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Compressive and flexural behaviour of CFRP-repaired concrete-filled steel tubes after exposure to fire
Authors:Zhong Tao  Lin-Hai Han  Ling-Ling Wang
Affiliation:a College of Civil Engineering, Fuzhou University, Gongye Road 523, Fuzhou, Fujian Province, 350002, People’s Republic of China
b Department of Civil Engineering, Tsinghua University, Beijing, 100084, People’s Republic of China
c Key Laboratory of Structural Engineering and Vibration of China Education Ministry, Tsinghua University, Beijing, 100084, People’s Republic of China
Abstract:This paper presents the results of axial compression and bending tests of fire-damaged concrete-filled steel tubes (CFST) repaired using unidirectional carbon fibre reinforced polymer (CFRP) composites. Both circular and square specimens were tested to investigate the repair effects of CFRP composites on them. The test results showed that the CFRP jackets enhanced the load-bearing capacity of the stub columns effectively. Enhancement of the columns’ stiffness due to the CFRP jackets was also observed. However, for beams, the test results demonstrated that the repair effect was not as good when compared with that for stub columns. From the test results, it is recommended that other appropriate repair measures should be taken in repairing severely fire-damaged CFST beams, or those members subjected to comparatively large bending moments.
Keywords:Composite columns  Composite beams  FRP  Post-fire  Residual strength  Concrete-filled steel tubes  Repairing
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