Performance of Prefabricated Hollow Concrete-Filled Steel Tube Bracings on Transverse Bending: Experimental and Numerical Analyses
Abstract
:1. Introduction
2. The Model Test
2.1. Design and Fabrication of the Experimental Model Specimen
2.1.1. H-CFST Component Model
2.1.2. Hoop Model
2.1.3. Counterforce Structure and Supporting Loading Block
2.1.4. Fabrication of the Experimental Model
2.2. Arrangement of Measuring Points
2.2.1. Arrangement of Strain Measuring Points
2.2.2. Arrangement of Displacement Measuring Points
2.3. Loading Method of the Experimental Model
2.4. Model Test Results and Analysis
2.4.1. Load-Displacement Diagrams of the Experimental Model
2.4.2. Variation of Strains with the Load in the Experimental Model
2.4.3. Failure Mode of the Experimental Model
3. Finite Element Simulations
3.1. Material Data of the FEA Models
3.2. Element Type, Element Mesh, and Boundary Condition
3.3. Constitutive Models
3.3.1. Core Concrete
3.3.2. Outer Steel
3.4. Steel Tube–Concrete Interface
3.5. FEM Results and Analysis
3.5.1. Load-Displacement Diagrams of the Experimental Model
3.5.2. Variation of Strains with Load in the Experimental Model
3.5.3. Failure Mode of the Experimental Model
4. Evaluation of Bearing Capacity
4.1. Bending Capacity of the H-CFST Component
4.2. Bending Capacity of the Hoop
4.3. Bending Capacity of the End Supports
4.4. Bending Capacity of the Experimental Model
4.5. Optimization Design of the H-CFST Bracing
5. Conclusions
- The self-designed hoop component significantly mitigated the strength and stiffness reduction phenomenon at the joint of H-CFST components, ensuring that the prefabricated H-CFST bracing system provides safety comparable to traditional concrete bracing in supporting coastal foundation pits;
- Under transverse bending conditions, the prefabricated H-CFST bracing system exhibited two typical failure modes, i.e., local tensile yielding of the steel tube and tensile cracking of end supports;
- Finite element modeling accurately predicted the failure modes of the bracings and provided a reference for the optimized design;
- The theoretical calculation methods using plane section assumption for the bending capacity of bracing components accurately predicted the bending capacity of each component.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Researchers | Component Form | Stress State | Researchers | Component Form | Stress State |
---|---|---|---|---|---|
Kuranovas and Kvedaras [18] | H-CFST columns | Axial load | Zhong and Xu [16] | H-CFST columns | Axial load |
Han et al. [19] | H-CFST columns | Axial load | Ritchie et al. [20] | H-CFST columns | Blast loading |
Wang et al. [21] | H-CFST columns | Lateral impact | Yu et al. [22] | (H)CFST columns | Axial |
Ouyang et al. [23] | CFST columns | Axial load | Ekmekyapar et al. [24] | CFST columns | Axial load |
Han et al. [25] | CFST columns | Pure torsion | Uenaka and Mizukoshi [14] | CFST beams | Bending-shear |
Zhang et al. [26] | CFST beams | Axial load | Guo et al. [27] | CFST beams | Axial load |
Mizan et al. [28] | CFDST columns | Axial load | Wang et al. [29] | CFDST columns | Pure torsion |
Material | Elastic Modulus/GPa | Tensile Strength/MPa | Compressive Strength/MPa | Density/ (kN/m3) |
---|---|---|---|---|
Q235B circular steel tube | 200.0 | 235.0 | 235.0 | 78.5 |
C80 concrete | 38.0 | 2.2 | 50.2 | 24.5 |
HRB400 rebar | 200.0 | 400.0 | / | 78.5 |
H-CFST Component | Hoop | Column | FEA Model | EXP | |
---|---|---|---|---|---|
The load determining the bending capacity, kN | 130.62 | 477.05 | 293.56 | 147.18 | 150.00 |
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Dong, Z.; Peng, H.; Wang, K.; Liu, T. Performance of Prefabricated Hollow Concrete-Filled Steel Tube Bracings on Transverse Bending: Experimental and Numerical Analyses. J. Mar. Sci. Eng. 2023, 11, 2009. https://doi.org/10.3390/jmse11102009
Dong Z, Peng H, Wang K, Liu T. Performance of Prefabricated Hollow Concrete-Filled Steel Tube Bracings on Transverse Bending: Experimental and Numerical Analyses. Journal of Marine Science and Engineering. 2023; 11(10):2009. https://doi.org/10.3390/jmse11102009
Chicago/Turabian StyleDong, Zizhang, Huadong Peng, Kun Wang, and Tao Liu. 2023. "Performance of Prefabricated Hollow Concrete-Filled Steel Tube Bracings on Transverse Bending: Experimental and Numerical Analyses" Journal of Marine Science and Engineering 11, no. 10: 2009. https://doi.org/10.3390/jmse11102009