Computational modeling of flat slabs with openings reinforced with HPFRC under punching shear stress

Flat slab structures have been largely studied over the last decades since its structural behavior presents complex phenomenon, particularly the punching shear. The implement of openings near the columns is a common procedure and can affect the slab punching shear capacity. The high/ultrahigh-performance fiber-reinforced concrete (HPFRC/UHPFRC) has been demonstrated an alternative for structural reinforcement and connections. In this context the study of reinforcing the shear punching region with HPFRC has been carried out and showed positive results in terms of punching shear strength. This research carried out the simulation of a flat slab structure with openings reinforced with HPFRC in the punching region. The validation of the numerical model is done by comparing it with the results obtained from the experimental test and the behavior of the slab in relation to the shear caused by the punching. The numerical model will be developed by the commercial finite element software ATENA. Finally, a parametric study was conducted to evaluate the influence of the slab opening and the improvement in this behavior with the presence of HPFRC reinforcement in the column region.