Mechanical properties of circular nano-silica concrete filled stainless steel tube stub columns after being exposed to freezing and thawing

Experimental research on circular nano-silica concrete filled stainless steel tube (C-CFSST) stub columns after being exposed to freezing and thawing is carried out in this paper. All of forty specimens were tested in this paper, including nine C-CFSST specimens at normal temperature, 28 short colum...

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Veröffentlicht in:Nanotechnology reviews (Berlin) 2019-12, Vol.8 (1), p.600-618
Hauptverfasser: Lin, Qingjie, Chen, Yu, Liu, Chao
Format: Artikel
Sprache:eng
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Zusammenfassung:Experimental research on circular nano-silica concrete filled stainless steel tube (C-CFSST) stub columns after being exposed to freezing and thawing is carried out in this paper. All of forty specimens were tested in this paper, including nine C-CFSST specimens at normal temperature, 28 short columns of C-CFSST for freeze-thaw treatment and three circular hollow stainless steel stub columns. The failure mode, load-displacement curves, load-strain curves and load-bearing capacity were obtained and analyzed in this paper. The main parameters explored in the test include the number of freeze-thaw cycles ( =0, =50, =75, and =100), wall thickness ( =1.0mm, =1.2mm, =1.5mm) andnano-silica concrete strength ( =20MPa, =30MPa, =40MPa). The result shows that C-CFSST short columns at normal temperature and subjected to freezing and thawing follow similar failure mode. The effect of freeze-thaw cycles ( ) of 50 on bearing capacity of C-CFSST column was maximal, and then the influence of on the bearing capacity of specimens was small when reached to 75, finally the effect of on bearing capacity of C-CFSST column was large when reached to 100. The bearing capacity of C-CFSST columns increases with increasing wall thickness. In addition, the loss percentage of bearing capacity of specimens ( =40MPa) for freeze-thaw treatment is maximal, and the loss percentage of bearing capacity of specimens ( =30MPa) for freeze-thaw treatment is minimal. According to the test results, this paper proposed a formula to calculate the bearing capacity of C-CFSST short columns for freeze-thaw treatment.
ISSN:2191-9097
2191-9089
2191-9097
DOI:10.1515/ntrev-2019-0053