Method for performing bridge monitoring by using multiple strapdown inertial systems

Abstract

A method for performing bridge monitoring by using multiple strapdown inertial systems belongs to the bridge monitoring technology and includes: performing position setting for the strapdown inertial systems according to the dynamic characteristic of a bridge structure and performing installation calibration and initial calibration for the strapdown inertial systems; carrying out bridge dynamic load tests which include a pulsating test, a sports car test and a bumping test, and performing continuous monitoring by using deformation and vibration information of the strapdown inertial systems relative to a reference point and measurement points; obtaining static deformation angles and dynamic deformation angles of the measurement points of the bridge at each moment by using the deformation information obtained in an inertial test matching method; obtaining a girder deflection curve of the bridge by using the dynamic deformation angles of the inertial systems calculated at the reference point and the measurement points, and obtaining an impact coefficient of the bridge through further processing; using accelerometer output information to obtain acceleration time history curves of all the measurement points and obtaining displacement time history curves through integration; and analyzing the acceleration time history curves and the displacement time history curves in a time domain analysis method and a frequency domain analysis method to obtain structural parameters including bridge amplitude, damping ratio and vibration mode. The method has the advantages of being free of weather variation interference, little in manual operation, high in automatic degree and capable of performing continuous measurement.

Description

technical field [0001] The invention belongs to a bridge monitoring method, in particular to a bridge dynamic deformation, deflection distribution and structural dynamic characteristic measurement technology based on a strapdown inertial system. Background technique [0002] According to the "Highway Bridge and Culvert Maintenance Specifications" (JTG H11-2004) promulgated by the Ministry of Communications, the maintenance of highway bridges and culverts is based on the principle of "prevention first, combining prevention and control", centering on bridge deck maintenance, focusing on load-bearing components, strengthening Comprehensive maintenance. The maintenance of highway bridges and culverts requires periodic inspections of highway bridges and culverts, to systematically grasp their technical conditions, and to detect defects and changes in related links in a timely manner. According to the bridge inspection results, the technical status of the bridge is classified and...

AI Technical Summary

Problems solved by technology

However, it is still blank to apply the strapdown inertial system to bridge monitoring to measure the structural parameters of the bridge, such as static and dynamic deformation angles, deflection curves of main girders, damping ratios, and impact coefficients.

Images