and their model tracking adjustmentfrom time to time under field conditions, to reach the state of the ideal bridge,cable-stayed bridge construction process for accurate simulation analysis and forecast.The thesis is to study on a single tower cable-stayed bridge construction, no dorsalcolumn monitoring data to identify the extraction of the single tower cable-stayedbridge construction, no dorsal column process simulation method and the temperaturefield parameters in the construction process. Main contents and results are as follows.In the process of Hua Jian bridge-site construction monitoring, review the need formonitoring of single tower cable-stayed bridge construction, no dorsal column, thecable-stayed bridge construction process simulation analysis methods were analyzed, aswell as bridge construction, controlling for other factors and error handling Analysis.Based on the Midas-Civil software platform, the three-dimensional numerical modelwas establishment. Zero-displacement method to determine a reasonable bridge, use thesoftware is not closed with the power function for solving the cable-stayed constructionof the initial tension, and then the cable-stayed bridge construction process simulationsuits, get the main construction phase beam internal force, deflection, stress Sarasotaand cable internal forces, and select the most dangerous construction stages to focus on stress analysis, and finally compared with field data. Studies have shown that in themodeling process, the timely identification of the parameter adjustments, the simulationresults with the measured values close to.Combination of Fugu County, Shaanxi Province, Hua Jian bridge constructioncontrol box girder for three consecutive days the temperature field and temperatureeffects are observed as well as the bridge temperature parameter identification, theclassical theory based on the heat transfer, the establishment of the numerical model, theuse of transient thermal analysis, and draw the corresponding theoretical temperaturefield. Compared with the analysis of the measured temperature gradient value,regression analysis, Deduced computing model for concrete box girder temperaturegradient in Northern winter.It is proposed to establish relationship between measured strain and differenttemperature actions by robust regression model. The bridge the surroundingenvironment parameters and the various components of the bridge temperatureparameters was Identification. By the measured variables and the dependent variablewas analysis, robustness analysis, to sum up its own rules. Calculations show that theirmodel can predict the temperature effects of the concrete box girder, to provide areliable means for the separation of the bridge temperature effect.