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Steel and Composite Structures Volume 39, Number 2, April25 2021 , pages 189-200 DOI: https://doi.org/10.12989/scs.2021.39.2.189 |
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Compressive strength of circular concrete filled steel tubular stubs strengthened with CFRP |
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Jialing Ou and Yongbo Shao
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| Abstract | ||
| The compressive strength of circular concrete filled steel tubular (C-CFST) stubs strengthened with carbon fiber reinforced polymer (CFRP) is studied theoretically. According to previous experimental results, the failure process and mechanism of circular CFRP-concrete filled steel tubular (C-CFRP-CFST) stubs is analyzed, and the loading process is divided into 3 stages, i.e., elastic stage, elasto-plastic stage and failure stage. Based on continuum mechanics, the theoretical model of C-CFRP-CFST stubs under axial compression is established based on the assumptions that steel tube and concrete are both in three-dimensional stress state and CFRP is in uniaxial tensile stress state. Equations for calculating the yield strength and the ultimate strength of C-CFRP-CFST stubs are deduced. Theoretical predictions from the presented equations are compared with existing experimental results. There are a total of 49 tested specimens, including 15 ones for comparison of yield strength and 44 ones for comparison of ultimate strength. It is found that the predicted results of most specimens are within an error limit of 10%. Finally, simplified equations for calculating both yield strength and ultimate strength of C-CFRP-CFST stubs are proposed. | ||
| Key Words | ||
| circular CFRP-concrete filled steel tubular (C-CFRP-CFST) stubs; theoretical model; yield strength; ultimate strengt | ||
| Address | ||
| Jialing Ou: School of Mechanical Engineering, Southwest Petroleum University, Xindu Avenue 8#, Xindu District, Chengdu 610500, China Yongbo Shao: School of Civil Engineering and Geomatics, Southwest Petroleum University, Xindu Avenue 8#, Xindu District, Chengdu 610500, China | ||