Analysis of Concrete-encased CFST Beams Under Pure Bending After Exposure to Standard Fire

Abstract

This paper presents the bending behavior of concrete-encased concrete filled steel tube (CFST) beams after exposure to ISO-834 standard fire. A three-dimensional finite element analysis (FEA) modeling is developed for sequentially coupled heat transfer and pure bending by ABAQUS. Two groups (8 specimens) of post-fire concrete-encased CFST beams with different CFST ratio or different time under the standard fire were experimentally investigated and a set of test data were used to verify the FEA modeling. Finally, the predicted curves of moment versus deflection are in good agreement with the test data.