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Fractalanalysis method for crack propagation path of concretemember

A technology of crack propagation and analysis method, which is applied in the field of health monitoring of urban building structure engineering, and can solve problems such as inaccurate geometric shape and irregular discrete features of expansion

Inactive Publication Date: 2016-08-31
QINGDAO TECHNOLOGICAL UNIVERSITY
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Problems solved by technology

[0004] Aiming at the problem of inaccurate quantitative evaluation of irregular discrete features such as geometric shape and expansion of cracks in the prior art, the present invention aims to provide an accurate and effective method for concrete damage estimation and damage shape evaluation

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  • Fractalanalysis method for crack propagation path of concretemember
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  • Fractalanalysis method for crack propagation path of concretemember

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Embodiment Construction

[0038] The fractal analysis method of the crack propagation path of the concrete member described in the present invention will be further described through the examples and the accompanying drawings.

[0039] In this embodiment, the section of the concrete beam is taken as b=248mm, the height h=296mm, the total length of the beam is 2700mm, and the concrete strength is C30, so as to realize the analysis and prediction of the growth process of the concrete beam crack, the specific implementation steps are as follows:

[0040] (1) Calculate the actual cracking load value of the concrete beam to get the cracking value F=41kN, where y t =148mm, I g =5.36×10 -4 m 4 , f r =3.4×10 3 N / m 2 ,M r = 0.3F. Carry out graded loading according to the calculated cracking load as shown in Table 1. The initial loading increases by 5kN each time. When the loading reaches 35kN, the difference between the cracking load and the cracking load is close to 5kN. At this time, reduce the load gr...

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Abstract

The invention relates to a fractalanalysis method for a crack propagation path ofa concretemember. The method comprises the following steps: (1) calculating an actual cracking loadvalue of the concrete member, performing stepwise loading accordingly, and lowering the increasing speed of the load when an external load value is close to a cracking load; (2) acquiring crack image information of the surface of the concrete member during each loading; (3) sharpening images, selecting a main crack, and correspondingly finding main crack images during each step of loading; (4) performing refinement segmentation processing according to a coating defined box-counting method, calculatingbasic parameter N(r) and r of the main crack during each loading, and performing regression with a computer to solve a fractal dimension value D; (5)establishing coordinates ona processedslit image, defining certain interpolation data points,inputting the interpolation data points into the computer to simulate fractal interpolation calculation in order to obtain length and morphological features of a slit of the concrete member, simulating prediction and saving a simulation result. By adopting the method, the failure law of the concrete member can be acquired more accurately.

Description

technical field [0001] The invention belongs to the technical field of health monitoring of urban building structure engineering, and relates to a new analysis method for crack propagation paths of concrete structures, in particular to a software simulation test analysis method for crack propagation paths of concrete structures based on fractal geometry theory. Background technique [0002] Concrete is a brittle material that is prone to cracks due to molding defects, temperature changes, temperature stress, external loads, and chemical corrosion. Cracks seriously affect the strength and durability of concrete components. Due to the generation of cracks, the corrosion of steel bars will be aggravated and the bearing capacity of reinforced concrete components will be reduced. The research on the crack propagation path of reinforced concrete members is of practical significance in real engineering to explore the influence of damage on the durability of members and to establish...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N21/88G01B21/02G01N33/38G06F17/50
CPCG01B21/02G01N3/08G01N21/8851G01N33/383G01N2021/8874G01N2021/888G01N2021/8887G06F30/13
Inventor 于广明孙叶冰高丽燕袁长丰徐翀
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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