Abstract:
Through pull-out test of steel bars with strain gauges attached inside, the effect of bar diameter,
la/
d and
c/d on the bond performance between steel bars and HPP fiber reinforced lightweight aggregate concrete was analyzed. The results of the pull-out test with different influential parameters showed that the bond stiffness between the bar and concrete was enhanced with the increase of steel bar diameter, and the ultimate bond strength was increased firstly and then decreased as the diameter was increased. The ultimate bond strength and corresponding free end displacement was reduced as the anchorage length was increased. The bond toughness declined as
la/
d was increased. The ultimate bond strength was increased firstly and then tended to become stable with the increase of the relative thickness of concrete cover. By comparing the bar anchorage length formula according to the test results with that given in the code, it was shown that the bar anchorage length formula in the code is conservative in terms of ultimate bond strength.