Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (2): 620-630.doi: 10.13229/j.cnki.jdxbgxb20191191

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Damage of reinforced concrete shear beams based on acoustic emission and fractal

Jiang YU(),Zhi-hao ZHAO,Yong-jun QIN   

  1. School of Civil Engineering and Architecture，Xinjiang University，Urumqi 830047，China
  • Received:2019-12-27 Online:2021-03-01 Published:2021-02-09

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Abstract:

Through the shear failure test of five reinforced concrete beams with different shear span ratio and different hoop ratio， the damage evolution process of concrete beams was studied by using acoustic emission detection technology and fractal theory. Based on the parameters of acoustic emission signal energy， ringing count and crack fractal characteristics， the evolution of shear damage of concrete beams is quantitatively analyzed. Test results show that the acoustic emission ringing counts and energy with the damage degree are divided into three stages. The accumulate ringing count， energy and the fractal dimension of crack increase with load level. The growth rate of the crack increases with the shear span ratio， while decreases with increasing stirrup ratio， proving that the acoustic emission parameters can be used as a damage degree evaluation index. By establishing the correlation between the cumulative acoustic emission events and the load level， the damage evolution model of the shear beam is derived， and the correlation between the damage degree and the fractal dimension of the beam surface crack is established.

Key words: structural engineering, concrete beams, damage, acoustic emission, fractal, shear span ratio, stirrup ratio

CLC Number: 

  • TU375.1

Fig.1

Principles of acoustic emission detection"

Fig.2

Acoustic emission signal parameters"

Fig.3

Principle of box counting"

Fig.4

Size and reinforcement diagram of the test"

Table 1

Parameters of test beam"

试验梁参数试验梁编号
B1B2B3B4B5
剪跨比1.52.02.52.52.5
加载跨度/mm338450563563563
箍筋?8@150?8@150?8@150?8@200?6@150
配箍率/%0.450.450.450.360.25

Fig.5

Loading and monitoring method"

Fig.6

Damage status of test beam at each stage"

Fig.7

AE damage and crack location of specimen"

Fig.8

Relationships of ringing count, cumulative ringing count and relative load"

Fig.9

Relationship of Energy,cumulative energy andrelative load"

Fig.10

Relationship of fractal dimension,cumulative ringing count and load"

Fig.11

Cumulative energy-relative load fitting curve"

Table 2

Fitting results of beam damage curve"

试件编号abcR2
B1267 2111.343 74-43 8140.902 7
B2511 6171.530 14114 5500.973 1
B3157 0542.428 85-60 1330.960 9
B4198 0702.653 1111 5930.992 5
B592 3683.305 93101 5150.966 8

Fig.12

Experimental beam damage evolution curve"

Fig.13

Relationship of damage variables and fractal dimension"

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