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Title: Punching-Shear Strength of Reinforced Concrete Slabs Subjected to Concentric Transverse Loads and In-Plane Tensile Forces

Author(s): Antonio Mari, Pablo G. Fernandez, Eva Oller, and Antoni Cladera

Publication: Symposium Paper

Volume: 357


Appears on pages(s): 139-159

Keywords: Punching-shear, in-plane tensile force, slab, tests, mechanical model, reinforced concrete, yielding, cracking

DOI: 10.14359/51738764

Date: 4/1/2023

Reinforced concrete slabs can be subjected simultaneously to transverse loads and in-plane tensile forces, as it occurs in top slabs of continuous box girder bridges at intermediate supports, or in flat slabs supported on columns, subjected to horizontal loads. To study the effects of in-plane forces in the slab punching-shear strength, an experimental and theoretical investigation was carried out, which is described in this paper. Five square slabs of 1650 mm (42”) side and 120 mm (4.7”) thickness were tested under a centered transverse point load and different degrees of uniaxial in-plane tensile force. Numerical predictions using non-linear finite element analyses were performed to help in the experiments design. Furthermore, the punching-shear mechanical model, Compression Chord Capacity Model (CCCM), was extended to incorporate the effects of in-plane tensile forces. The experimental results showed that the punching strength linearly decreases with the level of applied tensile force and, if cracking in the slabs is produced by the tensile force, yielding of the reinforcement and further reduction may take place. Excellent agreement was found between theoretical predictions and tests results. Furthermore, the CCCM was verified with available results of punching tests with uniaxial and biaxial tensile forces, obtaining very good results.