On-line calibration method for bridge structure strain monitoring system based on passive excitation
A technology of bridge structure and calibration method, applied in measurement devices, instruments, etc., can solve problems such as uncontrollability of vehicle load and environmental conditions, and achieve the effect of quantitative characterization
Active Publication Date: 2021-10-08
RES INST OF HIGHWAY MINIST OF TRANSPORT
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However, due to the uncontrollability of vehicle loads and environmental conditions, online calibration based on such passive excitation will face multiple challenges in theoretical models and implementation schemes
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[0119] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.
[0120] Wherein, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical drawings, and should not be construed as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings will be omitted, Enlargement or reduction does not represent the size of the actual product; for those skilled in the art, it is understandable that certain known structures and their descriptions in the drawings may be omitted.
[0121] In the drawings of the embodiments of the present invention, the same or similar symbols correspond to the same or similar components; , "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional re...
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The invention discloses an on-line calibration method for a bridge structure strain monitoring system based on passive excitation. The method comprises the following steps: taking a dynamic load of a normal passing vehicle of a bridge as a passive excitation source to act on a bridge structure, wherein the RS system and the SMS system to be calibrated continuously and synchronously acquire strain data of the bridge structure, and form a measurement data sequence according to time sorting; calculating an instantaneous measurement error, a period measurement error and a basic error of the SMS system according to the measurement data sequences respectively collected by the RS system and the SMS system to be calibrated; and taking the instantaneous measurement error, and / or the period measurement error, and / or the basic error as a calibration basis, and carrying out online evaluation on the metering performance of the SMS system. According to the method, the dynamic load of a vehicle during normal passing of a bridge is taken as an excitation condition, a calibration chain is established through synchronous measurement of structural response parameters by a strain monitoring system and a reference measurement system, and quantitative characterization of online calibration characteristics is realized based on a metrological characteristic analysis model of large sample data.
Description
technical field [0001] The invention relates to the technical field of bridge safety monitoring, in particular to an online calibration method for a bridge structure strain monitoring system based on passive excitation. Background technique [0002] Strain monitoring is an important task for structural health monitoring of bridges, dams, and high-rise buildings. The metrological performance of the strain sensing system is an important guarantee for the accuracy of structural monitoring data, and it is also the basic premise for the structural monitoring system to play its role in damage detection, performance evaluation, safety early warning, and life prediction. [0003] Commonly used sensors for strain monitoring include fiber grating strain gauges, resistive strain gauges, and vibrating wire strain gauges. The common principle is to transform the structural strain measurement into the measurement of the strain of the sensing element itself through the conduction of struc...
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Login to View More IPC IPC(8): G01B21/32
CPCG01B21/32
Inventor 荆根强彭璐张冰郭鸿博
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT