Dynamic behavior of CFRP strengthen RC beams based on digital image correlation technology

被引：9
作者：
Lu, Juan [1 ]
Zhang, Yafang [1 ]
Duan, Libin [1 ]
Huo, Yongjie [1 ]
Liu, Hao [2 ]
机构：
[1] Guangzhou Univ, Sch Civil Engn, Guangzhou 510006, Peoples R China
[2] Shenzhen Municipal Design Res Inst Co Ltd, Shenzhen 518029, Peoples R China
来源：
ENGINEERING FRACTURE MECHANICS | 2022年 / 271卷
基金：
中国国家自然科学基金;
关键词：
Reinforced concrete beam; CFRP; Impact-resistance ability; Digital image correlation; Crack propagation behavior; FIBER-REINFORCED POLYMER; MECHANICAL-PROPERTIES; FRACTURE-BEHAVIOR; CRACK-PROPAGATION; CONCRETE BEAMS; PERFORMANCE; CRITERION; THICKNESS; COLUMNS; DESIGN;
D O I：
10.1016/j.engfracmech.2022.108597
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
In this paper, impact behaviors of reinforced concrete (RC) beam and carbon fiber reinforced plastic (CFRP) strengthen RC beam (CFRP-RC beam), including the damage process, failure pattern, impact force peak value and peak deflection were investigated by means of using threepoint bending tests with a drop-hammer impact device. A high-speed camera combined with digital image correlation (DIC) method was used to capture the initiation and propagation process of impact multiple-cracks and to record the cracking strain. The results showed that the changes of hammer impact height and bonded CFRP on beams had different effects on dynamic response of beams, and they also caused change of failure pattern of beams. Introduce of CFRP can significantly reduce the crack widths and mid-span deflections of beams and improve the impact resistance of beams. In addition, the crack velocity in RC beam was inhibited effectively by CFRP, however, the inhibitory effect declined as impact velocity increased.
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页数：20
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