Cyclic Loading for RC Bridge Columns Considering Subduction Megathrust Earthquakes
Publication: Journal of Bridge Engineering
Volume 21, Issue 5
Abstract
Current structural design philosophies rely on the inelastic capacity of structures for resisting seismic excitations. To assess such capacity, cyclic loading protocols have been used as a common practice in laboratory and numerical evaluations. The main objective was to obtain quasi-static loading protocols that reflect the increase in the inelastic demands of bridge columns subjected to long duration ground motions caused by subduction megathrust earthquakes. To study the demands imposed on the structural system, results from nonlinear time-history analyses considering numerous subduction ground motions imposed on structures with a wide range of structural periods and target ductilities were used. Because the number of inelastic cycles and the expected damage can be closely related, statistical analyses of the number of inelastic cycles and the cumulative inelastic demands were used to develop the loading protocols. Due to the observed dependence of the demand parameters on the structural period, different protocols were developed for short-, medium-, and long-period responses. The proposed cyclic deformation histories are more representative of the inelastic demands from subduction earthquakes; therefore, their application would improve the seismic assessment of bridge columns exposed to such hazards.
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Acknowledgments
This paper is based on research funded by the Oregon Department of Transportation (ODOT), the support of which is gratefully acknowledged. The Federico Santa Maria Technical University (UTFSM) and CONICYT PAI/INDUSTRIA 72140358 provided grants for the stay of the first author at Portland State University. 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 sponsors.
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Published In
Journal of Bridge Engineering
Volume 21 • Issue 5 • May 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Nov 6, 2014
Accepted: Nov 6, 2015
Published online: Jan 22, 2016
Published in print: May 1, 2016
Discussion open until: Jun 22, 2016
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