Stability Index Evaluation of Slender RC Bridge Columns under Seismic and Gravity Loads
Publication: Journal of Bridge Engineering
Volume 24, Issue 5
Abstract
This study evaluates the stability index of slender RC bridge columns under seismic and gravity loads. Results from this research indicate that current stability indexes used in neglecting P-Δ effects have an associated reliability index that far exceeds values currently proposed in the Caltrans Bridge Design Practice. Reliability indexes were established from a numerical procedure that considered columns with varying ratios of aspect, axial load, and longitudinal and transverse reinforcement. The proposed numerical procedure was extended in defining stability indexes that (1) stipulate threshold limits for neglecting P-Δ effects and (2) define a collapse-prevention criterion. Previous studies have investigated reliability indexes for short and slender RC columns by expressing the limit-state function in terms of design moment magnification and second-order analysis methods. The work presented in this study is a departure from these methods because it determines the reliability index based on a limit-state function that explicitly addresses the ductility level at which RC slender columns reach instability under seismic and gravity loads.
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Acknowledgments
The work presented in this paper is drawn from the collaborative research project between the George Washington University and Michigan State University and was supported by the US National Science Foundation under grant numbers CMS-1000797 and CMS-1000549. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.
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Published In
Journal of Bridge Engineering
Volume 24 • Issue 5 • May 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Apr 5, 2018
Accepted: Sep 26, 2018
Published online: Feb 26, 2019
Published in print: May 1, 2019
Discussion open until: Jul 26, 2019
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