Shear-bending failure modeling of concrete ribbed slabs strengthened with UHPFRC

Behavior and punching capacity of flat slabs with the rational use of UHPFRC: NLFEA and analytical predictions

“…In order to ease the identification of the material parameters used in the reference finite element models, Table 7 summarized the main information of the materials models used for the stressstrain behavior and damage evolution of NSC and UHPFRC. 8, as provided in other numerical studies [64,65]. In order to avoid numerical convergence problems, the maximum value for the damage parameters was assumed as 0.9, which is also consistent with experimental measurements from this variable for both materials [4,66].…”

“…UHPFRC with the CDP model [31,65,[82][83][84][85][86], most of the input parameters used herein were derived from inverse analyses of experimental investigations [2,4], which increases the consistency of the selected parameters and the validity of the results. For instance, some authors proposed to use a dilation angle ranging from 10º to 15º due to the enhanced dense microstructure of the UHPFRC [85,87].…”

Strengthening of Concrete Structures Using UHPC - Experimental Verification

“…From all these reasons UHPC becomes a suitable material for strengthening of existing structures. High mechanical properties guarantee that a thin additional layer to existing concrete increases load carrying capacity of existing concrete element and the added weight of new concrete (UHPC) will be rather limited [1,2,3,4]. An added thin layer also will not significantly influence the inside space, the height of rooms in buildings will be reduced only very little.…”

One-way shear and punching strength of reinforced concrete slabs without transverse reinforcement under concentrated loads

“…In order to ease the identification of the material parameters used in the reference finite element models, Table 6-7 summarized the main information of the materials models used for the stress-strain behavior and damage evolution of NSC and UHPFRC. The stress-inelastic strain values used for NSC (slab C1.8) and UHPFRC (slab U1.8) are listed in Table 6-8, as provided in other numerical studies (MARTÍN-SANZ et al, 2020;ZHU et al, 2020). In order to avoid numerical convergence problems, the maximum value for the damage parameters was assumed as 0.9, which is also consistent with experimental measurements from this variable for both materials (FELIPE et al, 2019;.…”

“…The calibrated FEM predicted precisely the punching shear capacity and the governing failure mode of NSC, UHPFRC, and NSC-UHPFRC flat slabs. Compared to other studies that also modeled UHPFRC with the CDP model (BAHIJ et al, 2018;FANG et al, 2019;JANG et al, 2018;MAHMUD;YANG;HASSAN, 2013;MARTÍN-SANZ et al, 2020;OTHMAN;MARZOUK, 2018;WU et al, 2019), most of the input parameters used herein were derived from inverse analyses of experimental investigations (KRAHL; CARRAZEDO; EL DEBS, 2018; KRAHL; GIDRÃO; CARRAZEDO, 2019), which increases the consistency of the selected parameters and the validity of the results. For instance, some authors proposed to use a dilation angle ranging from 10º to 15º due to the enhanced dense microstructure of the UHPFRC (CHEN; GRAYBEAL, 2011; OTHMAN; MARZOUK, 2018).…”