Influence of Ground Motion Characteristics on Higher-Mode Effects and Design Strategy for Tall Pier Bridges
Publication: Journal of Bridge Engineering
Volume 28, Issue 1
Abstract
Numerous bridges in the mountainous areas of southwest China are constructed with tall reinforced-concrete (RC) piers. This paper presents the influence of higher-mode effects of pier columns on seismic performance in a quantitative manner for, to our knowledge, the first time, while the impact of excitation intensity and the frequency content of input motion, which do not appear to be considered in any previous study, are incorporated as well. Numerical models are developed for three bridges with different pier heights, considering higher-mode effects by comparing the seismic responses computed from multi-degree-of-freedom and single-degree-of-freedom systems. An incremental dynamic analysis method is used to investigate the influence of input intensity, and motions matching different target spectra are employed, showing the effects of frequency components. The analytical results show that when the tall piers remain elastic or experience substantial nonlinearity approaching the ultimate state, the higher-order modes contribute more significantly to the seismic responses, while input excitations with more low-frequency components could generally suppress the effects of higher-order modes. Based on the analysis, seismic design strategies for tall piers are discussed and a novel design scheme using preset plastic region length is proposed, which is demonstrated to be able to limit the range of damage with a negligible increase in maximum curvature demand.
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Acknowledgments
The authors gratefully acknowledge the support of the National Nature Science Foundation of China (Grant Nos. 51908348 and 51878491).
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 28 • Issue 1 • January 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Oct 17, 2021
Accepted: May 31, 2022
Published online: Oct 27, 2022
Published in print: Jan 1, 2023
Discussion open until: Mar 27, 2023
ASCE Technical Topics:
- Bridge design
- Bridge engineering
- Bridges
- Bridges (by material)
- Concrete bridges
- Continuum mechanics
- Design (by type)
- Dynamics (solid mechanics)
- Earthquake engineering
- Engineering fundamentals
- Engineering mechanics
- Excitation (physics)
- Geotechnical engineering
- Geotechnical investigation
- Ground motion
- Hydraulic engineering
- Hydraulic structures
- Motion (dynamics)
- Piers
- Ports and harbors
- Seismic design
- Seismic effects
- Seismic tests
- Solid mechanics
- Structural engineering
- Tests (by type)
- Water and water resources
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