In order to explore the bond performance between basalt fiber reinforced composite bars(BFRP)and ultra-high performance fiber reinforced concrete(UHPFRC),the failure mode and bond slip curve of BFRP-UHPFRC specimens are analyzed through central pull-out test,and the effects of bar diameter,single fiber and steel PVA hybrid fibers on the bond strength are discussed.The results show that the failure modes of the specimens include pull-out failure and tensile failure of BFRP bars.The increase of the diameter of BFRP bars will lead to the decrease of bond strength.With the increase of single fiber content,the bond strength first increases and then decreases.Compared with single fiber,steel PVA hybrid fiber significantly improves the bond strength of the specimen.When 1%steel fiber and 0.5%PVA fiber are added,the bond strength is the highest(25.35 MPa).In addition,the support vector regression model optimized by the gray wolf algorithm is used to predict the bond strength,and the predicted value fits well with the actual value.
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