Structures Congress 2018
Analytical Models for Seismic Repair of Bridge Columns Using Plastic Hinge Relocation
Publication: Structures Congress 2018: Bridges, Transportation Structures, and Nonbuilding Structures
ABSTRACT
This paper presents two analytical models, Model Fiber and Model RS, which predict the seismic performance of two repaired specimens using a carbon fiber-reinforced polymer (CFRP) shell and epoxy anchored headed steel bars to relocate the column plastic hinge. In Model Fiber, distributed plasticity considering bond slip is assumed to be concentrated in a plastic hinge length of the nonlinear beam-column element instead of the whole length of the element; this was implemented using the BeamWithHinges element in OpenSees. In Model RS, concentrated plasticity was considered using a non-linear moment rotational spring located at the repaired cross-section. A sectional moment-curvature analysis is performed, based on damaged steel properties and considering bond slip, to obtain the moment-rotation relationship, which is assigned to the non-linear rotational spring. Both analytical models proposed in this paper include low-cycle fatigue of longitudinal steel bars and bond-slip effects. Numerical simulations show that the analytical results, in terms of hysteretic response, cumulative hysteretic energy, and bending moment-rotation, agree with the experimental results.
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ACKNOWLEDGEMENTS
The authors would like to acknowledge the financial support of the Mountain Plains Consortium under contract MPC-491. In addition, they would like to acknowledge the support of MJ Ameli, Mark Bryant, Priyank Sankholkar, Trevor Nye, Anurag Upadhyay, and Joel Parks of the Department of Civil and Environmental Engineering at the University of Utah.
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Published In
Structures Congress 2018: Bridges, Transportation Structures, and Nonbuilding Structures
Pages: 296 - 307
Editor: James Gregory Soules, CB&I
ISBN (Online): 978-0-7844-8133-2
Copyright
© 2018 American Society of Civil Engineers.
History
Published online: Apr 17, 2018
Published in print: Apr 17, 2018
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