|Table of Contents|

Study on flexural performance of recycled concrete beams with waste fiber based on fractal theory(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年04期
Page:
52-59
Research Field:
建筑结构
Publishing date:

Info

Title:
Study on flexural performance of recycled concrete beams with waste fiber based on fractal theory
Author(s):
ZHOU Jinghai;  WU Xiaoxin; YU Hanglin;  ZHAO Qi;  ZHANG Guangqi
(School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, Liaoning, China)
Keywords:
recycled concrete with waste fiber;  simply supported beam;  flexural performance;  fractal dimension
PACS:
TU528
DOI:
10.19815/j.jace.2021.09122
Abstract:
In order to quantitatively analyze the flexural cracking and crack development characteristics of recycled concrete beams with waste fiber under different recycled aggregate replacement rates and waste fiber content, the evolution process of flexural cracking of reinforced concrete beams with different recycled aggregate replacement rates and waste fiber volume content was studied based on fractal theory. The box counting method was used to analyze the distribution characteristics of cracks on the surface of recycled concrete beams with waste fiber, and then the effects of the replacement rate of recycled aggregate and the amount of waste fiber on the flexural performance of the specimens were studied. The results show that the fractal dimension of crack distribution on the surface of recycled concrete beams with waste fiber is between 0.9 and 1.25, and the increase of load and midspan deflection has a significant impact on the change of fractal dimension. With the increase of waste fiber content, the fractal dimension tends to decrease first and then increase. In the ultimate state, the fractal dimension increases with the increase of recycled aggregate content. Fractal dimension can describe the development process of cracks, and the fractal dimension of FRC-0.12-50 is closest to NC-0-0. The smaller the fractal dimension, the better the flexural performance of the beam. The fractal dimension of the crack on the beam surface can be used as an indicator to measure the flexural performance of the beam. Using fractal dimension to analyze the flexural performance of specimens can be an effective technical means for studying and evaluating the flexural performance of beams.

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Last Update: 2023-07-01