Eccentric punching strength of continuous flat slabs—Analysis of different experimental setups

Abstract

This paper analyses the performance of the experimental setups to assess the punching strength of slab-column connections in continuous flat slabs under vertical and horizontal loading. In the last years, several experimental campaigns have been performed to investigate the punching strength of slabcolumn connections, but most of the experimental tests concerned isolated slab-column connections. Among the few setups aimed at reproducing the eccentric punching failure in continuous flat slabs, the setup developed at the NOVA School of Science and Technology in Lisbon is considered in this paper. The performance of the Lisbon setup is assessed through nonlinear finite element analyses, calibrated on experimental data, by comparison with numerical results of a theoretical continuous setup. Then, the performance of the isolated setups, used in many researches and at the base of some international codes, is also evaluated through the same finite element model. Numerical analyses highlight that the setup developed in Lisbon could provide reliable ultimate rotations of continuous flat slab connections, but it underestimates the punching strength. Despite isolated setups lead to similar results when compared

Numerical Evaluation of the Punching Shear Strength of Flat Slabs Subjected to Balanced and Unbalanced Moments

“…In the literature, few studies address the punching resistance of flat slabs under eccentric loading. However, most of these studies [6,[11][12][13][14] focus on experimental approaches, with only the works of Zivkovic et al [4] and El-Naqeeb and Abdelwahed [15] providing a numerical assessment of this phenomenon. Zivkovic et al [4] investigated the influence of eccentric loads and openings close to the columns on the punching resistance of plain and reinforced concrete flat slabs.…”