Cyclic Behavior of Anchored Blind-Bolted Extended End-Plate Joints to CFST Columns
Abstract
:1. Introduction
2. Materials and Methods
2.1. Specimen Design
2.2. Testing of Material Properties
2.3. Test Setup
2.4. Displacement Measurement
3. Results
Test Observation and Failure Modes
4. Discussion
4.1. Moment-Rotation Hysteresis Curves
4.2. Moment-Rotation Envelope Curves
4.2.1. Effect of the Steel Tube Wall Thickness on Joint Performance
4.2.2. Effect of the End-Plate Thickness on Joint Performance
4.2.3. Effect of the Local Strengthening Connection Method and Anchorage Method on Joint Performance
4.2.4. Effect of the Steel Beam Section on Joint Performance
4.2.5. Effect of the Stiffeners on Joint Performance
4.3. Classification of the Tested Joints
4.4. Rotational Capacity and Ductility Ratio
4.5. Strength Degradation
4.6. Stiffness Degradation
4.7. Energy Dissipation
5. Finite Element Analysis
5.1. Finite Element Modeling
5.2. Finite Element Analysis and Test Result Comparison
5.2.1. Moment-Rotation Relationship
5.2.2. Failure Mode
5.3. Force Transfer Pattern
6. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Specimen Number | Column Section (mm) | Column Length (mm) | Beam Section (mm) | End-Plate Thickness (mm) | Local Reinforcement | Anchorage Method | Stiffener |
---|---|---|---|---|---|---|---|
SJ-1 | 250 × 5 | 1736 | HN350 × 175 × 7 × 11 | 12 | None | Nut | None |
SJ-2 | 250 × 5 | 1736 | HN350 × 175 × 7 × 11 | 24 | None | Nut | None |
SJ-3 | 250 × 5 | 1736 | HN350 × 175 × 7 × 11 | 12 | With | Nut | None |
SJ-4 | 250 × 5 | 1736 | HN350 × 175 × 7 × 11 | 24 | With | Nut | None |
SJ-5 | 250 × 5 | 1736 | HN350 × 175 × 7 × 11 | 12 | With | None | None |
SJ-6 | 250 × 5 | 1736 | HN300 × 150 × 6 × 9 | 12 | With | Nut | None |
SJ-7 | 250 × 5 | 1736 | HN300 × 150 × 6 × 9 | 24 | With | Nut | None |
SJ-8 | 250 × 5 | 1736 | HN300 × 150 × 6 × 9 | 12 | With | Nut | With |
Steel Component | Thickness (mm) | Es (GPa) | fy (MPa) | fu (MPa) | δ (%) |
---|---|---|---|---|---|
End-plate-2 | 25 | 198.26 | 408.5 | 534.5 | 28.7 |
End-plate-1 | 12 | 197.29 | 399.2 | 562.8 | 25.7 |
Steel tube | 5 | 208.75 | 477.1 | 609.2 | 21.3 |
C-channel | 7 | 192.29 | 395.2 | 567.8 | 27.7 |
Beam flange-1 | 11 | 202.13 | 412.4 | 591.7 | 18.6 |
Beam web-1 | 7 | 202.35 | 412.6 | 593.7 | 24.83 |
Beam flange-2 | 9 | 197.41 | 269.7 | 405.7 | 26.6 |
Beam web-2 | 6 | 192.05 | 254.1 | 397.0 | 30.0 |
Component | Failure Mode I (Specimen SJ-1 and SJ-2) | Failure Mode II (Specimen SJ-3 ~SJ-6, SJ-8) | Failure Mode III (Specimen SJ-7) |
---|---|---|---|
Anchored blind bolt | Partial pull-out | Bolt rupture | Intact |
Tube wall | Bulging deformation | Slight bulging at the bolt holes | Slight bulging at the bolt holes |
Concrete in the panel | Severely damaged | Local concrete crush | Local concrete crush |
Steel beam | No significant plastic hinge of the steel beam | No significant plastic hinge of the steel beam except SJ-8 | Significant plastic hinge of the steel beam |
Specimen Number | My (kN∙m) | θy (mrad) | Mmax (kN∙m) | θmax (mrad) | Mf (kN∙m) | θf (mrad) | μθ | Ki (kN∙m/mrad) |
---|---|---|---|---|---|---|---|---|
SJ-1 | 136.89 | 8.89 | 178.48 | 36.79 | 151.71 | 44.53 | 5.01 | 29.80 |
SJ-2 | 166.03 | 7.10 | 197.26 | 12.35 | 167.67 | 33.14 | 4.66 | 41.04 |
SJ-3 | 136.1 | 7.56 | 178.65 | 27.79 | 153.66 | 38.96 | 5.15 | 35.29 |
SJ-4 | 194.63 | 7.53 | 225.11 | 15.08 | 196.9 | 26.28 | 3.49 | 42.59 |
SJ-5 | 124.21 | 8.16 | 155.44 | 27.87 | 147.28 | 58.08 | 7.11 | 37.30 |
SJ-6 | 92.37 | 9.40 | 118.39 | 34.82 | 100.63 | 46.4 | 4.93 | 21.72 |
SJ-7 | 146.12 | 8.13 | 184.56 | 34.04 | 184.56 | 34.04 | 4.19 | 33.27 |
SJ-8 | 145.65 | 5.83 | 188.19 | 24.51 | 172.95 | 35.76 | 6.13 | 32.12 |
Specimen Number | Ee | ξe | Wtotal (kN∙m) |
---|---|---|---|
SJ-1 | 1.69 | 0.27 | 57.50 |
SJ-2 | 1.77 | 0.28 | 56.82 |
SJ-3 | 1.93 | 0.31 | 36.93 |
SJ-4 | 1.41 | 0.22 | 18.81 |
SJ-5 | 1.64 | 0.26 | 42.10 |
SJ-6 | 1.06 | 0.17 | 21.83 |
SJ-7 | 2.35 | 0.37 | 46.63 |
SJ-8 | 2.33 | 0.37 | 31.19 |
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Wang, Y.; Wang, Z.; Pan, J.; Wang, P.; Qin, J.; Chen, S. Cyclic Behavior of Anchored Blind-Bolted Extended End-Plate Joints to CFST Columns. Appl. Sci. 2020, 10, 904. https://doi.org/10.3390/app10030904
Wang Y, Wang Z, Pan J, Wang P, Qin J, Chen S. Cyclic Behavior of Anchored Blind-Bolted Extended End-Plate Joints to CFST Columns. Applied Sciences. 2020; 10(3):904. https://doi.org/10.3390/app10030904
Chicago/Turabian StyleWang, Yihuan, Zhan Wang, Jianrong Pan, Peng Wang, JianGui Qin, and Shizhe Chen. 2020. "Cyclic Behavior of Anchored Blind-Bolted Extended End-Plate Joints to CFST Columns" Applied Sciences 10, no. 3: 904. https://doi.org/10.3390/app10030904