Research on bearing capacity model of CFRP plate-concrete interface after seasonal temperature cycling
Through the double-sided shear test,the variation of the ultimate bearing capacity of the CFRP plate-concrete interface after the temperature cycle of-20～60℃ was studied.The macro-mechanical properties,interface failure characteristics and interface ultimate bearing capacity of the materials without seasonal temperature cycles and after 50,100 and 150 seasonal temperature cycles were compared and analyzed.The results show that with the increase of the number of seasonal temperature cycles,the post-curing effect of epoxy resin glue will increase its tensile strength,shear strength and elastic modulus,and the elongation will decrease.The increase of the number of seasonal temperature cycles has little effect on the mechanical properties of concrete and CFRP plates.The interface failure modes are different when the strength grades of concrete are C30 and C50.With the increase in the number of seasonal temperature cycles,the ultimate bearing capacity of the interface increases.At the same time,based on the model by Naubauer&Rostasy,Chen&Teng and Lu Xinzheng,a modified model for the ultimate bearing capacity of the interface after the seasonal temperature cycle was proposed.The results show that calculated values of the model are in good agreement with the test results.
seasonal temperature cycleCFRP plate-concrete interfacefailure modeultimate bearing capacity
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