Abstract
Concrete-filled steel tube (CFST) columns are increasingly used in the construction of high-rise buildings which require high strength and large working space especially at lower stories. As compared to reinforced concrete columns, existence of the exterior steel tube not only bears a portion of axial load but also most importantly provides confinement to the infill concrete.with the confinement provided by the steel tube, axial strength of the infill concrete can be largely enhanced.this paper presents the investigation effect of impact load on concrete-filled steel tube columns under fire by numerical simulations using ABAQUS software.the results indicate that the CFST sections with larger confinement factor ξ=1.23 behaved in a very ductile manner under lateral impact. And the sections with smaller confinement factor ξ=0.44 generally behaved in a brittle mechanism.
Highlights
For concrete-filled steel tubes, Prichard and Perry conducted the drop-weight experiment to study the impact response of the confined concrete-filled steel tubes [1]
Prion and Boehme have investigated a number of concrete-filled steel column sections such that the two ends of sections were joints and there was loading on those two points
Huo and et al have performed experiments to examine the strength of concrete-filled steel sections under the effect of impact load with temperature increase up to 400°C. that in this paper, the validity of finite elements’ results are carried out by using the results of tests done by Huo and et al In present article, it is tried to investigate the behavior of concrete-filled steel columns under the effects of both impact loads and burning of it
Summary
For concrete-filled steel tubes, Prichard and Perry conducted the drop-weight experiment to study the impact response of the confined concrete-filled steel tubes [1]. Li et al carried out an experimental investigation and demonstrated impact resistance of concrete-filled steel tubes under axial dynamic loading [3]. Huo and et al have performed experiments to examine the strength of concrete-filled steel sections under the effect of impact load with temperature increase up to 400°C. that in this paper, the validity of finite elements’ results are carried out by using the results of tests done by Huo and et al In present article, it is tried to investigate the behavior of concrete-filled steel columns under the effects of both impact loads and burning of it. In the study of Jing et al, parameters include the concrete strength, cross-section dimension and the thickness of steel tube were considered [11].Jing et al studied on dynamic response of concrete-filled steel tube columns confined with FRP under blast loading. In the study of Jing et al, parameters include the concrete strength, cross-section dimension and the thickness of steel tube were considered [11].Jing et al studied on dynamic response of concrete-filled steel tube columns confined with FRP under blast loading. the results indicate that the constraints of FRP effectively enhance the blast resistance of the column, and the vulnerable parts mainly occur at the middle and two ends of the column. the blast resistance of the column can be enhanced by increasing the number of FRP layers or concrete strength. these results could provide a certain basis for blast resistance design of concretefilled steel tubes confined with FRP [12]
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