Bridge dynamic strain monitoring system calibration method

Abstract

The invention provides a bridge dynamic strain monitoring system calibration method which is mainly characterized by comprising the following steps: placing a standard sensor on one side close to a sensor to be calibrated in parallel, adjusting the direction to enable the sensor to reach a test state, connecting the standard sensor and the sensor to be calibrated to a common-source excitation multi-source data acquisition instrument, starting a data acquisition function, performing dynamic monitoring on a bridge structure under a passive excitation condition, wherein signals generated by two sensors are the same under a default normal condition under a common source excitation condition or are the same when a data sequence change trend is the same. The portable data acquisition instrument performs data acquisition on the standard sensor of the online monitoring system and the sensor to be calibrated of the monitoring system at the same time to obtain measurement data of the strain monitoring and standard sensor, and the advantages are that the portable data acquisition instrument and the standard sensor can be used for detecting and identifying the sensor on a bridge, whether the sensor breaks down or not is judged, and thus the accuracy of the bridge monitoring system is improved.

Description

technical field [0001] The invention relates to a bridge monitoring system, in particular to a dynamic calibration method for a bridge strain monitoring system. Background technique [0002] There are more than 830,000 bridges in my country, including more than 95,000 large bridges and super-large bridges. The use of new materials, new equipment, new structures, and new techniques has injected new vitality into the field of road and bridge engineering, and has also brought many hot issues that need to be studied and solved. Among them, a series of issues related to infrastructure security have become one of the focuses of scholars. [0003] According to a study by Chinese scholars, in the 15 years since the beginning of this century, more than 300 bridges have collapsed due to various factors in our country, and 43% of the collapse accidents occurred during the construction period. From the analysis data, the average service life of bridges that collapsed during service pe...

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Problems solved by technology

[0008] Third, the development of traditional measurement technologies such as mechanics, length, and time constitutes a basic support for the field of engineering measurement, but cannot meet the needs of measurement technology in specific engineering application fields

[0015] Most of the strain monitoring sensors in the bridge monitoring system are collected at a frequency of 20Hz, and static measurement cannot measure the working sensors

[0016] Due to different layout techniques, it is difficult to measure a single sensor

[0017] At this stage, the data collected by in-service sensors is greatly disturbed by environmental errors, which increases the difficulty of traceability of sensor values

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