Bridge beam bottom internal nondestructive testing method based on local vibration response and system thereof

Abstract

The invention discloses a bridge beam bottom internal nondestructive testing method based on local vibration response, which comprises the following steps of: hovering an unmanned aerial vehicle at the bottom of a target bridge, and knocking a beam bottom subarea by using an impact hammer to apply impact force; using a vehicle-mounted camera, taking the impact point as a video capture center, performing real-time video recording based on oblique photography on the beam bottom area, wherein the recording time is 2-3 S, and obtaining a vibration feedback video; performing motion amplification processing on the vibration feedback video; performing corresponding processing analysis on the video to obtain a corresponding vibration frequency response; repeating to obtain the vibration frequency of the tested area on the bottom surface of the whole bridge, judging whether the vibration frequency is suddenly changed beyond a set range or not, and if so, displaying or alarming. The vibration frequency is obtained through cooperation of the unmanned aerial vehicle and video shooting and analysis, the detection process is simpler, and the detection efficiency is higher. The nondestructive testing system for the interior of the bridge bottom based on the local vibration response can achieve the same technical effect.

Description

technical field [0001] The invention relates to the field of bridge detection, and further relates to a method and system for non-destructive detection of the interior of bridge girder bottoms based on local vibration responses. Background technique [0002] During the operation of the bridge structure, it will be affected by the long-term harsh environment and the continuous vehicle load, which will cause the material performance to degrade, which will lead to the damage of the bridge structure, which will affect the safe use of the structure, and lead to collapse and casualties. Regular inspection of the bridge structure, timely detection of structural damage, and evaluation of structural safety performance can avoid many potential safety hazards, which has guiding significance for the operation and maintenance of bridges. [0003] At this stage, there are mainly two methods for internal damage detection of bridge girder bottoms: the first method requires inspectors to bui...

AI Technical Summary

Problems solved by technology

[0003] At this stage, there are mainly two methods for internal damage detection of bridge girder bottoms: the first method requires inspectors to build a fixed track maintenance truss in advance, and then use impact hammers or other equipment (ultrasonic, infrared, radar, etc.) for internal damage detection. This method needs to permanently and safely fix the track and special truss hanging basket at the bottom of the beam in advance, which is costly; the running speed of the hanging basket is slow and the detection efficiency is low; the inspection personnel need to move large-scale equipment on the ground into the hanging basket, which is difficult to transport and complicated to operate

[0004] The second method is to send inspection personnel and equipment to the bottom of the bridge for observation through the hanging basket or truss device of the bridge inspection vehicle. This method needs to close the traffic in advance, which affects the normal passage of vehicles; Poor flexibility; limited by the heavy weight of the inspection vehicle itself, bridges with serious damage cannot be inspected; the inspection process requires professionals to enter the lower truss, which makes it difficult to guarantee the safety of inspectors

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