Finite-Element Simulation of the Lateral Response of Posttensioned Base Rocking Steel Bridge Piers
Publication: Journal of Structural Engineering
Volume 148, Issue 9
Abstract
This paper presents the results of a finite-element (FE) study on posttensioned (PT) rocking steel bridge piers, each composed of a circular tubular column, welded end plates, PT strands, and axially yielding steel energy dissipators (EDs), and corresponding chairs. The pier is configured so that it rocks at its base. Previously conducted experiments on five scaled rocking steel columns are summarized. Three-dimensional (3D) continuum FE models of the tested specimens are generated with the objective of verifying the capability of the modeling approach in the simulation of the local and global responses. Strain-controlled cyclic coupon tests were performed to quantify the kinematic and isotropic hardening material parameters. A simplified method is proposed to model the cyclic loss of prestressing because of wedge seating in a typical industry monostrand anchorage system. The FE procedure is then calibrated against the experimental data at the material, component, and global pier levels. A parametric study is conducted to examine the effects of key factors such as material model, P-Delta, base plate dimensions, column diameter-to-thickness and initial axial force ratios, ED chairs, and ED location on the lateral cyclic response. It is demonstrated that, for a given target drift, local buckling and the resulting residual lateral deformations of a rocking steel pier are a function of the diameter-to-thickness and initial axial force ratios of the column and the ED chairs. By the proper selection of these variables, a stable and robust self-centering response can be obtained with minimal damage to the bridge pier.
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Data Availability Statement
Some or all the data presented in this study can be made available by the corresponding author upon reasonable request.
Acknowledgments
The research reported herein was sponsored by the Natural Sciences and Engineering Research Council (NSERC) of Canada under the Collaborative Research and Development (CRD) grant program and several industrial partners, including the Canadian Institute of Steel Construction (CISC), Rapid Span Structures, S-FRAME Software, Emil Anderson Construction, and Klohn Crippen Berger. The support provided by UBC Advanced Research Computing, Compute Canada, and CMC Microsystems is gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 148 • Issue 9 • September 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jul 16, 2021
Accepted: May 9, 2022
Published online: Jul 13, 2022
Published in print: Sep 1, 2022
Discussion open until: Dec 13, 2022
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- Tadesse G. Wakjira, Ahmad Rahmzadeh, M. Shahria Alam, Robert Tremblay, Explainable machine learning based efficient prediction tool for lateral cyclic response of post-tensioned base rocking steel bridge piers, Structures, 10.1016/j.istruc.2022.08.023, 44, (947-964), (2022).