Study on Acoustic Emission Performance of Concrete Short Columns Strengthened with CFRP Strips and Concrete Canvas
WANG Jun1,2,3,†, XIANG Zehui1,2,3,†, NIU Jiangang1,2,3,4,*, XU Wenming5
1 College of Civil Engineering,Inner Mongolia University of Science and Technology, Baotou 014000, Inner Mongolia, China 2 Key Laboratory of Civil Engineering Safety and Durability of Inner Mongolia Autonomous Region, Baotou 014000, Inner Mongolia, China 3 Inner Mongolia Autonomous Region Building Structure Disaster Prevention and Mitigation Engineering Technology Research Center , Baotou 014000, Inner Mongolia, China 4 Inner Mongolia Vocational and Technical College of Architecture, Hohhot 010000, China 5 College of Civil Engineering, Chongqing University, Chongqing 400000, China
Abstract: In order to study the mechanical properties and failure mechanism of concrete short columns strengthened with CFRP strips and concrete canvas, uniaxial compression-acoustic emission tests were carried out, and the acoustic emission process of loading damage and failure caused by CFRP strip width, CFRP layers and section forms were analyzed. The results showed that the strength grade of concrete and steel bar had little effect on the bearing capacity of the joint strengthened specimen, and increasing the width of the CFRP strip could improve the strength and deformability of the joint strengthened specimen, and the greater the AE signal strength released during the loading process. According to the correlation between the characteristic parameters of acoustic emission and the time stress curve, the internal failure of the joint strengthened specimen was divided into three stages: the initiation stage of the internal microcrack, the stable development stage of the internal crack and the formation and failure stage of the internal macroscopic crack. The evolution of the internal damage of the joint strengthened specimen could be effectively reflected by the b-value analysis method, and the overall decrease of b-value with the increasing of load indicates that the internal cracking degree of the specimen was increasing.
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2024, Vol. 38 
