Punching shear resistance of flat slabs with different types of stirrup anchorages such as shear reinforcement

Concrete codes demand that the stirrup type shear reinforcements must be adequately anchored in the longi-tudinal reinforcements. However, this requirement hinders the executive process and makes the use of some reinforcements unfeasible. The goal of the present study was to assess the influence of different types of anchoring of shear reinforcements with closed stirrups on the punching resistance of flat slabs that do not meet the code's standards. An experimental program was conducted assessing nine flat square slabs, a reference slab, and four different types of detailings concerning anchoring. Only one of those details met the normative pre-scriptions. As a result, it was found that the variation in the anchorage of the stirrups had not influenced the behavior of the slabs. All types of connections had similar punching shear resistance increases.