Rotational Stiffness Investigation and Parametric Analysis of a Novel Assembled Joint in Lattice Shells
Abstract
:1. Introduction
2. Experimental Program
2.1. Specimens
2.2. Experimental Loading and Measurement Scheme
3. Experimental Results and Analysis
3.1. Experimental Phenomena
3.2. Moment–Rotation Curve
4. Verification of FE Models
4.1. FE Models
4.2. FEA Results
5. Parametric Analysis of the Rotational Stiffness of FSA Joint
5.1. Mechanical State of Fan-Shaped Assembled Joint under Out-of-Plane Bending
5.2. Influence of Bolt Spacing
5.3. Influence of the Number of Bolts
5.4. Parameter Value Suggestions
- (1)
- To ensure the joint has a reasonable size, increasing the bolt spacing can increase the bending stiffness and capacity of the joint. The value of the bolt spacing should be based on the specific joint and should not be too small. It is suggested that the minimum h is the section height of the rectangular member.
- (2)
- With an increase in the number of bolts, the ultimate bending moment and initial stiffness of the joint are improved. Considering the joint’s details and degree of construction difficulty, three bolts are recommended for joints with a size close to that of the specimens described in this paper.
6. Theoretical Analysis of the Rotational Stiffness of the Assembled Joint
6.1. Analysis Model
- (1)
- Rotational angle θ1 caused by bolt hole wall;
- (2)
- Rotational angle θ2 caused by the deformation of the outer arc plate of the fan-shaped component.
6.2. Derivation of Stiffness k1
6.3. Derivation of Stiffness k2
6.4. Joint Initial Rotational Stiffness and Test Verification
7. Conclusions
- (1)
- The fan-shaped assembled joint shows semi-rigid characteristics, and the specimen experiences three stages: (1) the elastic stage (0–81.5 kN·m), in which the joint shows good bending performance; (2) the elastic–plastic stage (81.5–142.6 kN·m), where the bending stiffness decreases markedly to about half of the initial stiffness, and the rotation increases gradually owing to bolt slippage and deformation of the bolt hole wall; and (3) the plastic failure stage (143–156.5 kN·m), in which the bolt is brittle and the specimen fails, indicating that the key to improving the bending stiffness of the fan-shaped assembled joint is improving the shear strength of the bolt.
- (2)
- The initial rotational stiffness of the FSA joint is about one third of that of the welded joint.
- (3)
- Our parametric analysis shows that the bending stiffness and ultimate moment of the assembled joint increase when the spacing of the bolts and the number of bolts are increased.
- (4)
- The theoretical calculation formula proposed in this paper can approximately simulate the joint initial rotational stiffness of the fan-shaped assembled joint.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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No. | t (mm) | (MPa) | (MPa) | (%) |
---|---|---|---|---|
1 | 8 | 269.52 | 404.29 | 31.23 |
2 | 16 | 274.90 | 433.08 | 31.67 |
3 | 20 | 270.31 | 411.62 | 30.00 |
Parameters | Values |
---|---|
Bolt spacing/mm | 100, 120, 140, 160, 180 |
Number of bolts | 2, 3, 4 |
Method | Joint Initial Rotational Stiffness/kN·m/rad |
---|---|
Calculated by Equation (22) | 3.12 × 103 |
Test | 3.36 × 103 |
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Xu, J.; Zhu, Y.; Wu, J.; Lu, J.; Zhang, Q.; Wang, W. Rotational Stiffness Investigation and Parametric Analysis of a Novel Assembled Joint in Lattice Shells. Buildings 2024, 14, 261. https://doi.org/10.3390/buildings14010261
Xu J, Zhu Y, Wu J, Lu J, Zhang Q, Wang W. Rotational Stiffness Investigation and Parametric Analysis of a Novel Assembled Joint in Lattice Shells. Buildings. 2024; 14(1):261. https://doi.org/10.3390/buildings14010261
Chicago/Turabian StyleXu, Jianshe, Yazhi Zhu, Jin Wu, Jin Lu, Qian Zhang, and Wei Wang. 2024. "Rotational Stiffness Investigation and Parametric Analysis of a Novel Assembled Joint in Lattice Shells" Buildings 14, no. 1: 261. https://doi.org/10.3390/buildings14010261