Numerical simulation study on bond-slip performance between FRP bar and cement slurry

Abstract

Abstract: In this paper, the bond-slip performance between FRP bar and cement slurry and the influence factors on the bond performance were studied by numerical simulation and indoor test. Cohesive unit the finite element software was used to simulate the interface bond slip between FRP bar and cement slurry, and the damage and destruction behavior of cement slurry was simulated by the concrete plastic damage model. The influence factors such as FRP bar type, diameter, and length on interface bond behavior, bond stress distribution, and failure mechanism was studied through controlled variable method. The results show that the bond performance of different types of FRP bars varies greatly. Increasing the bond length and diameter of FRP bar can improve the ultimate bearing capacity. During the loading process, the axial force of FRP bar is mainly distributed at the loading end. As the load increases, the increase in axial force of the FRP bar near the loading end is greater than that at the end of the bonding section. When the pull-out load reaches its peak, the interface bond unit is damaged, and the bond strength continuously decreases. As the bond slip curve enters the descending stage, the interface bond strength gradually fails and the specimen is completely destroyed.

Key words: FRP bar, cement slurry, bond property, finite element simulation

CLC Number:

TU47

WANG Zheng-zhen, LIANG Jin-tian, DAI Guo-liang, ZHOU Yong JIN Gao-ming, WANG Jin-ke. Numerical simulation study on bond-slip performance between FRP bar and cement slurry[J]. Journal of Lanzhou University of Technology, 2024, 50(4): 135-141.

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