Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (4): 1094-1104.doi: 10.13229/j.cnki.jdxbgxb.20210849

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Experiment on cracks in reinforced concrete beams based on digital image correlation technology

Er-gang XIONG(),Zhong-wen GONG,Jia-ming LUO,Tuan-jie FAN   

  1. School of Civil Engineering，Chang′an University，Xi′an 710061，China
  • Received:2021-08-30 Online:2023-04-01 Published:2023-04-20

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Abstract:

In order to investigate the influence of shear span ratio on the initiation and propagation of cracks in reinforced concrete beam， according to Code for Design of Concrete Structures， a group of reinforced concrete beams with shear span ratios of 4.0， 3.0， 2.5 and 2.0 were designed. Through the digital image correlation （Digital image correlation， DIC） technology， the whole process of crack initiation and evolution was captured for the reinforced concrete beam components under the monotonic loading. The distribution and width of the cracks in RC beams were reproduced in different loading levels. The test results are compared with the calculated values by the use of major design codes. The results show that the DIC technology is a realistic test observation method； the distribution of cracks has a very important relationship with the shear span ratio， and the larger cracks of the test beam are mainly distributed in the pure bending section. At the same time， the position and width of the cracks are almost evenly distributed within the pure bending section. This is basically consistent with the crack calculation formula given in major design codes.

Key words: structural engineering, DIC technology, reinforced concrete beam, crack, shear-span ratio

CLC Number: 

  • TU375.1

Fig.1

Beam reinforcement diagram"

Fig.2

DIC diagram"

Fig.3

Loading device diagram"

Fig.4

Comparison of deflection measurements undervarious loads"

Fig.5

Load-deflection curve comparison"

Fig.6

Crack development observed by surface strain"

Table 1

First crack， length and number cracks measured with DIC technology"

试件 编号开裂荷载/kN裂缝长度1/mm裂缝数量2破坏形式
A55391.5625弯曲破坏
B55333.7524弯曲破坏
C85369.6927弯曲破坏
D90348.8021弯曲破坏

Fig.7

Schematic diagram of crack width extraction"

Fig.8

Srack position and width information"

Fig.9

Relationship between test beam bending momentand crack width"

Table 2

Experimental and theoretical moments at the first cracking"

试件试验值/kN规范计算值/kN试验值/理论值
ACIEurocode2CSAGBACIEurocode2CSAGB
A5539.6134.5819.1733.521.381.592.861.64
B5552.8246.1025.5644.701.041.192.151.23
C8563.3955.3230.6753.641.341.532.771.58
D9079.2369.1638.3467.051.131.302.341.34

Table 3

Comparison of experimental and theoretical crack spacing"

试件试验值/mm规范计算值/mm试验值/理论值
EC2?92EC2?04MC?90GB?10EC2?92EC2?04MC?90GB?10
A151.8084.60164.2396.13128.911.790.921.571.17
B178.752.111.081.851.38
C193.372.281.172.011.50
D155.691.840.941.611.20

Fig.10

Crack width： comparison of test results with code′s models"

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