Abstract
The objective of this paper was to explore the bond–slip relationship between carbon fiber-reinforced polymer (CFRP) sheets and concrete under cyclic loading through experimental and analytical approaches. Modified beam tests were performed in order to gain insight into the bond–slip relationship under static and cyclic loading. The test variables are the CFRP-to-concrete width ratio, and the bond length of the CFRP sheets. An analysis of the test results in this paper and existing test results indicated that the slope of the ascending segment of the bond–slip curve decreased with an increase in the number of load cycles, but the slip corresponding to the maximum shear stress was almost invariable as the number of load cycles increased. In addition, the rate of reduction in the slope of the ascending range of the bond–slip curve during cyclic loading decreased as the concrete strength increased, and increased as the load level or CFRP-to-concrete width ratio enhanced. However, these were not affected by variations in bond length if the residual bond length was longer than the effective bond length. A bilinear bond–slip model for CFRP sheets that are externally bonded to concrete under cyclic loading, which considered the effects of the cyclic load level, concrete strength, and CFRP-to-concrete ratio, was developed based on the existing static bond–slip model. The accuracy of this proposed model was verified by a comparison between this proposed model and test results.
Highlights
During the last few decades, significant progress has been made in the promotion and application of carbon fiber-reinforced polymer (CFRP) composites in retrofitting and strengthening civil constructions due to their advantages, which are namely, light weight, high strength, excellent fatigue resistance, and a simple application method [1]
For reinforced concrete (RC) structures, externally bonded CFRP sheets/plates have been widely used as a valid reinforcement method [2]
The failure modes of specimens in groups have been presented the CFRP–concrete interface
Summary
During the last few decades, significant progress has been made in the promotion and application of carbon fiber-reinforced polymer (CFRP) composites in retrofitting and strengthening civil constructions due to their advantages, which are namely, light weight, high strength, excellent fatigue resistance, and a simple application method [1]. For reinforced concrete (RC) structures, externally bonded CFRP sheets/plates have been widely used as a valid reinforcement method [2]. A good interfacial bonding property between CFRP and concrete provides an important precondition for the excellent work performance of this reinforcement method. Many CFRP-strengthened structures, such as RC bridges, are required to suffer both static and fatigue loading during the service life. A precise expression of bond–slip relationship of the CFRP–concrete interface under static and fatigue loading is a base for the reasonable and accurate prediction of the mechanical performance of RC bridges that are strengthened by externally bonded CFRP. Systematic investigations have been carried out on the bond–slip behavior between CFRP and concrete under quasi-static loading. Comprehensive research studies, which include the mechanical experiments [3,4,5,6,7], analytical analysis, and numerical analysis [8,9,10,11,12,13,14,15,16], have been performed on static
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