Bearing capacity of composite columns reinforced by concrete filled steel tube |
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| Authors: | WEI Jian-gang ZHU Pu and CHEN Bao-chun |
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| Institution: | College of Civil Engineering, Fuzhou University, Fuzhou 350108, P. R. China;;College of Civil Engineering, Fuzhou University, Fuzhou 350108, P. R. China;;College of Civil Engineering, Fuzhou University, Fuzhou 350108, P. R. China; |
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| Abstract: | In this study, nine simplified short composite columns consisting of core CFST (concrete filled steel tube) of different diameters and outer reinforced concrete were constructed to study their compressive performance under axial or eccentric compression. The failure mode is characterized by the crush of the outer concrete. The bearing capacity increases at first and then decreases with further increase of the position coefficient. It can be concluded that position coefficient is an important structural parameter that has considerable influences on the ultimate bearing capacity of the composite columns. The outer concrete, steel tubes and longitudinal reinforcement are found to work in a cooperative manner under axial or eccentric compression when the position coefficient is about 0.5. An improved bearing capacity algorithm that takes the position coefficient into account has been proposed based on the experimental and simulation results and current technical specification in China. It has been proven to be precise and safe. |
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| Keywords: | concrete filled steel tube composite column position factor test formula |
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