Estimating Seismic Response of RC Piers under Unidirectional and Bidirectional Shaking: A Mechanics-Based Approach
Publication: Journal of Structural Engineering
Volume 146, Issue 7
Abstract
Estimating seismic response of reinforced concrete (RC) structures under bidirectional excitation covering admissible incidence angles is computationally challenging and time-consuming for routine design. Further, such responses are widely scattered because of inherent variability in the characteristics of real records, especially owing to the degradation of RC members under cyclic loading. Hence, to obviate the complexity and tedium of the task, this paper suggests an approach to making an advance estimate of response under both unidirectional and bidirectional shaking for all incidence angles. To this end, response of a RC bridge pier has been computed under a set of near-fault and far-fault records. Important response indices (peak deformation and hysteretic energy) have been presented in nondimensional Π-terms choosing simple structural parameters (yield force and yield displacement) and ground motion characteristics (peak ground acceleration, root mean square acceleration, and mean period of ground motion). Representation of responses in dimensionless form reveals a shape-similar pattern. A regression model developed using these nondimensional Π-terms has been found to perform reasonably well in the statistical sense and hence can be used in practice.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request (model of the bridge pier and ground motions).
Acknowledgments
The authors would like to express their sincere thanks to the anonymous reviewers for their in-depth review, critical comments, and valuable suggestions which have contributed significantly to improve the manuscript.
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Journal of Structural Engineering
Volume 146 • Issue 7 • July 2020
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©2020 American Society of Civil Engineers.
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Received: Jul 23, 2019
Accepted: Dec 30, 2019
Published online: Apr 20, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 20, 2020
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