基于数字图像相关技术的钢筋混凝土梁裂缝试验

doi:10.13229/j.cnki.jdxbgxb.20210849

摘要/Abstract

摘要：

为探讨剪跨比对钢筋混凝土梁裂缝萌发和发展的影响，根据我国规范，设计了一组剪跨比分别为4.0、3.0、2.5、2.0的钢筋混凝土梁，利用数字图像相关（DIC）技术捕捉钢筋混凝土梁构件在荷载作用下裂缝萌发及发展的全过程，重现了钢筋混凝土梁在各级荷载作用下裂缝的分布及其宽度，并将试验结果与各国规范公式的计算结果进行对比。结果表明：DIC技术是一种较好的试验观测手段；裂缝的分布与剪跨比有着十分重要的联系，试验梁的宽度较大裂缝主要分布在纯弯段；同时，在纯弯段范围内裂缝的位置及宽度近乎均匀分布。这与各国混凝土结构设计规范中裂缝计算公式的建立依据基本一致。

关键词: 结构工程, DIC技术, 钢筋混凝土梁, 裂缝, 剪跨比

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

中图分类号:

TU375.1

熊二刚,巩忠文,罗佳明,范团结. 基于数字图像相关技术的钢筋混凝土梁裂缝试验[J]. 吉林大学学报(工学版), 2023, 53(4): 1094-1104.

Er-gang XIONG,Zhong-wen GONG,Jia-ming LUO,Tuan-jie FAN. Experiment on cracks in reinforced concrete beams based on digital image correlation technology[J]. Journal of Jilin University(Engineering and Technology Edition), 2023, 53(4): 1094-1104.

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参考文献 20

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试件编号	开裂荷载/kN	裂缝长度¹/mm	裂缝数量²	破坏形式
A	55	391.56	25	弯曲破坏
B	55	333.75	24	弯曲破坏
C	85	369.69	27	弯曲破坏
D	90	348.80	21	弯曲破坏

试件	试验值/kN	规范计算值/kN				试验值/理论值
试件	试验值/kN	ACI	Eurocode2	CSA	GB	ACI	Eurocode2	CSA	GB
A	55	39.61	34.58	19.17	33.52	1.38	1.59	2.86	1.64
B	55	52.82	46.10	25.56	44.70	1.04	1.19	2.15	1.23
C	85	63.39	55.32	30.67	53.64	1.34	1.53	2.77	1.58
D	90	79.23	69.16	38.34	67.05	1.13	1.30	2.34	1.34

试件	试验值/mm	规范计算值/mm				试验值/理论值
试件	试验值/mm	EC2?92	EC2?04	MC?90	GB?10	EC2?92	EC2?04	MC?90	GB?10
A	151.80	84.60	164.23	96.13	128.91	1.79	0.92	1.57	1.17
B	178.75					2.11	1.08	1.85	1.38
C	193.37					2.28	1.17	2.01	1.50
D	155.69					1.84	0.94	1.61	1.20