Test and evaluation of the static and dynamic performance of the walking bridge erection machine

Abstract

The walking bridge erection machine is the main construction equipment for prefabricated bridges, in order to reveal the influence of its static and dynamic performance on the safety of bridge construction during the service period, taking the walking bridge erecting machine used in the construction of a viaduct in Wuxi as the research object, a simplified mechanical analysis was conducted to determine the dangerous control section of the structure. A vibrational chord strain gauge was used to measure the strain of the control section, and the structural strength was evaluated. The corresponding computer vision dynamic monitoring program was compiled based on the Kanade-Lucas-Tomasi algorithm, the deflection of the control section was measured by the total station, and the rigidity of the structure was evaluated. Based on the dynamic monitoring program, the dynamic displacement of the structure was extracted to analyze the dynamic characteristics. Numerical simulations were implemented, and their results were mutually verified with the test results. The study findings indicate that the simplified mechanical analysis can effectively predict changes in the internal force during the loading process and can pre-evaluate the stiffness of the structure. The measured results are in good agreement with the numerical simulation results, proving that the strength and stiffness of the bridge erecting machine can meet the requirements. Moreover, the rationality and validity of the modeling and measurement methods in this paper are verified.