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Axis 3: Structural applications
Axis 1: Chemo-mechanical micro-structure characterization of composite materials
The new nano- and micro-indentation techniques are used to characterize the properties of materials at the microstructure scale. The potential is enormous for the industrial applications for rapid characterizaing new composites. For example, it is now possible to predict the long-term creep of concrete (30-50 years) with microindentation tests (5-10 minutes).
Axis 2: Multi-scale modeling
Micromechanical tools are developed to upscale the microstrucure property to the overall ones needed to engineers. Such tools take into account porosity and water in concretes as they play an important role in the behavior of concrete (e.g. drying shrinkage is due to the forces of water menisci in the pores capillaries). In addition, models are developed to understand the creep mechanisms associated with water and mechanical coupling (e.g. damage).
Axis 3: Structural applications (a) Modeling and Design of High Performance Fiber Reinforced Concrete Structures, UHPC; (b) Innovative design of wood-concrete structures
(a) We develop finite element models (in open-source code Aster software) developed advanced applications of materials in structures. Ex. We have developed a software to predict the effect of fiber orientation in the UHPF which is currently used for the design of the UHPC cover of the stadium J Bouin in Paris. The defect effect and orientation of the fibers on the flexural behavior and the slabs in UHPC are characterized in laboratory by advanced techniques of image analysis.
(b) Innovative solutions are developed for mixed wood-concrete structures for buildings and bridges, taking into account the economic challenge and the environmental impact
1) Design of the formwork and casting procedure to avoid early age cracking in a single-piece of 33 m length UHPFRC footbridge in Calgary (2008) (Pic 1)
2) Finite Element analysis of the UHPFRC footbridge of the « Pont de Diable” footbridge in Montpellier (2008)” (Pic 2)
3) Finite Element analysis of the footbridge of the muCEM museum “Passerelle” MUCEM Marseille (2008) with architect Rudy Ricciotti with ratio between span and height of about 40. (Pic 3)
4) Finite Element analysis of UHPFRC Blandan footbridge à Lyon (2013) with the concrete slab working in tension. (Pic 4)
5) Finite Element analysis of triangular elemnts of the cover of the stadium “Jean Bouin”, Paris (2014) with architect Rudy Ricciotti (Pic 5)
6) Ongoing experimental investigation and FEM analysis of UHPFRC slab for composite bridges (under going) with IFSTTAR (Paris) - Lafarge (Pic 6)
7) Hopefully, some projects soon in Quebec…
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1) DDuctile-TCS(R) - Version Beta 1.0 released
A practical software to analyze and design mixed composite structures made by a wood beam and concrete slab, which accounts for the non-linearity of the materials and the connection behaviour. The software has been validated on connector shear tests and full scale tests on 5 meter beams in laboratory.
2) K-FRC(R) - under development
You can predict the tensile law of a Fiber Reinforced Concrete simply by assuming the fibre geometry (diameter and length, the fibre property (E-modulus and strength), the cementitious matrix property (E-modulus and toughness) and the fibre distribution.
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3) K-BFUP-FEM(R) - under development
You can use this usermat to model the behaviour of UHPC structures by accounting for the fiber direction. The code has been validated on industrial projects like the Stadium Jean Bouin in Paris and the footbridge of Blendon in Lyon. The subroutine can be easily installed in Code_Aster FEM software (which is freely available by by Energy Departement France: link )
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4) Hyd-Cem(R) - under development
You can predict the hydration and the E-modulus development of concrete at early age by simply giving the mix design and the clinker mineralogy.
Selected publications
JOB OFFERS
Send to luca.sorelli@gci.ulaval.ca:
(i) Doctorat en structures mixtes bois-béton et développement durable: "conception multi-critaire des structures bois-béton". À partir de 05.2014. Liste de candidat ouvert.
si intéressé, envoyer une courriel avec votre CV et 2 lettres de référence
P. Eng., M. Sc. A., Ph. D.