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Redaelli Dario

Professeur HES associé

Hauptkompetenzen

Professeur HES associé

Telefon-Nummer: +41 26 429 66 80

Büro: HEIA_D40.05

Haute école d'ingénierie et d'architecture de Fribourg
Boulevard de Pérolles 80, 1700 Fribourg, CH

Institut
iTEC - Institut des technologies de l'environnement construit

BSc HES-SO en Génie civil - Haute école d'ingénierie et d'architecture de Fribourg

MSc HES-SO en Engineering - HES-SO Master

Abgeschlossen

NextEarthBuild ' « Une nouvelle génération d'éco-construction en terre d'excavation recyclée »

AGP

Rolle: Hauptgesuchsteller/in

Financement: HES-SO Rectorat

Description du projet : Pour rendre possible une densification urbaine durable tout en maintenant une qualité de vie acceptable, il est indispensable de repenser la manière et la matière dont les bâtiments et les aménagements sont conçus et construits. Parmi les déchets de la construction qui ne sont pas valorisés, la terre d'excavation présente le volume le plus important. Ce projet, réalisé en collaboration avec la Haute École d'Ingénierie et de Gestion du canton de Vaud (HEIG-VD), vise à faire de la terre d'excavation une nouvelle matière première qui offre une solution pragmatique et rentable au problème de la construction de bâtiments et des aménagements extérieures, tels que les parkings et les chemins piétons, souvent réalisées en béton ou en mortier silico-calcaire. La terre d'excavation pourrait donc devenir : - le composant incontournable d'une nouvelle technique de construction et de préfabrication appelée shotearth (terre projetée) ; - l'ingrédient qui rend végétalisables et auto-recyclables des nombreux aménagements extérieurs. Ce projet a pour but de développer des nouvelles manières de concevoir et de construire avec la terre d'excavation, grâce à : - l'utilisation de techniques de fabrication innovantes (projection classique, impression 3-D d'élément complexes) ; - l'optimisation des matériaux, alliant performances et éco-compatibilité ; - l'optimisation de la forme et du lien entre forme et fonction.

Forschungsteam innerhalb von HES-SO: Leopold Sebastian , Galé Benjamin Claude , Delaquis Dominique , Redaelli Dario , Lasvaux Sébastien , Murith Noé , Savino Vincenzo , Bourrier Hervé , Schranz Noè , Albertoni Loran , Agustoni Amedeo , Goulouti Kyriaki , Viviani Marco , Frossard Mija

Partenaires académiques: INSIT; IGT; FR - EIA - Institut iTEC; FR - EIA - Institut SeSi

Partenaires professionnels: Pittet

Durée du projet: 16.08.2019 - 18.01.2023

Statut: Abgeschlossen

Journée BFUP 2015 22 octobre 2015

AGP

Rolle: Hauptgesuchsteller/in

Financement: inscriptions; Divers

Description du projet : Suite au succès obtenu lors de la première Journée d'étude sur les Béton Fibrés à Ultra hautes Performances, qui a eu lieu à l'EIA de Fribourg en 2011, une deuxième journée est organisée en Septembre 2015 en collaboration avec l'EPFL et la Haute École Bernoise. Cette journée sera l'occasion de présenter le nouveau cahier technique 2018 de la Société des Ingénieurs et des Architectes (SIA), qui concerne le dimensionnement des structures en Béton Fibré à Ultra Hautes Performances et qui a vu la participation de plusieurs collaborateurs ou anciens collaborateurs de l'EIA-FR (René Suter, Lionel Moreillon, Blaise Fleury).

Forschungsteam innerhalb von HES-SO: Nseir Yared Joanna , Redaelli Dario , Ricci Laurent , Schranz Noè , Muresan Alex-Manuel

Partenaires académiques: FR - EIA - Institut iTEC; EPFL - ENAC - MCS; Berner Fach-Hochschule; Redaelli Dario, FR - EIA - Institut iTEC

Durée du projet: 01.10.2015 - 31.12.2021

Statut: Abgeschlossen

Build-Unbuild-Repeat : a multi-generation structural system for office buildings

AGP

Rolle: Hauptgesuchsteller/in

Financement: FR - EIA - Général école Ra&D; FR - EIA - Institut iTEC; SLL HEIA-FR; EPFL - SXL; FR - EIA - Institut iTEC

