Techno Press


Steel and Composite Structures   Volume 11, Number 4, August 2011, pages 307-324
DOI: http://dx.doi.org/10.12989/scs.2011.11.4.307
 
Fire performance of concrete-filled steel tubular columns strengthened by CFRP
Zhong Tao, Zhi-Bin Wang, Lin-Hai Han and Brian Uy

 
Abstract     [Full Text]
    With the increasing use of concrete-filled steel tubes (CFST) as structural members, there is a growing need to provide suitable measures for possible strengthening or repair of these kinds of structural elements. Fibre reinforced polymer (FRP) jacketing is a recent method and is particularly attractive in which it does not significantly increase the section size, and is relatively easy to install. Thus, it can be used to enhance strength and/or ductility of CFST members. Very little information is available on the performance of FRP-strengthened CFST members under fire conditions. This paper is an attempt to study the fire performance of CFST columns strengthened by FRP. The results of fire endurance tests on FRP-strengthened circular CFST columns are presented. Failure modes of the specimens after exposure to fire, temperatures in the cross section, axial deformation and fire resistance of the composite columns are analysed. It is demonstrated that the required fire endurance can be achieved if the strengthened composite columns are appropriately designed.
 
Key Words
    concrete-filled steel tubes (CFST); fibre reinforced polymer (FRP); strengthening; columns;insulation; confinement; fire endurance
 
Address
Zhong Tao, Zhi-Bin Wang and Brian Uy : Civionics Research Centre, University of Western Sydney, Penrith, NSW 2751, Australia
Lin-Hai : Department of Civil Engineering, Tsinghua University, Beijing, 100084, China
 

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