Method for detecting and correcting spatial line shape of cable-stayed bridge girder

Abstract

The invention relates to the field of cable-stayed bridge line shape detection, and discloses a cable-stayed bridge main beam space line shape detection and correction method, which comprises the following steps of: arranging rails on a main beam, and arranging a trolley between the rails; enabling the trolley to run and measuring the actually-measured spatial line shape of the main beam; meanwhile, testing the temperatures of set sections of the main beam, the main tower and the stay cable of the cable-stayed bridge, and acquiring the space linear increment at the actual temperature through calculation according to the temperatures of the set sections; subtracting the space linear increment at the actual temperature from the actually measured space linear to obtain the actual space linearat the design reference temperature; calculating the theoretical spatial line shape of the main beam at the design reference temperature through a finite element model; and evaluating the structuralstate of the corresponding working condition of the cable-stayed bridge according to the difference between the actual space line shape and the theoretical space line shape at the design reference temperature. The problems that in the prior art, linear data processing is complex, the method cannot be applied to the cable-stayed bridge cantilever construction period, and the temperature effect correction error is large can be solved.

Description

technical field [0001] The invention relates to the field of alignment detection of cable-stayed bridges, in particular to a method for detecting and correcting the spatial alignment of main girders of cable-stayed bridges. Background technique [0002] (1) The linear representation method of the main girder [0003] The spatial alignment of the main girder of a cable-stayed bridge is an important parameter for evaluating the mechanical state of the structure. In the construction control of cable-stayed bridges during the construction period, bridge load tests, and inspections during the operation period, the finite element method is generally used to calculate the theoretical parameters of the main girder alignment, main tower deflection, cable force, and structural strain. Then use various technical means to measure the actual values ​​of the above parameters, compare the actual values ​​with the theoretical values, and conduct comprehensive analysis to evaluate the state...

AI Technical Summary

Problems solved by technology

[0020] In view of the defects existing in the prior art, the purpose of the present invention is to provide a method for detecting and correcting the spatial alignment of the main girder of a cable-stayed bridge, which can solve the problems of complex alignment data processing, divergence of inclination integrals, and inapplicability in the prior art. During the construction period of the cantilever of the cable-stayed bridge, the temperature effect correction error is relatively large. It is an overall solution for the main girder alignment measurement and temperature correction oriented to the state assessment of the cable-stayed bridge. The temperature effect correction method can also be applied to the health of the bridge during the operation period. Real-time processing of monitoring data

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