Description du projet : The project is the result of a collaboration between Structural Xploration Lab (EPFL, Prof. Corentin Fivet, research leader) and Institute of Environnemental and Construction Technologies (HEIA, Prof. Dario Redaelli). The goal of this research is to develop a structural (i.e. load bearing) system that can be reused over a minimum of three building lifespans. The unusual requirements for such a promising system are threefold: (1) elements must be robust enough to withstand chemical and mechanical attacks over a very long period of time ' e.g. 200 years at almost zero maintenance cost; (2) the system must allow its deconstruction and reconstruction at minimum twice and with minimum transformation costs, meaning that a minimum of material should be replaced or repaired; (3) in case of deconstruction/reconstruction, the modularity of the system will allow to rearrange the geometry of the structural skeleton (spans, position of columns, walls and openings, etc.)

Forschungsteam innerhalb von HES-SO: Redaelli Dario , Zwicky Daia , Rime Alain , Muresan Alex-Manuel

Durée du projet: 12.06.2017 - 31.05.2021

Statut: Abgeschlossen

2020

Sustainability through reuse :

Wissenschaftlicher Artikel ArODES

a reconfigurable structural system for residential and office buildings

Alex Muresan, Jan Brütting, Dario Redaelli, Corentin Fivet

IOP Conference Series: Earth and Environmental Science, 2020, vol. 588, article no. 042066

Link zur Publikation

Zusammenfassung:

Current load-bearing systems for buildings rarely have a beneficial end of life. Modular design is a proven solution for revalorizing obsolete structures, but it hardly competes with conventional solutions: the range of future spatial configurations that the modules will accommodate is usually too limited to balance additional upfront costs due to necessary oversized elements and extra connections. Through a review of building demolition cases, this paper first presents motives, challenges and requirements for overcoming adverse end-of-life environmental impacts of building structures. Then a new structural system addressing the specified design constraints is introduced. The system is a highly versatile kit of slab and column elements. Contrary to existing modular solutions, its element dimensions do neither constrain the positioning of columns nor the shape of floor plans. Slab elements are stacked vertically to tune bending and shear stiffnesses locally and ensure serviceability requirements for a wide range of column and load cases layouts. All connections between elements are reversible and ready for reuse. Accordingly, the proposed structural system is well-suited for multiple service cycles and architectural needs, mitigating the detrimental effects that buildings have on the environment.

Structural behavior of prestressed ultra-high performance fibre-reinforced concrete beams with and without openings: comparison between experimental results and finite element modelling techniques

Wissenschaftlicher Artikel

Redaelli Dario, Nseir Yared Joanna

American Concrete Institute, ACI, 2020 , pp. 474-483

2019

Béton fibré ultra-performant :

Buch ArODES

concevoir, dimensionner, construire : 3ème journée d'étude, 24 octobre 2019

Eugen Brühwiler, Cornelius Osterlee, Dario Redaelli

2019, Biel : Berner Fachhochschule ; Architektur, Holz, Bau ; Institut für Holzbau, Tragwerke und Architektur Fribourg : Haute école d'ingénierie et darchitecture Fribourg, 196 p.

Link zur Publikation

Zusammenfassung:

Ultra-Hochleistungs Faserbeton (UHFB) wird in der Schweiz seit mehr als 15 Jahren zur Instandsetzung und Verstärkung bestehender Betonbauten eingesetzt. Zunehmend kommt UHFB auch im Neubau zum Einsatz. Weit über 100 Anwendungen zeigen, dass sich UHFB als hochwertiger Baustoff etabliert hat und die Umsetzung origineller, minimal-invasiver und wirtschaftlicher Baulösungen ermöglicht. Nach den ersten beiden UHFB-Fachtagungen in den Jahren 2011 und 2015 behandelt die 3. Schweizer UHFB-Fachtagung Ingenieurmethoden für den Entwurf und die Bemessung mit UHFB und berichtet über Erfahrungen dei der Ausführung bon UHFB-Projekten. Dadurch sollen die vielfältigen Einsatzmöglichkeiten von UHFB, die Praxistauglichkeit der UHFB-Bauweise und aktuelle Entwicklungstrends aufgezeigt werden.

