Accuracy Prediction and Evaluation Method of Arch Rib Deformation Measurement of Long-span Arch Bridge by Inclination Sensor

Abstract

The invention belongs to the technical field of large-span bridge deformation monitoring, and relates to a prediction and assessment method for measuring the deformation precision of arch ribs of large-span arch bridges by a tilt angle sensor. When the tilt angle sensor is utilized to measure the deformation of an arch rib of a large-span arch bridge, the measurement precision of the arch rib under different deformation conditions is predicted and assessed, and a sensor layout plan satisfying the measurement precision requirements under multiple working conditions is comprehensively selected;and by considering the structure characteristics of the arch rib, a base is set to ensure that the sensors mounted on the arch rib are on a same horizontal plane. According to the method, the deflection deformation of the arch ribs of the large-span arch bridges is researched, and by considering the influences of the fragment errors and the angle measurement errors of the tilt angle sensor when the curves are replaced by straight lines in the deformation of the arch ribs, sensor layout manners satisfying the precision demands of arch rib deflection deformation projects are designed, so that the measurement result precision ranges and the reasonability of the assessment layout manners are predicted. The method for carrying out theoretical analysis in advance has important significance for the final field measurement.

Description

technical field [0001] The invention belongs to the technical field of deformation monitoring of long-span bridges, and relates to a method for predicting and evaluating the deformation accuracy of an arch rib of a long-span arch bridge measured by an inclination sensor. Background technique [0002] Arch ribs are the main stress-bearing components in the arch bridge structure, and their condition largely determines the safety of the bridge. Once the stress-bearing structural system is damaged, all or most of the arch bridge as a whole will fail. Arch rib deflection is the vertical deformation of the arch rib under various load effects. This deformation can directly reflect the vertical stiffness of the arch bridge structure and is the most important technical parameter for judging the bearing capacity and integrity of the arch bridge structure. One, the real-time change monitoring of the deflection of the arch rib can find out whether there is any abnormality during the ope...

AI Technical Summary

Problems solved by technology

These models currently applied to the deformation of girder bridges do not consider the impact of segmentation error and angle measurement error of the inclination sensor on the measurement results, do not predict and evaluate the accuracy of the measurement results, and ignore whether the accuracy of the final deformation measurement is true or not. The problems that can meet the requirements of actual engineering measurement

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