Abstract
This paper studied the interface slip between the CFRP sheet and the steel beam under the action of temperature and creep. The formulas of the interface slip were established by using the elastic method and energy variational method, respectively, and the accuracy of the formulas was verified by finite element analysis Abaqus. The results showed that when the creep was not taken into account, the interface slip was the maximum at the end of the beam and the minimum at the middle of the span. When the temperature increased to 5°C, the slip increased about 0.005 mm. And when the thickness of the CFRP sheet increased to 0.05 mm, the slip increased about 0.003 mm. When the creep was taken into account, the interface slip increased with the increase of load and decreased with the increase of stiffness. When the stiffness reached about 10 ka, the variation of the stiffness on the slip was basically unchanged.
Highlights
Relative slip will occur between CFRP material and steel structure when the steel structure is reinforced with CFRP material. is slip may lead to peeling failure of the interface
Previous studies [1] showed that the interface peeling failure was an important reason why the CFRP materials cannot achieve the effect of strengthening and repairing steel structures. e interface slip between the interface of the steel beam and the CFRP sheet will occur under the action of temperature and creep when the steel beam is strengthened with the CFRP sheet. e interface slip will affect the interfacial interaction, reduce the bearing capacity and stiffness, and increase the deflection of the beam
Yu et al [3] conducted an experimental study on the interface properties of CFRP plates and steel plates. e type of adhesive, the thickness of the adhesive layer, and the stiffness of CFRP plates were taken as parameters. e results showed that the bonding strength was closely related to the interfacial fracture energy. e bond strength was positively correlated with the stiffness of the CFRP plate
Summary
Relative slip will occur between CFRP material and steel structure when the steel structure is reinforced with CFRP material. is slip may lead to peeling failure of the interface. E effective bond length, axial strain distribution, and interfacial shear stress distribution of the CFRP-steel interface have little influence on the maintenance environment, and the increase of temperature could effectively improve the bond strength. Wei et al [15] conducted 12 double-shear joint tests of the CFRP plate and steel and analyzed the failure mode, ultimate load, CFRP plate strain, interfacial shear stress, and bond-slip relationship. Xu et al [16] carried out long-term loading tests of CFRP-steel double-shear tests with 4 interfacial shear stress levels and 6 kinds of holding times in order to study the influence of loading history on the interfacial bond properties of steel structures reinforced by CFRP and carried out static tensile failure on the specimens that reached the specified loading time. It can be found that the analysis of the interface slips under the influence of temperature and creep is relatively rare based on the research studies. is paper gave the calculation formula of the interface slip between the CFRP sheet and the steel beam under the effect on temperature and creep using the elastic method and energy variational method, and the accuracy of the formula was verified by Abaqus. en, the influences of design parameters were discussed
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