Seismic Energy Dissipation and Hysteresis Performances of Distinctly Shaped Steel-Reinforced Concrete Column–Beam Joints under Cyclic Loading
Abstract
:1. Introduction
2. Experimental Design and Preparation
2.1. Materials and Specimens
2.2. Loading System and Measurement
3. Test Procedures and Crack Observation
3.1. Specimen JD-1
3.2. Specimen JD-2
3.3. Specimen JD-3
3.4. Specimen JD-4
4. Results and Hysteresis Analysis
5. Seismic Energy Dissipation Analysis
6. Conclusions
- The distinctly shaped column design addresses the limitations of conventional frame columns, where their oversized sections and sharp edges often detract from architectural esthetics. Consequently, this innovative structure holds immense potential for extensive application in practical engineering projects. However, distinctly shaped SRC column joints sometimes fall short in terms of mechanical performance, prompting the urgency to investigate and enhance joint design techniques in order to facilitate the wider acceptance and implementation of these cutting-edge designs. This study involved low-frequency cyclic load tests on the proposed distinctly shaped SRC column beam joints, offering a more precise simulation of bidirectional seismic forces compared to conventional unidirectional testing methods. The proposed testing approach offers a marked improvement over conventional unidirectional testing methods, leading to insightful and practical findings that contribute to our understanding of the seismic behavior of SRC joints.
- It was revealed in this investigation that the design approach for distinctly shaped SRC column–beam joints, incorporating steel tubes and structural steel, exhibits remarkable seismic resilience. The I-steel and tubes positioned at the joints exhibit a positive constraining effect on the core concrete, enhancing both the structural integrity and seismic performance of the overall structure. Additionally, the joint proposed in this study demonstrates reduced stiffness degradation, minimal load-bearing capacity deterioration, and superior ductility under bidirectional low-cyclic reversed-loading conditions, indicating its potential for improved seismic performance.
- This study also delineates the progression of crack formation and subsequent structural collapse. It portrays pertinent hysteresis curves and compares the hysteretic behaviors of SRC joints with those of conventional RC joints. This comparison underscores SRC joints’ more complete hysteresis loops, indicative of their superior energy dissipation efficiency and ductility in contrast to RC joints. Additionally, this study explores the strain hysteresis characteristics of structural steel and tubes under operational settings. Conclusively, the incorporation of structural steel and concrete within the core steel tube is found to significantly bolster the load-bearing capacity of joints during seismic events. Looking ahead, future endeavors may involve incorporating finite element analysis to further investigate the energy dissipation mechanisms of SRC joints.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Symbol | Definition | Unit |
---|---|---|
Diameter | ||
Modulus of elasticity of concrete | (N/mm2) | |
Concrete axial compressive strength | (N/mm2) | |
Concrete axial tensile strength | (N/mm2) | |
Loop rigidity | ||
Cracking load | ||
Damage load | ||
Ultimate load | ||
Yield load | ||
Ultimate displacement | ||
Yield displacement | ||
Elongation | -- | |
Ductility factor | -- | |
Yield strength of steel | (N/mm2) | |
Ultimate strength of steel | (N/mm2) |
Specimen | JD-1 | JD-2 | JD-3 | JD-4 | |
---|---|---|---|---|---|
Cross-section | Beam (mm × mm) | 250 × 450 | 250 × 450 | 250 × 450 | 250 × 450 |
Column | T-type | T-type | T-type | T-type | |
Beam | Longitudinal steel bar | 8B20 | 8B20 | 8B20 | 8B20 |
Stirrup | |||||
Column | I-shaped steel | ----- | |||
Longitudinal steel bar | 12B14 | 12B14 | 12B14 | 12B14 | |
Stirrup | |||||
Round steel | ----- | ||||
Core area | Stirrup |
Specimen | (N/mm2) | (N/mm2) | (N/mm2) | (N/mm2) |
---|---|---|---|---|
JD-1 | 42.87 | 32.58 | 2.35 | 3.32 × 104 |
JD-2 | 44.92 | 34.14 | 2.42 | 3.36 × 104 |
JD-3 | 44.58 | 33.88 | 2.41 | 3.36 × 104 |
JD-4 | 44.95 | 34.16 | 2.42 | 3.36 × 104 |
Specimen No. | Cycle 1 | Cycle 2 | Cycle 3 | Cycle 4 | Cycle 5 | Cycle 6 | Cycle 7 | Cycle 8 |
---|---|---|---|---|---|---|---|---|
JD-2 | 0.058 | 0.144 | 0.163 | 0.199 | 0.265 | 0.195 | 0.159 | 0.124 |
JD-4 | 0.063 | 0.139 | 0.134 | 0.154 | 0.205 | 0.171 | 0.172 | 0.109 |
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Duan, J.; Yang, D.; Liu, X.; Xiang, P. Seismic Energy Dissipation and Hysteresis Performances of Distinctly Shaped Steel-Reinforced Concrete Column–Beam Joints under Cyclic Loading. Buildings 2024, 14, 2777. https://doi.org/10.3390/buildings14092777
Duan J, Yang D, Liu X, Xiang P. Seismic Energy Dissipation and Hysteresis Performances of Distinctly Shaped Steel-Reinforced Concrete Column–Beam Joints under Cyclic Loading. Buildings. 2024; 14(9):2777. https://doi.org/10.3390/buildings14092777
Chicago/Turabian StyleDuan, Junquan, Delei Yang, Xiaochun Liu, and Ping Xiang. 2024. "Seismic Energy Dissipation and Hysteresis Performances of Distinctly Shaped Steel-Reinforced Concrete Column–Beam Joints under Cyclic Loading" Buildings 14, no. 9: 2777. https://doi.org/10.3390/buildings14092777