2016

Experimental and numerical study on the use of high-strength and ultra-high-performance fibre-reinforced concrete in columns

Buchkapitel ArODES

Dario Redaelli, Ana Spasojevic, Aurelio Muttoni

fib Bulletins (pp. 193-202). 2016

Link zur Publikation

Zusammenfassung:

High-strength concrete (HSC) is common.ly used for columns that need to withstand significant compressive forces and bending moments. However, the brittleness that characterized HSC behaviour negatively affects the ultimate strength and ductility of columns. Thanks to fibres, high-strength fibre:-reinforced concrete (HSFRC) and ultra-highperformance fibre-reinforced concrete (UHPFRC) have a rather ductile behaviour in tension and compression and may be used to improve the structural response of highly stressed columns, thus leading to thinner sections and a reduction of ordinary reinforcement. This paper presents the results of a preliminary test campaign on HSFRC and UHPFRC columns under bending with normal force. Several atrrangements of ordinary reinforcement were tested, including columns without any longitudinal or transversal reinforcement. The observed behaviour is interpreted by means of a miechanical model. Based on test results and parametrical analysis, the contribution of fibre:s to the structural response and the possibility to replace ordinary reinforcement with fibres are discussed.

2021

Corrosion of reinforcement in UHPFRC :

Konferenz ArODES

a preliminary study including the effect of cracking

Bianca Paola Maffezzoli, Dario Redaelli, Elena Redaelli

Proceedings of ICD 2021 Italian Concrete Days, Telematico 14-16 Aprile 2021, Web Conference

Link zur Konferenz

Zusammenfassung:

Ultra-High Performance Fibre-Reinforced Concrete (UHPFRC) is characterized by high compressive strength, strain-hardening behaviour in tension and very low porosity. After cracking, crack opening is controlled by the fibres. Therefore, UHPFRC is generally considered as a very durable material and is frequently used in combination with reinforcement for elements exposed to severe environmental conditions. However, scientific evidence on the long-term behaviour of reinforcement embedded in UHPFRC is limited, especially if the simultaneous presence of cracks and chemical attack is considered. This contribution presents the results of a preliminary study carried out to characterize the corrosion behaviour of reinforcement in UHPFRC. Mechanical and durability-related properties of a commercial UHPFRC were determined. Accelerated and long-term corrosion tests were initiated on cracked and uncracked prisms reinforced with carbon or stainless steel rebars.

2020

Structural behavior of prestressed ultra-high performance fibre :

Konferenz ArODES

reinforced concrete beams with and without openings: comparison between experimental results and finite element modelling techniques

Dario Redaelli, Joanna Yared Nseir

fib Bulletins : Fibre Reinforced Concrete: From Design to Structural Applications. Proceedings of the ACI-fib-RILEM International Workshop - FRC2018. Technical report

Link zur Konferenz

Zusammenfassung:

This paper presents the results of a numerical study carried out by the authors to better understand the structural behavior of prestressed beams with web openings and to identify numerical modelling techniques that allow to adequately predict such behavior. Ultra-High Performance Fibre Reinforced Concrete (UHPC) beams are considered, with a focus on shear-controlled failure modes. For all the beams considered in this study, prestressing is used to resist the main bending moment. However, no other reinforcement is added to the beams, in order to emphasize the structural contribution of the fibers and to focus on solutions that could be economically competitive for the precast industry. The results of non-linear simulations performed with existing finite elements codes are compared and validated against experimental results of tests carried out at the University of Applied Sciences of Western Switzerland. The main assumptions of the numerical simulations are discussed, as well as the results and the limits of the analysis.

2019

Etude expérimentale de l'influence du trafic routier sur l'adhérence BFUP/béton :

Konferenz ArODES

concevoir, dimensionner, construire : 3ème journée d'étude, 24 octobre 2019

Dario Redaelli, Blaise Fleury, Daniele Stroligo

Béton fibré ultra-performant : concevoir, dimensionner, construire : 3ème journée d'étude, 24 octobre 2019 ; Ultra-Hochleistungs-Faserbeton : entwerfen, bemessen, bauen : 3. Fachtagung, 24 . Oktober 2019

Link zur Konferenz

Zusammenfassung:

