Non-contact type bridge structure performance and safety rapid test and evaluation system and method

Abstract

The invention discloses a non-contact type bridge structure performance and safety rapid test and evaluation system and method. The non-contact type bridge structure performance and safety rapid test and evaluation method comprises the steps of: enabling a transmitting beam of a microwave vibration measurement system to cover a to-be-tested bridge structure, controlling the repeated transmission of a linear frequency modulation continuous wave microwave signal, and collecting a multi-channel intermediate frequency baseband signal; then carrying out combined positioning of the distance and angle dimensions of whole-field measurement points of the tested bridge structure according to the multi-channel intermediate-frequency baseband signal, and extracting to obtain the deformation and vibration time domain information of the multiple measurement points; verifying whether a bridge structure meets design and safety specification requirements or not according to multi-measuring-point deformation information of the tested bridge structure under the static load or dynamic load test working condition, and identifying modal parameters according to deformation and vibration information of full-field measuring points of the tested bridge structure under excitation; and according to the deformation quantity and the modal parameters, carrying out rapid test and evaluation on the performance and safety of the tested bridge structure. The non-contact type bridge structure performance and safety rapid test and evaluation system and the method are used for carrying out distance and angle combined dimension positioning and measurement on the bridge structure, and realize 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 ...

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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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