Structural deformation monitoring method based on contour line image stacking difference analysis

Abstract

The invention discloses a structural deformation monitoring method based on contour line image stacking difference analysis. The complete image of a structural body is formed by image splicing, and the contour line image of the structural body is acquired by utilizing the complete image; the contour line images acquired in different periods are stacked so that a stacking difference image is formed; and thus relative deformation data of the structural body measured in different periods are acquired. The structural deformation monitoring method is used for detecting and evaluating the safety of a bridge and other structural bodies so that data acquisition time is short, and the structural deformation monitoring method has the advantages of being high in working efficiency and low in cost and can realize high-frequency wide-range bridge safety monitoring and enhance the safety early warning capacity of the bridge and other structural bodies. The structural deformation monitoring method is different from the existing point monitoring method having incompleteness and used for monitoring the bridge and other structural bodies so that all the contour line data of the whole structural body can be rapidly acquired and structural deformation of parts which can be photographed in the images can be acquired through the stacking difference image, and the structural deformation monitoring method is used for evaluating the safety of the structural body and truly and objectively avoiding the influence of artificial subjective factors to the greatest extent.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a structural deformation monitoring method based on contour line image overlap analysis. Background technique [0002] In the field of civil and structural engineering, especially structures with a certain life span such as bridges, it is necessary to take effective monitoring and management measures to ensure that these structures prevent major safety accidents during their use. [0003] In the prior art, the inspection of relatively important structures such as bridges usually refers to the close observation and testing of the main structure at the attention position with the help of scaffolding or special equipment, which usually requires high costs and it is difficult to quantify the changes in the overall condition of the structure Data will also affect the normal operation and use of structures, such as affecting the normal passage of vehicles on bridges. Another relativel...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the inspection of relatively important structures such as bridges usually refers to the close observation and testing of the main structure at the attention position with the help of scaffolding or special equipment, which usually requires high costs and it is difficult to quantify the changes in the overall condition of the structure Data will also affect the normal operation and use of structures, such as affecting the normal passage of vehicles on bridges

Another relatively simple and effective monitoring method is to use fixed-point photography to obtain the changes of characteristic speckle patterns on the structure at different times or under different working conditions to monitor the deformation of key points or local areas. This method is based on fixed photography and can On the basis of obtaining clear images, it is generally only suitable for deformation monitoring of small indoor structures or short-term deformation monitoring of designated points of large outdoor structures, and cannot be used for monitoring the geometric changes of large-scale civil and architectural structures as a whole and their components

So far, it is not possible to obtain holographic data of the geometric shape changes of the whole and component parts of large-scale civil and engineering structures economically and conveniently, which makes the evaluation of the long-term safety of the overall and component structures of large-scale civil and engineering buildings lose important basic data

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