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A Non-contact Deformation Measurement Method of Bridge Based on Feature Point Tracking

A measurement method, non-contact technology, applied in image analysis, instrumentation, calculation, etc., can solve the problems of cumbersome layout and acquisition system, achieve the effect of enriching the quantity, improving the accuracy rate, and eliminating interference points

Active Publication Date: 2021-09-28
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the shortcomings and deficiencies in the current technology, the purpose of the present invention is to provide a bridge non-contact deformation measurement method based on feature point tracking. The present invention overcomes the cumbersome defects of traditional contact bridge deflection measurement equipment arrangement and acquisition system, Compared with existing optical measurement methods, it does not need to paste characteristic targets on the structure but directly utilizes structural features, truly realizing non-contact

Method used

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  • A Non-contact Deformation Measurement Method of Bridge Based on Feature Point Tracking
  • A Non-contact Deformation Measurement Method of Bridge Based on Feature Point Tracking
  • A Non-contact Deformation Measurement Method of Bridge Based on Feature Point Tracking

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Embodiment 1

[0037] In the following, a typical bridge load test case is used to illustrate the implementation steps of the proposed rapid bridge deformation measurement method based on feature point tracking. First of all, let me introduce the static load test conditions measured by optical measurement on the same day. Six trucks with a single vehicle weight of 34 tons are used for loading. After the bridge deck is empty, the trucks are ready at the bridge head and stop at each eighth test point, such as image 3 As shown in , this optical measurement needs to monitor the deflection near the green measuring point. Each octant measuring point should stop for at least 10 minutes to ensure that the structure is completely deformed. The traditional measuring equipment used to measure the deformation of each octant measuring point on that day includes a level and an inclinometer. The following are the implementation steps when photometry is involved:

[0038] Step 1: Determine the layout of ...

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Abstract

The invention discloses a bridge non-contact deformation measurement method based on feature point tracking. The method of the present invention focuses on the immobile structure with negligible deformation in the distance through the camera erected on the bridge measuring point, collects a series of images of the immobile structure before and after the bridge is loaded, and uses the improved feature point matching algorithm SURF-BRISK to track the features The sub-pixel coordinates of the point in the image are obtained to obtain the sub-pixel displacement at the bridge measuring point, and then, through the calibrated scaling factor, the pixel displacement is converted into the actual physical displacement. The present invention overcomes the complex process of installation of traditional displacement measurement means such as displacement meter inclinometer, and also overcomes the traditional image measurement method that needs to paste a pre-designed special target surface on the surface of the structure, and furthermore, the existing feature points Matching screening strategy improvements to improve matching accuracy and work efficiency. The method has the characteristics of non-contact, less preparation process, and convenient positioning of measuring points, and has wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of structural health monitoring, and in particular relates to a non-contact deformation measurement method for bridges based on feature point tracking. Background technique [0002] Displacement is one of the most critical basic parameters in bridge structure design and performance evaluation. It can directly reflect the basic performance and state of the structure. Therefore, the displacement of bridge structures has always been the focus of engineers and researchers. Existing displacement measurement equipment is mainly divided into two types: contact type and non-contact type. Contact displacement measurement equipment includes displacement meter inclinometer, level gauge, long gauge strain sensor, etc. However, there are various problems in the existing contact measurement equipment, and it is not fast and convenient enough in practical engineering applications. For example: the displacement meter needs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/73G06T7/33
CPCG06T7/33G06T7/73
Inventor 张建于姗姗朱程鹏
Owner SOUTHEAST UNIV
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