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A platform for research: civil engineering, architecture and urbanism
Compressive behavior of circular concrete-filled steel tubular columns under freeze-thaw cycles
Abstract In this paper, the compressive behavior of circular concrete-filled steel tubular stub columns under freeze-thaw cycles was studied. The influence of different concrete grades and number of freeze-thaw cycles were both investigated through experimental study. The results show that with the increase of the number of freeze-thaw cycles, 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 the freeze-thaw cycles. Based on the test results, a reduction factor k sr for quantifying the strength reduction of CFST and a factor k csr for considering the strength degradation of core concrete are proposed to predict the ultimate compressive strength of CFST stub column under freeze-thaw cycles.
Highlights Total 24 circular CFST specimens after freeze-thaw cycles were axially tested. Cycle number and concrete grade have little effect on the failure pattern of the specimens under freeze-thaw cycles. The decrease of concrete strength would increase the strength deteriorations of the specimens. A reduction factor for quantifying the strength of circular CFST stub columns under freeze-thaw cycles is proposed. A factor for considering the strength degradation of core concrete under freeze-thaw cycles is proposed.
Compressive behavior of circular concrete-filled steel tubular columns under freeze-thaw cycles
Abstract In this paper, the compressive behavior of circular concrete-filled steel tubular stub columns under freeze-thaw cycles was studied. The influence of different concrete grades and number of freeze-thaw cycles were both investigated through experimental study. The results show that with the increase of the number of freeze-thaw cycles, 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 the freeze-thaw cycles. Based on the test results, a reduction factor k sr for quantifying the strength reduction of CFST and a factor k csr for considering the strength degradation of core concrete are proposed to predict the ultimate compressive strength of CFST stub column under freeze-thaw cycles.
Highlights Total 24 circular CFST specimens after freeze-thaw cycles were axially tested. Cycle number and concrete grade have little effect on the failure pattern of the specimens under freeze-thaw cycles. The decrease of concrete strength would increase the strength deteriorations of the specimens. A reduction factor for quantifying the strength of circular CFST stub columns under freeze-thaw cycles is proposed. A factor for considering the strength degradation of core concrete under freeze-thaw cycles is proposed.
Compressive behavior of circular concrete-filled steel tubular columns under freeze-thaw cycles
Gao, Shan (author) / Peng, Zhen (author) / Guo, Lanhui (author) / Fu, Feng (author) / Wang, Yonggang (author)
2020-01-05
Article (Journal)
Electronic Resource
English
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