Effects of Out-of-Plane Deformation of the Base Plate on the Structural Behavior of an Exposed Column Base
Abstract
1. Introduction
2. Test Study
2.1. Specimens
2.2. Test Setup
2.3. Test Results and Discussion
2.4. Discussion of the Deformation of the Base Plates
2.5. Study of the Equivalent Viscous Damping Ratio
Specimen | heq (%) | Average heq (%) | |||||
---|---|---|---|---|---|---|---|
0.01 rad | 0.02 rad | 0.03 rad | 0.05 rad | ||||
S1 | 7.68 | 13.9 | 16.4 | 23.5 | 15.4 | 16.0 | 20.7 |
S2 | 7.78 | 14.7 | 18.8 | 25.2 | 16.6 | ||
S3 | 16.4 | 23.3 | 28.7 | 35.2 | 25.9 | 25.5 | |
S4 | 15.3 | 23.5 | 28.3 | 33.2 | 25.1 |
3. Analysis of the Base Plate
3.1. Model and Loading Process
3.2. Analytical Results and Discussion
4. Simple Calculation Method for the Yielding Strength of an Exposed Column Base
5. Conclusions
- All the specimens failed in yielding at the base plates of an exposed CFST column base.
- The test results of the relationship between the lateral load and the drift angle showed stability without strength deterioration. The hysteresis characteristics of the specimens with axial force application were origin-oriented, and those of the specimens with no axial force application were spindle-shaped.
- Energy absorption capacities were estimated using the equivalent viscous damping ratio at each step of the drift angle of 0.01, 0.02, 0.03, and 0.05 rad. The ratios increased with cyclical loading. The average value was 20.7%.
- The FEM analysis traced well the test results, revealing the tensile yielding area of the base plates.
- The FEM analysis provided the stress distribution on the base plates when the load versus deformation relationship showed a significant decline at R = 0.01 rad.
- The calculation method for the tensile yielding strength of the base plate of a column base accurately evaluated each test strength. It showed that the assumption of the stress distribution area was reasonable owing to the results of the FEM analysis.
- The simple calculation method proposed in this paper demonstrated high consistency with the test results, suggesting its potential as a practical tool for structural design.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Specimen | σy (N/mm2) | σu (N/mm2) | E (kN/mm2) |
---|---|---|---|
S1 | 348 | 446 | 194 |
S2 | |||
S3 | 352 | 449 | 205 |
S4 |
Specimen | BP (mm) | DP (mm) | t (mm) | σy (N/mm2) | σu (N/mm2) | E (kN/mm2) |
---|---|---|---|---|---|---|
S1 | 220 | 335 | 6.00 | 344 | 440 | 205 |
S2 | ||||||
S3 | 220 | 335 | 5.60 | 294 | 454 | 199 |
S4 |
Specimen | σc (N/mm2) | Ec (kN/mm2) |
---|---|---|
S1 | 47.6 | 31.7 |
S2 | ||
S3 | 49.5 | 30.2 |
S4 |
Test (kN) | Calculation (kN) | Analysis (kN) | Exp./Cal. (%) | Exp./Ana. (%) | |
---|---|---|---|---|---|
S1 | 16.0 | 16.7 | 16.8 | 95.8 | 95.2 |
S2 | 15.8 | 16.8 | 94.6 | 94.0 | |
S3 | 8.69 | 8.41 | 9.23 | 103 | 94.1 |
S4 | 8.54 | 9.23 | 102 | 92.5 |
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Nan, D.; Nakahara, H.; Chan, I. Effects of Out-of-Plane Deformation of the Base Plate on the Structural Behavior of an Exposed Column Base. Buildings 2024, 14, 3881. https://doi.org/10.3390/buildings14123881
Nan D, Nakahara H, Chan I. Effects of Out-of-Plane Deformation of the Base Plate on the Structural Behavior of an Exposed Column Base. Buildings. 2024; 14(12):3881. https://doi.org/10.3390/buildings14123881
Chicago/Turabian StyleNan, Ding, Hiroyuki Nakahara, and Iathong Chan. 2024. "Effects of Out-of-Plane Deformation of the Base Plate on the Structural Behavior of an Exposed Column Base" Buildings 14, no. 12: 3881. https://doi.org/10.3390/buildings14123881
APA StyleNan, D., Nakahara, H., & Chan, I. (2024). Effects of Out-of-Plane Deformation of the Base Plate on the Structural Behavior of an Exposed Column Base. Buildings, 14(12), 3881. https://doi.org/10.3390/buildings14123881