Analysis on mechanical behavior of planar frame with concrete-filled steel tubular columns after exposure to overall stage fire

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (11) : 124-129.

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Analysis on mechanical behavior of planar frame with concrete-filled steel tubular columns after exposure to overall stage fire

WANG Jing-xuan, WANG Wen-da

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Abstract

In order to study systematically the fire resistance of Concrete-Filled Steel Tubular(CFST) structure, this paper presents a Finite Element (FE) model of the planar composite frames with CFST columns and steel and concrete composite beam exposure to overall stage fire based on ABAQUS. The reasonable thermal and material models of steel and concrete were used in the FE model. The FE model was verified by the others’ experimental results. The lateral load (P) versus lateral displacement (Δ) relationships and parametric study of the composite frames were caculated under combined loading and temperature including heating and cooling phases, which followed the ISO-834 standard fire curve. The results show that the ultimate bearing capacity and initial stiffness of the composite frames were reduced due to the high temperature. The axial displacement of columns was decreased during the cooling stage. The fire load ratio of column, depth of fire protection and slenderness ratio of column have significant effects on the load (P) versus displacement (Δ) curves.

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Concrete-Filled Steel Tube (CFST) / composite frame / Finite Element Method (FEM) / overall stage fire / mechanical behavior / parametric study

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WANG Jing-xuan;WANG Wen-da. Analysis on mechanical behavior of planar frame with concrete-filled steel tubular columns after exposure to overall stage fire[J]. Journal of Vibration and Shock, 2014, 33(11): 124-129