Effect of Supplementary Reinforcement on the Pull-out of Cast-in-Place Anchors

The most recent design codes and guidelines for anchors are based on the rather conservative hypothesis that the load-bearing capacity be the greater between the resistance corresponding to concrete-cone breakout and that corresponding to supplementary reinforcement failure, because of either steel yielding or bond collapse. Among the few studies available in the literature on the behavior of anchors placed inside locally-reinforced concrete, a new analytical model was proposed by Sharma, who demonstrated that the local reinforcement contributes to anchor resistance. Within such a framework, some results are presented and commented from an experimental campaign on cast-in place anchors embedded inside concrete blocks heavily reinforced with closed stirrups to prevent concrete-cone breakout: Predictive models are recalled as well.