Quantitative concrete damage measuring method
A quantitative measurement, concrete technology, applied in measurement devices, optical testing of flaws/defects, material analysis by optical means, etc., can solve problems such as failure to consider concrete damage, inability to apply in engineering fields, and inability to accurately describe the deformation of concrete materials. , to achieve the effect of strong applicability
Active Publication Date: 2018-10-30
HEBEI UNIV OF TECH
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Problems solved by technology
[0004] Li Qingbin et al. (Li Qingbin, Zhang Chuhan. Dynamic and static damage fracture analysis of concrete I-type cracks [J]. Civil Engineering Journal, 1993, 12(6): 20-27.) proposed the coupling analysis of damage and fracture theory for the first time, using It is used to determine the working stability of concrete, but this research is only carried out for infinite slabs and cannot be applied to the actual engineering field
Dong Wei et al. (Dong W, Yang D, Zhou X, et al. Experimental and numerical investigations onfracture process zone of rock–concrete interface[J]. Fatigue&Fracture of Engineering Materials&Structures, 2016, 40.) conducted a concrete three-point bending beam fracture test At the same time, combined with the digital image method, the characteristics of the fracture process zone of different concrete specimens were studied, but this study was carried out only from the strength criterion, and the ultimate tensile strain of the concrete material was used as the criterion for judging the damage, without considering The damage of concrete before the ultimate tensile strain, so it cannot accurately describe the real deformation of the concrete material
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Embodiment 1
[0067] The experiment of this example was carried out in the Civil Engineering Technology Research Center of Hebei Province. The test object was the concrete wedged splitting specimen. The purpose of the test was to obtain the full-field damage factor along the crack propagation direction of the wedged splitting specimen during the loading process. information.
[0068] Fig. 4 (a) is the actual picture of the device used in the measurement method of this embodiment, wherein I is an electro-hydraulic servo pressure testing machine, which is used to provide the pressure required for the test, so that the wedged splitting test piece III produces splitting damage, and II is The acquisition camera is used to take pictures of the whole process of the test. Figure 4(b) shows the concrete wedge splitting test piece. A prefabricated crack was opened along the upper part of the middle part of the test piece during fabrication. Spots, the image analysis area has been marked in Figur...
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The invention relates to a quantitative concrete damage measuring method which comprises the following steps: according to related experiment parameter information such as a camera pixel and a lens focal length, acquiring a recommended scattered spot size change range, calculating whole-field deformation information of an analysis area, calculating whole-field damage factor information, acquiringa distribution cloud picture of a whole-field damage factor, judging damage situations in all positions in a measured object analysis area according to the cloud picture, and furthermore evaluating working stability of a concrete structure.
Description
technical field [0001] The invention belongs to the technical field of digital image processing, in particular to a method for quantitatively measuring concrete damage. Background technique [0002] Concrete is widely used in practical projects such as industrial and civil buildings, roads and bridges, and dams. It is the most used material in the field of civil engineering, which has greatly promoted the construction of modern cities. How to make an accurate and reasonable evaluation of the working stability of the concrete structure according to the damage characteristics of the concrete material itself, and repair and reinforce it in time, so as to ensure that the structure is in a normal working state and protect people's lives and property from loss, has very important practical significance. [0003] The traditional strength failure criterion holds that: when the concrete material reaches its ultimate tensile or compressive strength, it will fail. As a multi-phase comp...
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IPC IPC(8): G01N21/95
CPCG01N21/95G01N2021/8887G01N2021/8874Y02W30/91
Inventor 卿龙邦曹国瑞丁绍强
Owner HEBEI UNIV OF TECH