City Research Online

Abstract

In this paper, the compressive behavior of circular concrete-filled steel tubular stub columns under freeze-thaw cycles was studied. Influence of different concrete grades and number of freeze-thaw cycles were investigated through experimental study. The results show that with the increase of the number of freeze-thaw cycle, the axial strength of specimens decreases regardless of concrete grade. The axial strength deterioration of the CFST specimens under different freeze-thaw cycles increases with the decrease of concrete strength, so does the reduction of enhancement factor. The ultimate displacement and the ductility indexes of CFST specimens are barely affected by freeze-thaw cycles. Based on the test results, a reduction factor ksr for quantifying the strength reduction of CFST and a factor kcsr for considering the strength degradation of core concrete are proposed to predict the ultimate compressive strength of CFST stub column under freeze-thaw cycles.

Publication Type:	Article
Additional Information:	© 2020 Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Publisher Keywords:	concrete-filled steel tube; axial behavior; stub columns; freeze-thaw; cold region; design standard
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TH Building construction
Departments:	School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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