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 |
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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. |
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ISSN: | 2191-9097 2191-9089 2191-9097 |
DOI: | 10.1515/ntrev-2019-0053 |