Post-Punching Behavior of Flat Slabs

Simulation of punching and post-punching shear behaviours of RC slab–column connections

“…( 4) and the calibrated characteristic effective plastic strain s, max ε for steel were used to simulate all the eight DPS/UPS specimens (Yang et al, 2018;Diao et al, 2018). In addition, another four SCC specimens (PM9-12) with integrity bars (Ruiz et al, 2013) were also simulated to further confirm the reliability of the modelling techniques developed herein. highlights the punching (first peak) and post-punching shear (second peak) capacities, denoted as Vp and Vpp respectively.…”

“…Secondly, the accuracy of the proposed model is further validated by simulating four specimens reported in the post-punching shear study of Ruiz et al (2013). Thirdly, the punching shear failure mechanism of a typical SCC is discussed by studying the stress states of the concrete elements on the critical punching shear surface and the punching shear strength contributions by both the concrete and reinforcement.…”

“…Regarding post-punching shear behaviour, limited experiments were conducted to investigate the post-punching shear capacity (Melo and Regan, 1998;Diao et al, 2019) and the influencing design variables such as slab thickness, amount and arrangement of integrity bars, and inclusion of shear reinforcement (Habibi et al, 2012;Ruiz et al, 2013). Along with these experimental investigations, several analytical studies have also been conducted.…”

“…For example, Melo and Regan (1998) suggested lower bound approaches to calculate the post-punching shear capacity, governed by either dowel action or strength of the integrity bars. Ruiz et al (2013) further considered the contribution of flexural reinforcing bars, with its upper limit being controlled by dowel actions resisted by the concrete. Habibi et al (2014) also proposed a comprehensive, yet complicated, solution to predict the post-punching shear behaviour.…”

Proposta para o cálculo de carga de ruptura por punção em lajes de concreto reforçado com fibras de aço

“…Em casos onde a laje não é reforçada para resistir à punção, a ruptura do sistema ocorre de maneira frágil, sem nenhum "aviso prévio". (NGUYEN-MINH et al, 2011 e RUIZ;MIRZAEL;MUTTONI, 2013). O aumento da espessura da laje melhora a resistência à punção, entretanto não é uma alternativa viável devido ao substancial aumento nos custos e peso da estrutura.…”