Steel fiber concrete model construction method based on CT scanning

Abstract

The invention discloses a steel fiber concrete model construction method based on CT scanning, and the method specifically comprises the following steps: firstly, carrying out layer-by-layer scanning of a steel fiber concrete sample through medical CT or industrial CT, and obtaining N steel fiber concrete slice CT scanning structure images; carrying out four-valued processing on the image, obtaining an integral two-dimensional segmented structure image through an annular partitioning method and a region growing method, and carrying out layer-by-layer superposition on each integral two-dimensional segmented structure image to obtain an integral three-dimensional CT scanning structure image; and finally, carrying out three-dimensional reconstruction by adopting a three-dimensional visualization technology to obtain a steel fiber reinforced concrete CT scanning digital sample, importing the steel fiber reinforced concrete CT scanning digital sample into finite element software, and carrying out grid division and optimization on the steel fiber reinforced concrete CT scanning digital sample to obtain a steel fiber reinforced concrete CT scanning numerical analysis model. The internal structure of the steel fiber reinforced concrete material is visually observed through three-dimensional reconstruction, and three-dimensional visualization of nondestructive testing of the steel fiber reinforced concrete is achieved.

Description

technical field [0001] The invention relates to the technical field of concrete CT image processing, in particular to a method for constructing a steel fiber concrete model based on CT scanning. Background technique [0002] Concrete is one of the most widely used materials in building construction. It has obvious inhomogeneity. It is difficult to accurately reveal its essential characteristics by exploring the static and dynamic failure mechanism of concrete under macroscopic conditions. Only by conducting a comprehensive study from the macroscopic to the microscopic, can we correctly understand the law of its destruction. In fact, there are many factors that affect the mechanical properties of concrete. In addition to the test conditions, there are also concrete itself (such as aggregate particle size, size, distribution, properties, and content), which directly affect the strength characteristics of concrete. These different factors To some extent, it determines the comp...

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Problems solved by technology

Usually, the traditional CT image data analysis of concrete failure law is based on the direct image analysis method, that is, the structural change of concrete after stress is analyzed through images. However, this method cannot accurately judge whether it exists directly from the image. According to the scanning principle of the machine, the obtained concrete CT image is only a cross-sectional image, and the image analysis cannot be carried out directly after the concrete body column is stressed. Restoration work requiring stereoscopic reconstruction of CT images of concrete

However, there are very few related studies on obtaining the real meso-structural model of concrete through the results of three-dimensional reconstruction.

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