Abstract
This paper presents the result of an experimental investigation of axial behavior of concrete-filled double skin steel tubular (CFDST) columns exposed to high temperature under the action of monotonically applied concentric axial loads. The columns were exposed to ASTM E-119 standard fire curve until 600°C and kept constant for two different exposure time (i.e., 60 and 90 minutes). Failure patterns and reduction in strength, ductility and stiffness of CFDST columns are reported. Factors influencing the strength, ductility and stiffness of CFDST columns during fire exposure, i.e., exposure time, temperature of concrete core and temperature of inner steel tube, are also discussed.
Highlights
Concrete-filled double skin steel tubular (CFDST) was first mentioned by Shakir-Khalil in 1990’s [1]
Due to its superior performance than hollow steel structural section (HSS) and concrete-filled steel tubular (CFST) section, CFDST has been used in the legs of offshore platforms in deep water and in the structures which are subjected to ice loading [2]
The results show that CFDST columns can still carry almost 85% of loads even after exposure at 600°C for 90 minutes
Summary
Concrete-filled double skin steel tubular (CFDST) was first mentioned by Shakir-Khalil in 1990’s [1]. Due to its superior performance than hollow steel structural section (HSS) and concrete-filled steel tubular (CFST) section, CFDST has been used in the legs of offshore platforms in deep water and in the structures which are subjected to ice loading [2]. CFDST have been used in a construction of high-rise bridge piers in Japan [2,3] and as a transmission tower in China [4]. CFDST columns have potentials to be used as columns in high-rise buildings. Many researchers have been studying this type of column at ambient temperature. Limited studies have been found on effect of fire exposure on CFDST
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