L'emploi des Bétons fibrés ultra-performants (BFUP) dans le cadre de réhabilitation ou de renforcement de ponts permet généralement un raccourcissement de la durée du chantier et une limitation de l'entrave au trafic routier. Afin d'exploiter de manière optimale cet avantage, il est cependant nécessaire de définir si une ouverture au trafic à proximité d'une zone de BFUP récemment mis en place risque de péjorer l'adhérence entre le BFUP et le béton ordinaire (BO) de support et de compromettre l'obtention d'un comportement mixte entre ces deux matériaux. Le présent article résume une étude expérimentale, effectuée au laboratoire de structures de la Haute école d'ingénierie et d'architecture de Fribourg (HEIA). L'étude avait pour objectifs de déterminer l'évolution de l'adhérence entre le BFUP et le BO pendant les premières heures qui suivent la mise en place du BFUP, ainsi que les éventuelles conséquences de vibrations ou de sollicitations cycliques, appliquées entre 0 et 48 heures, sur les propriétés d'adhérence à 28 jours.

Innesco e propagazione della corrosione dell'armatura in calcestruzzi fibrorinforzati ad altissime prestazioni (UHPFRC)

Konferenz ArODES

Elena Redaelli, Bianca Paola Maffezzoli, Dario Redaelli

Proceedings of GnCorrosione (GnC), 3-5 Iuglio 2019, Palermo, Italy

Link zur Konferenz

Zusammenfassung:

This note presents the preliminary results of an experimental investigation aimed at studying the corrosion behaviour of reinforcement in ultra-high performance fibre reinforced concretes. Regarding parameters related with corrosion inititation, tests of capillary absorption, water content and water absorption, electrical restitivity, accelerated carbonation and chloride migration were carried out. Results highlighted that concrete is a very impervious material. Results of corrosion tests - both on carbon steel and stainless steel reinforcements - showed conditions of passivity even after exposure to wetting and drying cycles with chlorides. Only in the presence of cracks, carbon steel reinforcement showed a possible onset of corrosion.

2018

Towards a "comprehensive" and smart platform for coordinated waste management in construction in Geneva? :

Konferenz ArODES

a case study

Damien Varesano, Eric Amos, Bernd Domer, Francine Laferrière, Dario Redaelli, Marco Viviani

Proceedings of 20. Status-Seminar "Forschen für den Bau im Kontext von Energie und Umwelt", Zurich, Switzerland, 6-7 September 2018

Link zur Konferenz

Zusammenfassung:

In order to reduce environmental and financial costs caused by construction material flow, web platforms have been created. Their objective is to increase the visibility of materials available on construction sites and promote their reuse. A benchmark of existing national and international platforms - considering functional aspects, effectiveness and how the platform interacts with local construction community - has been established by the research team. Strengths and weaknesses of each analyzed platform have been identified, giving an up-todate picture. The benchmark points out, that no “comprehensive“ platform, providing material exchange services as well as support for a large and strong user community, exists. Such a platform could be enhanced by several features – like linking it to geographical information systems and technical assistance, creating a coordinated waste management among construction sites thereby. The Great Geneva Area has been identified as an ideal location to implement the concept and an action plan has been proposed.

Le vivant et le recyclage des matériaux de chantier, facteurs de résilience environnementale et de lien social

Konferenz ArODES

Eric Amos, Bernd Domer, Francine Laferrière, Dario Redaelli, Damien Varesano, Marco Viviani

Proceedings of 20. Status-Seminar "Forschen für den Bau im Kontext von Energie und Umwelt", Zurich, Switzerland, 6-7 September 2018

Link zur Konferenz

Zusammenfassung:

L’impact sur le plan social, écologique et économique de la construction d’habitats, de bâtiments administratifs et industriels, d’infrastructures de transport et de loisir et leurs aménagements, n’est plus à démontrer. Épuisement des ressources naturelles, transformation des matériaux, transports, gestion des déchets de chantier et d’excavations, autant de sources d’émissions de GES et d’effets négatifs sur le sol et le paysage qui influent sur la qualité de vie et les perspectives d’avenir de la population, à l’échelle du territoire, de la ville, du quartier. Cette présentation aborde la question de la prise en compte du vivant dans une démarche d’optimisation de la qualité de notre environnement, dimension encore trop souvent sous-estimée dans le processus de la construction et véritable enjeu de ce début de 21e siècle. 1. L’impact écologique : tenir compte du sol, non comme un matériau inerte, socle physique aux seules qualités de support, mais comme un complexe vivant de grande valeur et grande fragilité, rare et indispensable à la végétation et à la gestion des eaux. Le sol fertile se raréfie en milieu bâti, dans la ville en particulier où l’anthroposol et les revêtements imperméables deviennent la règle. 2. L’impact social : Mettre en relation les acteurs du site, une responsabilité sociale. La prise en compte des personnes, habitants actuels et futurs, voisins, la population dans son ensemble et les visiteurs, tous impactés de près ou de loin par les nuisances des travaux, la transformation des lieux, la perte d’éléments repères et à la recherche affirmée et croissante d’une qualité de vie en espace construit.

