In order to study the cyclic bond strength between the steel rebar and steel-polypropylene hybrid fiber reinforced concrete( HFRC),a total of 36 specimens were designed by means of pull-out test taking the effects of volume fraction and aspect ratio of steel fiber( SF) and polypropylene fiber( PF) into consideration. The results show that the introduction of hybrid fibers has a synergetic effect on improving the bond strength,and SF exhibits a more pronounced influence. For the HFRC specimen,whose volume fr...