Study on Joint Connection Performance of an Innovative Tooth Groove Connection and Vertical Reinforcement Lapping in Reserved Hole
Abstract
:1. Introduction
2. Materials and Methods
2.1. Connection Technology
2.2. Design of Specimen
2.3. Fabrication and Assembly
2.4. Material Properties
2.5. Test Procedure
3. Results and Discussion
3.1. Test Phenomena and Failure Modes
3.2. Load–Displacement Curve
3.3. Ductility
3.4. Steel Strain
4. Simulation
4.1. Finite Element (FE) Modeling
4.2. Model Verification
4.3. Parametric Analysis
4.3.1. Axial Compression Ratio
4.3.2. Vertical Reinforcement Connection Degree
4.3.3. Mortar Strength
4.3.4. Tooth Groove Depth
5. Conclusions
- (1)
- The typical failure mode of the specimens with a tooth groove connection and vertical reinforcement lapping in the reserved hole was the horizontal through-penetrating inclined crack at the tooth groove connection. The distributed reinforcements mainly served a structural role, and the effective stress transfer at the horizontal joint was mainly achieved through the tooth groove interlocking action and the vertical reinforcements and UHPC in reserved holes. This innovative tooth groove connection and vertical reinforcement lapping in reserved hole method showed excellent connection performance, with the advantages of simple structure, convenient positioning, no template, and efficient assembly.
- (2)
- With the increase in the axial compression ratio and vertical reinforcement connection degree, the joint connection performance of the specimens with tooth groove connection and vertical reinforcement lapping in the reserved hole significantly increased. However, when the vertical reinforcement connection degree was too large, the improvement of the joint connection performance was not obvious, and excessive reinforcement would cause waste. It was suggested that the reasonable value of the vertical reinforcement connection degree was 67–100%. In addition, the joint connection performance of the specimens with the reserved circular hole and the rounded rectangle hole was not significantly different and could be selected according to construction needs.
- (3)
- The finite element model of the specimens with tooth groove connection and vertical reinforcement lapping in the reserved hole was established, and its accuracy was verified. Through parameter analysis, it was found that with the increase in mortar strength and tooth groove depth, the joint connection performance improved. The reason was that increasing the mortar strength can improve the bond behavior between the interface of the precast concrete and the mortar, while increasing the tooth groove depth can strengthen the interlocking and friction actions. Considering the issues of hoisting, assembly, and transportation, it was recommended that the reasonable tooth groove depth be 50–100 mm.
- (4)
- In this paper, UHPC with ultra-high mechanical properties and durability was explicitly designated as the grouting material in reserved holes, which come with certain limitations. However, grouting materials with different compressive strengths and fluidities would affect the anchoring effect and grouting compactness of the lapping section. Therefore, the effect of different grouting materials on joint connection performance should be further studied in the future.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Specimen | Reserved Hole Type | Axial Compression Ratio | Vertical Reinforcement Connection Degree |
---|---|---|---|
WP01 | Circular hole | 0 | 4D22 (100%) |
WP02 | Circular hole | 0.1 | 4D22 (100%) |
WP03 | Circular hole | 0 | 4D18 (67%) |
WP04 | Circular hole | 0 | 4D25 (134%) |
WP05 | Rounded rectangle hole | 0 | 4D22 (100%) |
Specification | Yield Strength fy/Mpa | Ultimate Strength fu/Mpa | Elongation δ/% |
---|---|---|---|
D8 | 453.6 | 635.0 | 20.4 |
D12 | 435.4 | 553.0 | 21.6 |
D18 | 447.7 | 625.3 | 28.4 |
D22 | 447.9 | 628.1 | 28.4 |
D25 | 465.8 | 655.6 | 26.3 |
Materials | Dimension/mm | Load/kN | Compressive Strength fc/Mpa |
---|---|---|---|
Mortar | 70.7 × 70.7 × 70.7 | 165 | 50.5 |
UHPC | 100 × 100 × 100 | 1398 | 139.8 |
Concrete | 150 × 150 × 150 | 648 | 28.8 |
Specimen | Fcr/kN | ∆cr/mm | Fy/kN | ∆y/mm | Fp/kN | ∆p/mm | Fu/kN | ∆u/mm | ∆h/mm | μ |
---|---|---|---|---|---|---|---|---|---|---|
WP01 | 60 | 0.12 | 472 | 3.68 | 558 | 9.71 | 461 | 19.00 | / | 5.16 |
WP02 | 120 | 0.19 | 675 | 4.25 | 792 | 7.50 | 528 | 14.40 | 1.8 | 3.39 |
WP03 | 75 | 0.36 | 441 | 4.57 | 552 | 10.26 | 448 | 17.00 | 2.6 | 3.72 |
WP04 | 60 | 0.07 | 493 | 3.60 | 568 | 9.08 | 480 | 19.88 | / | 5.52 |
WP05 | 50 | 0.16 | 477 | 3.65 | 555 | 9.82 | 462 | 19.91 | / | 5.45 |
Specimen | Fy/kN | Fy,s/kN | Fp/kN | Fp,s/kN | Fy,s/Fy | Fp,s/Fp |
---|---|---|---|---|---|---|
WP01 | 472 | 461 | 558 | 560 | 0.98 | 1 |
WP02 | 675 | 713 | 792 | 778 | 1.06 | 0.98 |
WP03 | 441 | 455 | 552 | 555 | 1.03 | 1.01 |
WP04 | 493 | 470 | 568 | 564 | 0.95 | 0.99 |
WP05 | 477 | 463 | 555 | 558 | 0.97 | 1.01 |
Average value | 0.998 | 0.998 | ||||
Coefficient of variation | 0.04 | 0.01 |
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Luo, X.; He, Y.; Chen, Q.; Chen, L. Study on Joint Connection Performance of an Innovative Tooth Groove Connection and Vertical Reinforcement Lapping in Reserved Hole. Materials 2023, 16, 7371. https://doi.org/10.3390/ma16237371
Luo X, He Y, Chen Q, Chen L. Study on Joint Connection Performance of an Innovative Tooth Groove Connection and Vertical Reinforcement Lapping in Reserved Hole. Materials. 2023; 16(23):7371. https://doi.org/10.3390/ma16237371
Chicago/Turabian StyleLuo, Xiaoyong, Yang He, Qi Chen, and Linsong Chen. 2023. "Study on Joint Connection Performance of an Innovative Tooth Groove Connection and Vertical Reinforcement Lapping in Reserved Hole" Materials 16, no. 23: 7371. https://doi.org/10.3390/ma16237371