Description du projet
Réponse sismique résiliente de structures en béton armé avec des barres d’armature en alliage à mémoire de forme
La plupart des structures construites pour résister aux tremblements de terre reposent actuellement sur des murs en béton armé qui concentrent les dommages dans une zone, généralement à la base de ces murs. Si cette méthode permet d’éviter les effondrements et de sauver des vies, elle endommage souvent le bâtiment à tel point qu’il doit être démoli après un séisme. Le projet SMA-RC-Walls, financé par l’UE, vise à tester des murs avec des barres d’armature en alliage à mémoire de forme (SMA pour «shape-memory alloy»), qui leur permet de reprendre leur forme initiale après des sollicitations sismiques, et donc de prévenir les dommages et d’éviter le basculement permanent des structures. Les chercheurs mèneront des expériences en utilisant des armatures en SMA à base de fer dans les zones limites des murs en béton pour remplacer les habituelles barres d’armature en acier. L’objectif est de contribuer à la constitution d’un parc immobilier plus robuste et plus résilient à l’échelle internationale, et de fournir des orientations pour la conception et l’évaluation sismiques à l’aide de cette nouvelle technologie.
Objectif
The current seismic design philosophy of reinforced concrete (RC) walls typically requires large inelastic strains and damage to accumulate in a plastic hinge region, which can result in post-event residual building displacements. Often, the residual displacements will be in such excess that the building is required to be demolished. This costly but expected performance level (i.e. no collapse, life safe) is currently under scrutiny and instead a serviceable structure with limited damage is warranted by the building owners and engineers in the event of a large earthquake. To achieve these targets, engineers will have to implement better structural technologies. Shape memory alloys (SMAs) have the capability to recover displacements upon removal of stress and dissipate energy through hysteretic damping. This project investigates the efficacy of iron-based SMA bars as a substitute material for typical steel in the boundary regions of RC walls to reduce residual displacements and improve the seismic performance. This interdisciplinary research will be carried out at the Universite catholique de Louvain, Belgium, under the supervision of Professor Joao Almeida in the Institute of Mechanics, Materials and Civil Engineering. An extensive experimental program is proposed, which subjects large-scale RC wall specimens detailed with iron-based SMA bars to quasi-static reverse cyclic in-plane loading. The experimental results will be used to validate state-of-the-art finite element models to undertake an extensive parametric study. Recommendations will be provided on limiting the residual displacement of RC wall buildings, which is aligned with the next generation of Eurocode 8 guidelines. The outcomes of this proposed research have the potential to achieve a more robust building stock internationally, increase community resilience, and promote research and technology development for natural disaster impact reduction measures.
Champ scientifique
- engineering and technologycivil engineeringstructural engineeringearthquake engineeringseismic loading
- natural sciencesearth and related environmental sciencesgeologyseismology
- natural sciencesearth and related environmental sciencesphysical geographynatural disasters
- humanitiesphilosophy, ethics and religionphilosophy
Programme(s)
- HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA) Main Programme
Régime de financement
HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European FellowshipsCoordinateur
1348 Louvain La Neuve
Belgique