System and method for rapid testing and evaluation of non-contact bridge structure performance and safety

Abstract

A non-contact bridge structure performance and safety rapid testing and evaluation system and method, by setting the transmission beam of the microwave vibration measurement system to cover the bridge structure to be tested, and controlling the repeated transmission of linear frequency modulation continuous wave microwave signals while collecting multi-channel intermediate frequency baseband signal; then according to the multi-channel intermediate frequency baseband signal, the joint positioning of the distance and angle dimensions of the measured bridge structure's full-field measurement points is carried out, and the deformation and vibration time domain information of multiple measurement points is extracted; according to the static load or dynamic Under load test conditions, the deformation information of multiple measuring points is used to verify whether the bridge structure meets the requirements of the design and safety specifications. Rapid testing and evaluation of the structural performance and safety of the bridge under test based on the dynamic parameters. The invention performs distance and angle joint dimension positioning and measurement on the bridge structure, and realizes rapid testing and evaluation of structural performance and safety.

Description

technical field [0001] The present invention relates to a technology in the field of civil engineering testing, in particular to a non-contact bridge structure performance and safety rapid testing and evaluation system and method. Background technique [0002] Vibration testing is currently the main method in the field of structural health monitoring. It monitors the vibration information of bridge structures generated by natural excitations such as the environment and vehicles, and then realizes the extraction of vibration modal parameters and the detection of structural damage. The current mainstream bridge vibration monitoring method is to arrange contact sensors such as piezoelectric sensors and acceleration sensors on the bridge deck, but this vibration test method often needs to arrange sensors on the entire bridge deck, resulting in too many sensors The connection wires between the bridges are too long, the network distribution is complicated, etc., and it requires a ...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that the number of sensors in the existing contact measurement method is large, the layout of the circuit is complex and it is difficult to realize the synchronous measurement of multiple measuring points in the whole field of the bridge in the non-contact sensor, and proposes a non-contact bridge structure performance and safety fast The test and evaluation system and method, using the single-transmit-multi-receive or multiple-transmit-multi-receive microwave radar mode, transfers the vibration displacement information of the target to be measured from the distance dimension to the angle dimension, and at the same time carries out joint dimensional positioning of the distance dimension and the angle dimension for the bridge structure , extract the vibration displacement time domain information of each positioning measuring point, and then extract the dynamic and static deflection and modal parameters of the bridge, and perform rapid testing and evaluation of structural performance and safety

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