Abstract
The ABAQUS finite-element analysis platform was used to understand the mechanical behavior of concrete-filled steel tube reinforced concrete (CFSTRC) columns and steel reinforced concrete (SRC) beam plane frames under fire conditions. Thermal parameters and mechanical constitutive model of steel and concrete materials were reasonably selected, the correct boundary conditions were chosen, and a numerical model for the thermal mechanical coupling of CFSTRC columns and SRC beam plane frame structure was established. The finite-element model was verified from related experimental test results. The failure modes, deformation, and internal force distribution of the CFSTRC column and SRC beam plane frames were analyzed under ISO-834 standard fire conditions and with an external load. The influence of beam and column fire-load ratio on the fire resistance of the frame structure was established, and the fire-resistance differences between the plane frame structures and columns were compared. The CFSTRC column-steel reinforced concrete beam plane frame may undergo beam failure or the column and beam may fail simultaneously. The frame structure fire-resistance decreased with an increase of column and beam fire-load ratio. The column and beam fire-load ratio influence the fire resistance of the frames significantly. In this numerical example, the fire resistance of the frames is less than the single columns. It is suggested that the fire resistance of the frame structure should be considered when a fire-resistant structural engineering design is carried out.
Highlights
Concrete-filled steel tube reinforced concrete (CFSTRC) column and steel reinforced concrete (SRC) beam plane frame structures are composed of joined CFSTRC columns and SRC beams. is type of frame structure combines all advantages of CFSTRC columns and SRC beams perfectly and so has been applied extensively to high-rise and superhigh-rise buildings [1]
Ding et al [10] analyzed the capacity of steel frame columns on fire and considered that the axial force of the steel beams has an adverse effect on the fire resistance of frame columns
Compared with the single CFSTRC column, the overall fire resistance of the composite column frame structure was less than that of the CFSTRC column members because the temperature deformation of the composite column frame structure under fire was constrained by adjacent members, and the boundary conditions of the frame columns were changing constantly. e changing boundary conditions usually accelerated composite column frame structure failure, but the boundary conditions were invariable in the single CFSTRC column, so the fire resistance of the composite column frame structure was less than that of the single CFSTRC column
Summary
Concrete-filled steel tube reinforced concrete (CFSTRC) column and steel reinforced concrete (SRC) beam plane frame structures are composed of joined CFSTRC columns and SRC beams. is type of frame structure combines all advantages of CFSTRC columns and SRC beams perfectly and so has been applied extensively to high-rise and superhigh-rise buildings [1]. Wu et al [14] studied the mechanical behavior of reinforced concrete spatial frames with special-shaped columns on fire and inspected the failure modes and deformation of key parts of reinforced concrete frame structures. Wang et al [15, 16] studied the failure modes, failure mechanism, deformation, and redistribution of internal force of concrete-filled steel tubular column-steel beam plane frames under local fire conditions. Because of the complexity of fire tests and difficulties with measuring internal structural forces, this work considered CFSTRC column-SRC beam frame structures as the analysis object and used a finite-element method to analyze the mechanical properties of the CFSTRC column-SRC beam frame structures under the combined action of load and fire and to provide reference for fire-resistant design of frame structure in projects
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