Analytical Prediction and Finite-Element Simulation of the Lateral Response of Rocking Steel Bridge Piers with Energy-Dissipating Steel Bars
Publication: Journal of Structural Engineering
Volume 144, Issue 11
Abstract
This paper presents the extension of controlled rocking technology to steel bridge piers through analytical expression and finite-element (FE) simulation. As an outcome of the rocking behavior, the seismic damage is prevented due to reduced flexural stresses in the columns. However, local buckling can happen if the column wall thickness is too thin, which has detrimental impacts, including the loss of self-centering ability and reduced lateral load/deformation capacity. A simple analytical method is proposed to predict the monotonic rocking response for preliminary design purposes. When using more-detailed models and FE analysis, it is shown that localized inelastic deformations of the column can occur upon rocking and the simple force distribution at the column base can cause an overestimation of lateral load capacity. The use of a base plate can lead to a higher lateral load capacity and less damage to the column by improving the stress distribution at the base of the column. To account for the base plate, previously proposed modified monolithic beam analogy (MBA) was expanded in this study, referenced as extended MBA (EMBA) to predict the rocking column lateral load-displacement response. An optimized design can be achieved with a lighter cross section in the upper part of the column where longitudinal straining is limited. Different axially yielding elements comprised of tension-only, tension-compression, and buckling-restrained energy dissipators (EDs) are investigated. For EDs with comparable force capacities, the study indicates that energy dissipation is increased from the former to the latter dissipator type, while the lateral load capacity of the system remains almost the same. The proposed pier exhibits recentering capability, high ductility, and stable hysteretic response with the majority of damage confined within external sacrificial elements.
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Acknowledgments
The research reported herein was funded by Natural Sciences and Engineering Research Council of Canada (NSERC) under Engage and Collaborative Research and Development (CRD) grants. A financial contribution from Canadian Institute of Steel Construction (CISC) through a Research Grant is also acknowledged. The authors would like to acknowledge CMC Microsystems for the provision of products and services that facilitated this research, including ANSYS Multiphysics. The support provided by WestGrid and Compute Canada is also gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 144 • Issue 11 • November 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jan 4, 2018
Accepted: Jun 5, 2018
Published online: Sep 11, 2018
Published in print: Nov 1, 2018
Discussion open until: Feb 11, 2019
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