Comparison of Seismic Demands on RC Bridge Columns Using the AASHTO Guide Specification, DDBA, and Nonlinear Analysis for Shallow Crustal and Subduction Tectonic Regimes
Publication: Journal of Bridge Engineering
Volume 27, Issue 6
Abstract
An accurate estimation of displacement demand is essential to predict structural performance. However, the calculated displacements will vary depending on the analysis procedure. This paper shows the differences between the seismic demands of reinforced concrete (RC) columns calculated by using three analysis procedures: (1) AASHTO Seismic Guide Specifications (SGS); (2) direct displacement–based assessment (DDBA); and (3) nonlinear time history analysis (NLTHA). The demands were evaluated using two different response spectra definitions (3-period and 22-period representations) of the 2018 USGS seismic hazard model for structures located in shallow crustal and subduction tectonic regimes. Nonlinear time history analyses were performed using spectrally matched records for five design spectra from both tectonic regimes. This paper shows that the AASHTO-SGS significantly underpredicts the demands (compared with NLTHA) as the displacement ductility increases. In contrast, the predictions of the DDBA agree well with those of NLTHA, with mean differences of 10% for ductility higher than μΔ = 3. Lastly, equations are proposed to improve the accuracy of displacement demands for the AASHTO-SGS and the DDBA methodologies.
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Acknowledgments
The first author is pleased to acknowledge MINCIENCIAS and the Fulbright Commission in Colombia for a scholarship to pursue his Ph.D. studies in the United States. Financial support from the NC State University and the Alaska Department of Transportation and Public Facilities is also gratefully appreciated.
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Published In
Journal of Bridge Engineering
Volume 27 • Issue 6 • June 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jun 26, 2021
Accepted: Jan 22, 2022
Published online: Mar 28, 2022
Published in print: Jun 1, 2022
Discussion open until: Aug 28, 2022
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Cited by
- Diego R Martinez, Mervyn J Kowalsky, Nonlinear seismic performance of RC bridges using the ESA, EDA, DDBA, and nonlinear analysis with various viscous damping models, Earthquake Spectra, 10.1177/87552930221145435, 39, 1, (242-268), (2023).