Punching shear strength of interior concrete slab–column connections reinforced with steel fibers

Punching shear strength of steel fibre reinforced concrete slabs

“…Harajli et al [8] proposed an empirical design equation for the punching shear capacity of SFRC slab-column connections based on a best fit linear regression of the coupled contribution of concrete and fibres. Choi et al [15] performed a theoretical study to propose a design equation based on a FRC failure criteria. The formula proposed considers the assumption that yielding of tensile reinforcement occurs prior to punching shear failures, which is valid for thin slabs with large span to thickness ratios.…”

Punching Shear Capacity Analysis of Reinforced Concrete Slab-column Connections

“…The model is based on the physical behavior of the connections under load, and is therefore applicable to both lightweight and normal weight concrete. Choi et al [2] performed a theoretical study to investigate the punching shear strength of interior slab-column connections made of steel fiber reinforced concrete. Park et al [3] developed a strength model to predict the direct punching shear strength of interior slab-column connections without shear reinforcement.…”

Consideration on punching shear strength of steel-fiber-reinforced concrete slabs

“…As shown in Table 1, there are few models for estimating the punching shear strength of SFRC flat plate slabs proposed in previous studies. 3,15,16 Narayanan and Darwish 15 derived a semiempirical equation for the punching shear strength of SFRC slabs, based on their experimental observations, considering the splitting tensile strength of the SFRC (f spf ), shear contribution of the steel fiber (v b ), longitudinal reinforcement ratio (r s ), and perimeter of the critical section of the SFRC slab (b f ). In their approach, the perimeter of the critical section decreases as the fiber factor (F) increases, and the effect of the longitudinal tension reinforcement ratio was also directly reflected.…”

“…Many researchers are, however, concerned about the punching shear failure that can happen in a two-way flat plate slab system, and consequently, they have suggested many alternatives for enhancing its brittle failure characteristics. [1][2][3][4] Previous studies suggested the use of conventional shear reinforcement, shear head steel, shear stud, helix reinforcement, and lattice reinforcement to enhance the punching shear capacity of flat slab structures. [5][6][7][8][9][10] Many recent studies suggested instead the use of steel-fiber-reinforced concrete (SFRC) in the entire slab or partial area around the column near the slab-column connection.…”

“…[5][6][7][8][9][10] Many recent studies suggested instead the use of steel-fiber-reinforced concrete (SFRC) in the entire slab or partial area around the column near the slab-column connection. 3,4,[11][12][13][14] This is based on many test results of SFRC flat slabs, in which their punching shear strength and deformation capacity were markedly improved compared to the conventional reinforced concrete (RC) flat plate slabs.…”