Design space of modular slab systems with discrete stiffness distribution and irregular column layout

Konferenz ArODES

Alex Muresan, Jan Brütting, Javier Cañada, Dario Redaelli, Corentin Fivet

Proceedings of the IASS symposium 2018, creativity in structural design, 16-20 July 2018, MIT, Boston, USA

Link zur Konferenz

Zusammenfassung:

A known challenge of modular structural systems is to avoid the oversizing of its elements while allowing a wide variety of spatial layouts. Considering any given floor outline and the availability of square slab elements with three discrete bending and shear stiffness, this paper explores: 1) the minimal geometric and topological rules that ensure a positioning of columns satisfying serviceability requirements; and 2) for a given satisfying positioning of columns, the distribution of slab elements that minimizes the overall weight of the system. This study is part of a larger project aimed at developing a highly flexible floor system whose element dimensions do not constrain the positioning of the columns nor the shape of the floor plan. Hence, the structural system could be adapted over time to changing architectural needs.

Structural behavior of prestressed ultra-high performance fibre-reinforced concrete beams with and without openings :

Konferenz ArODES

comparison between experimental results and finite element modelling techniques

Dario Redaelli, Joanna Yared Nseir

Proceedings of FRC 2018 - 3rd ACI-fib-RILEM Workshop on fibre reinforced concrete: from design to structural applications, 28-30 June 2018, Desenzano, Lake Garda, Italy

Link zur Konferenz

Zusammenfassung:

This paper presents the results of a numerical study carried out by the authors to better understand the structural behavior of prestressed beams with a complex geometry and to identify numerical modelling techniques that allow to adequately predict such behavior. UltraHigh Performance Fibre Reinfored Concrete (UHPC) beams with and without openings are considered, with a focus on shear controlled failure modes. For all the beams considered in this study, prestressing is used to resist the main bending moment. However, no other reinforcement is added to the beams in order to emphasize the structural contribution of the fibers and to focus on solutions that could be economically competitive for the precast industry. The results of non-linear simulations performed with existing finite elements codes are compared and validated against experimental results of tests carried out at the University of Applied Sciences of Western Switzerland. The main assumptions of the numerical simulations are discussed, as well as the results and the limits of the analysis.

2016

Seismic retrofitting of masonry walls with thin UHPFRC layers

Konferenz ArODES

Mylène Devaux, Dario Redaelli, Jonathan Moix

Proceedings of Conference: HiPerMat - 4th International Symposium on Ultra-High Performance Concrete and High Performance Construction MaterialsAt, 9-11 Mars 2016, Kassel, Germany

Link zur Konferenz

Zusammenfassung:

Brick masonry is one of the most competitive technologies for the construction of walls in residential buildings. However, the structural response of masonry walls under seismic action has major drawbacks: a relatively low resistance to horizontal forces and a limited ductility. Several strengthening techniques already exist for masonry walls, such as the use fiber-reinforced plastics (FRP) systems. However, the effectiveness of these techniques can be limited by structural problems (e.g. debonding), complex in situ application, or their cost. An alternative strengthening technique is currently explored at the School of Engineering and Architecture of Fribourg, namely the application of thin layers of ultra-high performance fiber-reinforced concrete (UHPFRC) to improve the strength and ductility of masonry walls. The experimental results of a first test series on real-scale masonry walls reinforced with different arrangements of UHPFRC layers are presented below.

Errungenschaften

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Redaelli Dario

Professeur HES associé

Hauptkompetenzen

Ingenierie structurale

Construction en béton armé

Béton fibré ultra-performant

Professeur HES associé