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U-shaped reinforced concrete walls with shape memory alloys: large scale tests on LNEC-3D shake table and numerical modelling

Payen, Basile
(2023)

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Payen_58961700_2023.pdf
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Details

Supervisors
Saraiva Esteves Pacheco De Almeida, João ; Hoult, Ryan ; Correia, Antonio
Faculty
Ecole polytechnique de Louvain
Degree label
Master [120] : ingénieur civil des constructions, à finalité spécialisée
Abstract
In the pursuit of advancing our understanding of concrete structure behavior during seismic events and mitigating potential construction pitfalls, the necessity for extensive large-scale experimental tests becomes evident. This master thesis aims to numerically analyse the behavior of two walls that will be tested in a European project denoted ALL4wALL. The two walls of 40 tons and more than 6 m high will be subjected to dynamic loading on the shake table at LNEC in Lisbon. The first wall, UWS1, is designed according to the Eurocode 8 using RC, and the second unit, UWS2, is the exact similar wall, except that the bottom boundary regions of the wall will contain shape memory alloy (SMA), a superelastic material. The primary objective of this experimental campaign is to investigate the impact of SMA in reducing residual displacement and analyse the torsional response of U-shaped walls under bidirectional dynamic loading. To numerically simulate the behavior of these walls, beam-truss modelling was employed and validated according to many previous experimental testing of quasi-static and dynamic planar or non-planar walls. The results of this model validation demonstrated a generally accurate representation of the walls' behavior despite some challenges regarding the influence of the top of the wall on torsion and the inaccurate material model of SMA. This results in modelling and predicting the behavior of UWS1 and UWS2 units under many static and dynamic loading. The inclusion of SMA indeed led to a notable reduction in residual displacement. An analysis of the influence of the position of the masses was also concluding with a reduction of the residual and maximal displacement. These results will have to be validated with the forthcoming results of the ALL4wALL experimental campaign.