Degradation of Axial Ultimate Load-Bearing Capacity of Circular Thin-Walled Concrete-Filled Steel Tubular Stub Columns after Corrosion
Abstract
:1. Introduction
2. Experimental
2.1. Raw Materials and Specimens’ Fabrication
2.2. Experimental Procedure and Testing Parameters
3. Results
3.1. Curves of Loads Versus Displacement
3.2. Failure Modes
4. Discussion
4.1. Effect of Steel Tube’s Corrosion on Specimens’ Relative AULC
4.2. Effect of Diameter-to-Thickness Ratio on Specimens’ Ultimate Compressive Strength
4.3. Effect of Confinement Coefficient on Specimens’ Ultimate Compressive Strength
4.4. Simple AULC Prediction Model for Corroded Specimens
5. Conclusions
- The corrosion of the outer steel tube reduces the AULC and plastic deformation ability of circular thin-walled CFST stub columns, and the high corrosion ratios cause high reduction. The degradation speeds of the AULC of circular thin-walled CFST stub columns are lower than the steel tube’s corrosion rates because of the composite interaction between the steel tube and the core concrete;
- The failure modes of axial circular thin-walled CFST stub columns are mainly shear bulging with slight local outward buckling, regardless of the degree of steel tube’s corrosion because of the limited restraint action of steel tubes on core concrete. Although the core concrete failed in a brittle shear failure mode, the failure mode of the column specimens still belongs to a ductile failure because of the confinement action of the outer steel tube;
- The AULC of a corroded circular thin-walled CFST stub column is closely related to the degree of corrosion of its steel tube, its diameter/thickness ratio and effective confinement coefficient, in which the correlation with the effective confinement factor is the highest. A simple model for predicting the AULC of corroded circular thin-walled CFST stub columns was presented through a regression analysis of the experimental data.
Author Contributions
Funding
Conflicts of Interest
References
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No. | Item | t0 /mm | β /% | t0 – t /mm | Δm /g | I /A | T /h |
---|---|---|---|---|---|---|---|
1 | CSC1-1 | 0.92 | 0 (0) | 0 (0) | 0 | 0 | 0 |
2 | CSC1-2 | 0.92 | 20 (22.8) | 0.18 (0.21) | 340.4 | 2.0 | 162.86 |
3 | CSC1-3 | 0.92 | 50 (48.9) | 0.46 (0.45) | 851.1 | 2.0 | 407.15 |
4 | CSC2-1 | 1.42 | 0 (0) | 0 (0) | 0 | 0 | 0 |
5 | CSC2-2 | 1.42 | 20 (21.8) | 0.28 (0.31) | 510.7 | 2.0 | 244.29 |
6 | CSC2-3 | 1.42 | 33.3 (36.6) | 0.47 (0.52) | 850.2 | 2.0 | 407.15 |
7 | CSC2-4 | 1.42 | 50 (49.3) | 0.71 (0.70) | 1276.6 | 2.0 | 586.8 |
8 | CSC3-1 | 1.92 | 0 (0) | 0 (0) | 0 | 0 | 0 |
9 | CSC3-2 | 1.92 | 25 (25.5) | 0.48 (0.49) | 851.1 | 2.0 | 407.15 |
10 | CSC3-3 | 1.92 | 40 (42.2) | 0.77 (0.81) | 1361.8 | 2.0 | 651.44 |
11 | CSC3-4 | 1.92 | 50 (52.6) | 0.96 (1.01) | 1702.2 | 2.0 | 814.30 |
Item | Experimental Data/kN | Prediction 1/kN | Error 1/% | Prediction 2/kN | Error 2/% |
---|---|---|---|---|---|
CSC 1-1 | 648.8 | 624.3 | 3.8 | 529.6 | −18.4 |
CSC 1-2 | 577.2 | 569.4 | 1.4 | 501.8 | −13.1 |
CSC 1-3 | 505.6 | 512.0 | −1.3 | 470.1 | −7.0 |
CSC 2-1 | 749.7 | 765.2 | −2.1 | 588.3 | −21.5 |
CSC 2-2 | 630.2 | 670.4 | −6.4 | 547.7 | −13.1 |
CSC 2-3 | 619.9 | 611.7 | 1.3 | 520.1 | −16.1 |
CSC 2-4 | 552.2 | 564.9 | −2.3 | 496.5 | −10.1 |
CSC 3-1 | 931.9 | 930.7 | 0.1 | 645.9 | −30.7 |
CSC 3-2 | 780.4 | 760.6 | 2.5 | 582.3 | −25.4 |
CSC 3-3 | 664.4 | 662.9 | 0.2 | 540.7 | −18.6 |
CSC 3-4 | 619.1 | 607.2 | 1.9 | 514.7 | −16.9 |
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Zhang, F.; Xia, J.; Li, G.; Guo, Z.; Chang, H.; Wang, K. Degradation of Axial Ultimate Load-Bearing Capacity of Circular Thin-Walled Concrete-Filled Steel Tubular Stub Columns after Corrosion. Materials 2020, 13, 795. https://doi.org/10.3390/ma13030795
Zhang F, Xia J, Li G, Guo Z, Chang H, Wang K. Degradation of Axial Ultimate Load-Bearing Capacity of Circular Thin-Walled Concrete-Filled Steel Tubular Stub Columns after Corrosion. Materials. 2020; 13(3):795. https://doi.org/10.3390/ma13030795
Chicago/Turabian StyleZhang, Fengjie, Junwu Xia, Guo Li, Zhen Guo, Hongfei Chang, and Kejin Wang. 2020. "Degradation of Axial Ultimate Load-Bearing Capacity of Circular Thin-Walled Concrete-Filled Steel Tubular Stub Columns after Corrosion" Materials 13, no. 3: 795. https://doi.org/10.3390/ma13030795