Cyclic Behavior of Central Columns in Subway Stations Subjected to Highly Variable Axial Compression Ratio
Publication: Journal of Structural Engineering
Volume 150, Issue 9
Abstract
The failure mode of concrete columns in subway stations during seismic events can be affected by the dynamic fluctuation of the axial forces. This study conducted quasi-static tests with bidirectional loading on three scaled rectangular columns to investigate the influence of highly variable axial compression ratio (ACR). A detailed analysis was conducted of the impact of the highly variable ACR on the column failure mode, reinforcement strains, and hysteretic behavior, and the repairability assessment was discussed. Numerical analysis of the effect of ACR variations was carried out based on the experimental results. In these experiments, the failure modes of central columns in Dakai Station, Japan, during the Kobe earthquake were reproduced, and three columns exhibited compressive-bending-shear damage and compressive-bending damage. As the ACR varied up to three cycles during one horizontal loading cycle, the hysteresis curve of the columns exhibited notable asymmetry. Furthermore, with a large variation of ACR amplitude, the stirrups of the column were fractured due to excessive shear effects. The bearing capacity, energy dissipation, and stiffness degradation of the columns were significantly adversely affected. A reparability assessment of the columns, based on the distribution of reinforcement strains, residual displacements, and concrete damage, is proposed. The effects of varying frequency and amplitude of different vertical ACRs on the hysteretic behavior of columns were analyzed numerically.
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Data Availability Statement
Some or all data, modes, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research was sponsored by the National Natural Science Foundation of China (Grant No. 52090082) and the Training Program for Excellent Young Innovators of Changsha (kq2107010). This financial support is gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 150 • Issue 9 • September 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jan 10, 2024
Accepted: Mar 26, 2024
Published online: Jun 19, 2024
Published in print: Sep 1, 2024
Discussion open until: Nov 19, 2024
ASCE Technical Topics:
- Analysis (by type)
- Compression
- Compressive strength
- Continuum mechanics
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Failure analysis
- Failure modes
- Forensic engineering
- Infrastructure
- Material mechanics
- Material properties
- Materials engineering
- Rail transportation
- Solid mechanics
- Strength of materials
- Structural behavior
- Structural dynamics
- Structural engineering
- Structural failures
- Subways
- Transportation engineering
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