Publication

Punching of edge columns with and without shear reinforcement: an experimental investigation

Aurelio Muttoni, Diego Hernández Fraile, Andri Setiawan, Júlia Borges Dos Santos
2022
Conference Papers

Abstract

Most research efforts in the past related to the punching resistance of reinforced concrete slabs have concentrated on the response of internal slab-column connections, where significant advances in the state-of-the-art have been performed. Other than internal connections, edge slab-column connections are also very common cases in flat slabs, with a strength usually governed by punching shear conditions as well. Their response is more complex than those of internal slab-column connections, due to the potential moment transfer from the slab to the column and to the uneven shear and moment fields. However, scanty experimental evidence is available due to the difficulty of testing such system under realistic conditions. As a consequence, knowledge on the phenomena governing failure is still limited and predictions of the strength are in most cases performed by adapting punching shear models for internal slab-column connections. In this paper, the main results of an experimental programme on edge slab-column connections is presented, comprising specimens both with and without shear reinforcement. A novel test setup was developed to effectively introduce the effect of continuity in the direction perpendicular to the free edge of the slab. Moreover, refined measurements were performed by using Digital Image Correlation on the concrete surfaces and Fibre-Optic Measurements in selected flexural reinforcement bars and shear reinforcement, allowing for direct measurements of displacements and strains in the critical regions. Based on the experimental observations, a discussion is held on the mechanics governing punching failures of edge slab-column connections.

Official source

https://infoscience.epfl.ch/entities/publication/4f771263-468d-42bc-bc19-d99ad353fb5f

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Aurelio Muttoni, Diego Hernández Fraile, Andri Setiawan, Júlia Borges Dos Santos
2022
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/4f771263-468d-42bc-bc19-d99ad353fb5f

About this result

Related concepts (13)

Concrete slab

A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. Steel-reinforced slabs, typically between 100 and 500 mm thick, are most often used to construct floors and ceilings, while thinner mud slabs may be used for exterior paving . In many domestic and industrial buildings, a thick concrete slab supported on foundations or directly on the subsoil, is used to construct the ground floor. These slabs are generally classified as ground-bearing or suspended.

Reinforced concrete

Reinforced concrete, also called ferroconcrete, is a composite material in which concrete's relatively low tensile strength and ductility are compensated for by the inclusion of reinforcement having higher tensile strength or ductility. The reinforcement is usually, though not necessarily, steel bars (rebar) and is usually embedded passively in the concrete before the concrete sets. However, post-tensioning is also employed as a technique to reinforce the concrete. In terms of volume used annually, it is one of the most common engineering materials.

Concrete

Concrete is a composite material composed of aggregate bonded together with a fluid cement that cures over time. Concrete is the second-most-used substance in the world after water, and is the most widely used building material. Its usage worldwide, ton for ton, is twice that of steel, wood, plastics, and aluminium combined. When aggregate is mixed with dry Portland cement and water, the mixture forms a fluid slurry that is easily poured and molded into shape.

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