Experimental Evaluation of a Rocking Damage-Free Steel Column Base with Friction Devices

Fabio Freddi, Christoforos Dimopoulos, Theodore Karavasilis

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Abstract

This paper presents the experimental evaluation of an earthquake-resilient rocking damage-free steel column base, previously proposed and numerically investigated by the authors. The column base uses post-tensioned high-strength steel bars to control its rocking behavior, and friction devices to dissipate seismic energy. It is equipped with a circular steel plate with rounded edges, which is used as a rocking base. The rounded edges prevent stress concentration and damage of the contact surfaces, whereas the circular shape allows rocking toward all plan directions. In contrast to conventional steel column bases, the proposed column base exhibits monotonic and cyclic moment-rotation behaviors that are easily described by analytical equations. This allows the definition of a step-by-step design procedure which ensures damage-free behavior, self-centering capability, and energy dissipation capacity for a target design base rotation. The experimental tests, presented in this study, were conducted under monotonic and cyclic loads demonstrating the damage-free behavior even under large rotations. The experimental results were used to validate the design procedure and to calibrate refined three-dimensional (3D) nonlinear finite-element models that will allow further investigations.

Original languageEnglish
Article number04020217
JournalJournal of Structural Engineering
Volume146
Issue number10
DOIs
Publication statusPublished - 1 Oct 2020

Bibliographical note

Funding Information:
This research is supported by Marie Sklodowska-Curie Action Fellowships within the H2020 European Programme. Any opinions, findings, and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of the European Commission. The authors also gratefully acknowledge the support of Prof. J. Toby Mottram and the work of the technicians of the Structural Testing Laboratory of the University of Warwick: Taylor Arnett and Neil Gillespie.

Publisher Copyright:
© 2020 American Society of Civil Engineers.

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

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