Aurelio Muttoni | EPFL Graph Search

Aurelio Muttoni est professeur ordinaire et directeur du Laboratoire de Construction en Béton de l’Ecole Polytechnique Fédérale de Lausanne (Suisse). Il a reçu son diplôme et son doctorat en génie civil de l’Ecole Polytechnique Fédérale de Zürich à Zürich, Suisse, en 1982 et 1989 respectivement.

Ses activités actuelles en matière d’enseignement se concentrent sur la conception des structures, la théorie et le dimensionnement des structures en béton ainsi que la conception des ponts. Son groupe de recherche est actif dans les domaines suivants : comportement et méthodes de dimensionnement des structures en béton, conception de structures innovantes, effort tranchant dans les structures en béton, poinçonnement des dalles, analyse non-linéaire des structures incluant leur fiabilité, adhérence entre l’acier et le béton, engrènement des granulats, fatigue et influence de la durée de chargement sur la résistance du béton, comportement mécanique et principes de dimensionnement pour le béton à ultra-hautes performances, béton textile et béton recyclé.

Aurelio Muttoni a reçu la distinction Chester Paul Siess Award for Excellence in Structural Research en 2010 et la médaille Wason for Most Meritorious Paper en 2014, toutes deux décernées par l’ American Concrete Institute . Il est membre du Presidium de la fib (Fédération Internationale du Béton), de plusieurs commissions et groupes de travail de la fib et il a dirigé le Project Team pour la deuxième génération de la norme européenne EN 1992-1-1 (Eurocode pour les structures en béton).

Aurelio Muttoni est aussi co-fondateur et associé du bureau de conseil Muttoni & Fernández (www.mfic.ch). Ce bureau est actif dans la conception, l’analyse et le dimensionnement de structures porteuses pour les constructions d’architecture et de génie civil, ainsi que dans le conseil en matière d’ingénierie structurale.

A new perspective on the punching resistance of edge columns with and without shear reinforcement applying refined measurement techniques

Diego Hernández Fraile, Aurelio Muttoni

Despite edge columns being instrumental components of flat slabs, most punching research has focused on internal connections. Several particularities of edge columns, such as load eccentricity and moment transfer, require additional experimental investigations. This paper examines the behaviour of edge connections on the basis of two tests on edge panels (one with shear reinforcement, one without). The setup was designed to approximate the actual boundary conditions of this type of connection in a flat slab. Refined measurement techniques have been extensively used. The global slab behaviour is analysed, as is the influence of the shear reinforcement. The focus then shifts towards shear stress concentrations, analysing the column penetration and the shear reinforcement activation. The impact on design of the incorporation of stress redistributions in FE modelling is then evaluated.

Fédération Internationale du Béton (fib)2022

Anchorage of shear reinforcement in beams and slabs

Miguel Fernández Ruiz, Frédéric Monney, Aurelio Muttoni, Qianhui Yu

Anchorage of shear reinforcement, such as links or stirrups, can be performed by providing hooks, bends or heads at their ends, by welding transverse reinforcement or by closing open stirrups with pins. Hooks and bends, also used to enhance the anchorage of flexural reinforcement at the end regions of beams and slabs, have often been preferred because of their simple and cost-effective production. Such anchorages present nevertheless several peculiarities that shall be accounted for. They are relatively sensitive to their detailing (mandrel diameter, length of the tail segment between bar end and bent region) as well as to the cracking state of the surrounding concrete. Also, brittle failures can occur due to spalling of the concrete cover in case of bars near to a free surface. The anchorage with hooks and bends is currently still widely designed according to old detailing rules, based on the results of tests performed in many cases with materials whose properties are significantly different than those of nowadays. Also, no mechanical models are available for a consistent verification and detailing, acknowledging the different potential failure modes and their interaction with the surrounding concrete. In an effort to provide a consistent approach to its design and verification, this paper presents an investigation addressed at understanding the mechanical response and performance of bend and hook anchorages. To that aim, the results of an experimental programme performed with state-of-the-art instrumentation are introduced. By means of analysis of Digital Image Correlation and Fibre-Optic Measurements, the complete transfer of forces is analysed under different circumstances. On that basis, a consistent mechanical model is developed and validated, also reproducing a large variety of tests found in the literature. The paper introduces eventually several practical considerations on the activation of shear reinforcement in beams, and the level of performance required at its anchorages.

ELSEVIER SCI LTD2022

Characterization of shear deformations in reinforced concrete members without shear reinforcement

Raffaele Cantone, Miguel Fernández Ruiz, Aurelio Muttoni, Andri Setiawan

The load-carrying capacity of many reinforced concrete structures is governed by shear failures, occurring before reaching the flexural capacity of the member. For redundant systems, such as slabs subjected to concentrated loads, local shear failures (typically initiated at locations with highest shear forces) can however occur after redistributions of internal forces due to the propagation of the shear cracks. Such process can depend upon the development of shear strains and the softening response of the member and can be stable or unstable. A suitable understanding and modelling of the complete shear response of reinforced concrete, including its deformations both for its pre-and post-peak branches, is thus instrumental for a consistent and comprehensive analysis of the shear response and strength of redundant elements.Such topic has received little attention in the past and analyses of redistributions of internal forces in concrete structures are often performed on the basis of refined flexural models, but coarse considerations for shear strains (typically elastic laws). This situation is a consequence of the lack of consistent experimental measurements on the shear deformations of reinforced members both before and after reaching the maximum shear capacity. Currently, however, the advent of refined measurements techniques such as Digital Image Correlation allows for an accurate tracking of the shear strains and for a fundamental understanding of its development. In this paper, taking advantage of such techniques, a comprehensive approach for determining the shear strains and their distribution across the depth of a section is presented. This approach allows reproducing accurately the development of shear strains and to predict the load-carrying capacity of redundant systems. The model is validated with selected test data and is considered as an effort to contribute to future numerical implementations of reinforced concrete shell models with realistic out-of-plane responses.

ELSEVIER SCI LTD2022

Characterization of shear deformations in reinforced concrete members without shear reinforcement

Raffaele Cantone, Miguel Fernández Ruiz, Aurelio Muttoni, Andri Setiawan

ELSEVIER SCI LTD2022

Anchorage of shear reinforcement in beams and slabs

Miguel Fernández Ruiz, Frédéric Monney, Aurelio Muttoni, Qianhui Yu

ELSEVIER SCI LTD2022