Research on Confinement Effect of the Outer Steel Tube in Notched Square CFST Columns
Abstract
:1. Introduction
2. Finite Element Model and Verification
2.1. Finite Element Model
2.2. Model Verification
3. Parameter Analysis
3.1. Column Strength–Axial Strain Relations
3.2. Stress States of the Steel Tubes
3.3. Concrete Stresses
3.4. Stress Contours
4. Practical Design Formula
4.1. Parametric Analysis
4.2. Design Formulas
4.3. Calculation Formula Verification
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Section Form | Notched Mode | Formula Form | The Value of k |
---|---|---|---|
Square | Horizontal notch | Nuc = fcAc + kfyAs | 1.2 − 0.2β |
Vertical notch | 1.2 | ||
Diagonal notch | 1.2 − 0.2βsinθ |
Specimen | Nuc,t (kN) | Nuc,FE (kN) | Nuc,t/Nu,FE | Equation (8) | Equation (9) | Equation (10) | |||
---|---|---|---|---|---|---|---|---|---|
Nuc,Eq (kN) | Nuc,t/Nuc,Eq | Nuc,Eq (kN) | Nuc,t/Nuc,Eq | Nuc,Eq (kN) | Nuc,t/Nuc,Eq | ||||
SCN-1 | 2049 | 2013 | 1.018 | 2022 | 1.014 | 2005 | 1.022 | 1800 | 1.138 |
SCN-2 | 1850 | 1852 | 0.999 | 1924 | 0.961 | 1904 | 0.971 | 1675 | 1.104 |
SCN-3 | 2040 | 2006 | 1.017 | 2022 | 1.009 | 2005 | 1.017 | 1800 | 1.133 |
SCN-4 | 1970 | 1927 | 1.023 | 1940 | 1.015 | 1920 | 1.026 | 1690 | 1.166 |
SLN-5 | 2075 | 2065 | 1.005 | 2135 | 0.972 | 2086 | 0.995 | 1927 | 1.077 |
SLN-6 | 2016 | 1997 | 1.010 | 2119 | 0.951 | 2031 | 0.993 | 1912 | 1.055 |
SLN-7 | 1942 | 1925 | 1.009 | 2119 | 0.916 | 1953 | 0.994 | 1912 | 1.016 |
SLN-8 | 2064 | 2071 | 0.997 | 2119 | 0.974 | 2070 | 0.997 | 1912 | 1.080 |
SLN-9 | 1980 | 1999 | 0.991 | 2135 | 0.927 | 2047 | 0.967 | 1927 | 1.028 |
SLN-10 | 1930 | 1938 | 0.996 | 2135 | 0.904 | 1969 | 0.980 | 1927 | 1.002 |
SFT-11 | 2090 | 2067 | 1.011 | 2119 | 0.986 | 2119 | 0.986 | 1924 | 1.086 |
CFSST-S-1 | 966 | 959 | 1.007 | 813 | 1.188 | 808 | 1.196 | 722 | 1.338 |
CFSST-S-2 | 899 | 893 | 1.007 | 797 | 1.128 | 791 | 1.137 | 701 | 1.282 |
Average values | 1.007 | 0.996 | 1.022 | 1.116 | |||||
Dispersion coefficient | 0.009 | 0.078 | 0.065 | 0.096 |
Nuc,FE/Nuc,Eq | Equation (8) | Equation (9) | Equation (10) |
---|---|---|---|
Average value | 1.017 | 1.022 | 1.102 |
Dispersion coefficient | 0.036 | 0.039 | 0.041 |
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Li, B.; Ding, F.; Yu, Y.; Zhang, J.; Huang, Q.; Gong, C.; Wang, H. Research on Confinement Effect of the Outer Steel Tube in Notched Square CFST Columns. Materials 2022, 15, 5161. https://0-doi-org.brum.beds.ac.uk/10.3390/ma15155161
Li B, Ding F, Yu Y, Zhang J, Huang Q, Gong C, Wang H. Research on Confinement Effect of the Outer Steel Tube in Notched Square CFST Columns. Materials. 2022; 15(15):5161. https://0-doi-org.brum.beds.ac.uk/10.3390/ma15155161
Chicago/Turabian StyleLi, Biao, Faxing Ding, Yujie Yu, Jingke Zhang, Qiong Huang, Chenjie Gong, and Haibo Wang. 2022. "Research on Confinement Effect of the Outer Steel Tube in Notched Square CFST Columns" Materials 15, no. 15: 5161. https://0-doi-org.brum.beds.ac.uk/10.3390/ma15155161