Experimental analysis of punching shear in flat slabs with variation in the anchorage of shear reinforcement

This study experimentally assessed the behavior of interior slab-column connection in a system of reinforced concrete slabs subjected to symmetrical loading, with anchorage variation of shear reinforcement. Eight slab models (with equal flexural reinforcement and same dimensions) were assessed, being seven with shear reinforcement (different anchorages of shear reinforcement in the flexural reinforcement) and one slab for reference only reinforced for flexion. Experimental data were compared with the theoretical methods established by the following code designs: ACI 318 (2019), Eurocode 2 (2004), ABNT NBR 6118 (2014), andfibModel Code (2010). Although anchoring is an important parameter, it was found that the anchorage of the shear reinforcement in the flexural reinforcement did not significantly interfere with punching shear. The adopted shear reinforcement anchoring obtained better results concerning ultimate load only in the compressed longitudinal reinforcements.