Open-access Parametric investigation of the effect of moment transfer on the punching shear strength of slab-column connections

Abstract

In slab-column connections, high shear stresses are concentrated, favoring the occurrence of punching failure. In building design, the transfer of unbalanced moments in the slab-column connection is common, significantly reducing the punching resistance. However, some standards present greater imprecision for cases with unbalanced moment. In this context, to investigate the effect of moment transfer on the punching resistance of reinforced concrete slab-column connections without shear reinforcement, nonlinear numerical modeling of the specimens experimentally tested by Kruger (1999) was initially performed using the finite element software ATENA. The computational models were validated through the comparison of load versus displacement results, vertical displacement profiles, damage evolution, and failure surfaces. Based on this validation, a parametric study was carried out using these computational models, varying the loading eccentricity. By comparing the results obtained in the parametric analysis with the predictions of the American and Brazilian codes, results were obtained that indicate the effects caused by eccentricity on punching resistance.

Keywords
Reinforced Concrete; Slab-Column Connection; Computational Modeling; Punching resistance; Unbalanced moment

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