TY - JOUR
T1 - Instability of Thin Concrete Walls with a Single Layer of Reinforcement under Cyclic Loading: Numerical Simulation and Improved Equivalent Boundary Element Model for Assessment
AU - Rosso, Angelica
AU - Jimenez-Roa, Lisandro Arturo
AU - Almeida, Joao Pacheco
AU - Beyer, Katrin
N1 - Funding Information:
The first author is supported by the Swiss National Science Foundation grant 200021_132315 ‘Seismic design and assessment of reinforced concrete core walls - Phase II’. The second author was supported by an ‘EPFL-Univalle’ scholarship and by the ‘SEED Money Grant Latin America 2015ʹ. All contributions are gratefully acknowledged.
Funding Information:
This work was supported by the Schweizerischer Nationalfonds zur F?rderung der Wissenschaftlichen Forschung [200021_132315 ?Seismic design and assessment of reinforced concrete core walls - Phase II?]; ?cole Polytechnique F?d?rale de Lausanne [?SEED Money Grant Latin America 2015?]. The first author is supported by the Swiss National Science Foundation grant 200021_132315 ?Seismic design and assessment of reinforced concrete core walls - Phase II?. The second author was supported by an ?EPFL-Univalle? scholarship and by the ?SEED Money Grant Latin America 2015?. All contributions are gratefully acknowledged.
Publisher Copyright:
© 2020 Taylor & Francis Group, LLC.
PY - 2022/1/2
Y1 - 2022/1/2
N2 - Thin reinforced concrete walls may fail due to out-of-plane instability when subjected to seismic loading. While previous numerical studies on wall instability have focused on the behaviour of members with two layers of vertical reinforcement, this work addresses the response of walls with a single layer of rebars. Such walls are particular prone to out-of-plane failure when subjected to cyclic in-plane loading. The numerical investigations herein performed simulate the aforementioned local behaviour and validate it against experimental measurements. A parametric study on the effect of boundary conditions shows that imposing an out-of-plane displacement or a rotation at the storey height increases the vulnerability to instability. It is also seen that the storey height itself is an influencing variable. The second part of this study proposes an improved equivalent boundary element model for the assessment of wall instability. Existing mechanical models, based on pinned-pinned boundary conditions, represent the boundary element over the height of the plastic hinge. This work shows that such models often underestimate the critical tensile strain triggering out-of-plane failure. A new equivalent boundary element model is proposed where a bilinear axial displacement profile defined a priori is applied. The latter is shown to satisfactorily approximate the vertical strain profile in wall boundary elements and to lead to better estimates of the critical strain triggering out-of-plane failure.
AB - Thin reinforced concrete walls may fail due to out-of-plane instability when subjected to seismic loading. While previous numerical studies on wall instability have focused on the behaviour of members with two layers of vertical reinforcement, this work addresses the response of walls with a single layer of rebars. Such walls are particular prone to out-of-plane failure when subjected to cyclic in-plane loading. The numerical investigations herein performed simulate the aforementioned local behaviour and validate it against experimental measurements. A parametric study on the effect of boundary conditions shows that imposing an out-of-plane displacement or a rotation at the storey height increases the vulnerability to instability. It is also seen that the storey height itself is an influencing variable. The second part of this study proposes an improved equivalent boundary element model for the assessment of wall instability. Existing mechanical models, based on pinned-pinned boundary conditions, represent the boundary element over the height of the plastic hinge. This work shows that such models often underestimate the critical tensile strain triggering out-of-plane failure. A new equivalent boundary element model is proposed where a bilinear axial displacement profile defined a priori is applied. The latter is shown to satisfactorily approximate the vertical strain profile in wall boundary elements and to lead to better estimates of the critical strain triggering out-of-plane failure.
KW - Out-of-plane instability
KW - reinforced concrete thin walls
KW - single layer of reinforcement
KW - shell elements numerical simulation
KW - wall boundary elements
KW - 22/2 OA procedure
U2 - 10.1080/13632469.2019.1691679
DO - 10.1080/13632469.2019.1691679
M3 - Article
VL - 26
SP - 493
EP - 524
JO - Journal of Earthquake Engineering
JF - Journal of Earthquake Engineering
SN - 1363-2469
IS - 1
ER -