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This work presents an experimental investigation on the behavior of nine reinforced concrete fiat slabs with dimensions of 1800 x 1800 * 130 mm. The slabs were divided according to the number of openings adjacent to the column (reference slab, slab with two or four openings), as well as the presence or absence of stud shear reinforcement. The parameters evaluated in the research refer to the failure modes observed, vertical deflections, and concrete strains and flexural and shear reinforcement strains. It studied the influence of the openings in the maximum displacements, and deformations of steel and concrete of the flat slab with and without shear reinforcement. The influence of the openings near the column was analyzed and the contribution of the use of shear reinforcement to overcome the loss of resistance was analyzed. The experimental resultswere compared with ACI318 and NBR 6118. The testresults showed that the equations' punching shear resistance prediction for ACI 318 overestimated up to 131% in slabs with openings. Keywords: flat slabs; openings; punching shear; shear reinforcement; studs.

The modeling of steel fiber reinforced concrete (SFRC) is a challenging task in comparison with the conventional reinforced concrete structures. Softening functions used to numerically reproduce SFRC fracture need to describe the effects associated with the post-cracking residual strength induced by the fibers in the concrete matrix. In order to do this, multilinear softening functions can be used to consider these effects. The work presents the results of a study in which the behavior of a SFRC beam tested in four-point bending test is compared with the responses obtained in nonlinear simulations using the finite element method. Multilinear softening functions are obtained through an inverse analysis technique, aiming to reproduce the phenomena of appearance and propagation of cracks. The simulations were performed using ATENA/GiD software. The technique adopted to find the softening function of SFRC allowed to reproduce, with a good agreement, the behavior reported experimentally.

An anchoring system can be loaded by tensile or shear stresses or a combination of these two; this study was limited to anchors subjected to tensile stresses. In this study, 33 anchor bolts, which were subjected to tensile stresses and divided into four series, were tested. The following are the primary variables tested: diameter, number of hooks, and number of supplementary reinforcement layers. The results obtained from the anchoring tests are shown, such as the failure mode and load, vertical displacements, and strains in the reinforcement bars. The results show that the anchoring strength increases with the presence of supplementaryreinforcement.