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http://dx.doi.org/10.7781/kjoss.2013.25.1.071

Experimental Evaluation of Fire Behavior of High-Strength CFT Column with Constant Axial Load  

Chung, Kyung Soo (Steel Structure Research Division, RIST)
Choi, In Rak (Steel Structure Research Division, RIST)
Kim, Do Hwan (Steel Structure Research Division, RIST)
Kim, Jin Ho (Steel Structure Research Division, RIST)
Publication Information
Journal of Korean Society of Steel Construction / v.25, no.1, 2013 , pp. 71-80 More about this Journal
Abstract
Fire-resistant (FR) test data for a square concrete-filled steel tube (CFT) columns consisting of high-strength steel (fy>650MPa) and high strength concrete (fck>100MPa) under axial loads are insufficient. The FR behavior of square high-strength CFT members was investigated experimentally for two specimens having ${\Box}-400{\times}400{\times}15{\times}3,000mm$ with two axial load cases (5,000kN and 2,500kN). The results show that the FR performance of the high-strength CFT was rapidly decreased at earlier time (much earlier at high axial load) than expected due to high strength concrete spalling and cracks. In addition, a fiber element analysis (FEA) model was proposed and used to simulate the fiber behaviour of the columns. For steel and concrete, the mechanical and thermal properties recommended in EN 1994-1-2 are adopted. Test results were compared to those of numerical analyses considering a combination of temperature and axial compression. The numerical model can reasonably predict the time-axial deformation relationship.
Keywords
concrete filled steel tube; high-strength material; fire resistance; column;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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