Experimental study on the bond shear stress-slip relationship of CFRP-timber interface

doi:10.19936/j.cnki.2096-8000.20221128.002

Abstract

Abstract: In order to study the mechanical properties of carbon fiber reinforced polymer (CFRP) and timber bonding interface, through the shear test of 30 (6 groups) CFRP-timber double-sided bonding specimens, the development law of CFRP strain and interface bonding shear stress was analyzed, to obtain the bonding shear stress-slip relationship curve, and explore the effect of CFRP paste length and width on the interface bonding performance. Through regression analysis of the test results, the CFRP-timber interface bonding shear stress-slip constitutive relationship model is proposed. The test results show that the specimens mainly undergo shear failure and peeling failure, and there is no obvious sign before failure, which is brittle failure. The bonding width of CFRP has a significant influence on the ultimate bearing capacity of the interface. After a certain length, the bonding length has the limit of the interface. The bearing capacity is not obvious; the polynomial-lognormal function constitutive model controlled by two parameters proposed in the article can better fit the test results; it can provide a theoretical basis and practical reference for CFRP-reinforced wooden structures.

Key words: CFRP, timber, double shear test, bonding performance, constitutive model

CLC Number:

TB332

LEI Yun-xiao, LIU Sheng-wei, ZHAO Jian-chang, ZHANG Jia-wei, BAI Cheng-yu. Experimental study on the bond shear stress-slip relationship of CFRP-timber interface[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(11): 15-19.

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