Journal
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
Volume 75, Issue -, Pages 32-37Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jcsr.2012.03.001
Keywords
Buckling temperature; Steel column; Calculation approach; Fire resistance; Professional factor or model error; Probabilistic distribution
Funding
- Ministry of Science and Technology of China [SLDRCE08-A-06]
- National Natural Science Foundation of China [50738005]
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In current Eurocode, the buckling temperature of steel columns can be calculated by either using an analytical approach or using a simple closed-form equation. This paper investigates the accuracy and limitations of those two calculation approaches. Test data on steel columns at elevated temperature reported in literature are used for comparison. The two approaches are found to give acceptable prediction for tests with moderate utilization factor, and unacceptable prediction for tests with either high utilization factor (mu(0) > 0.83) or low utilization factor (mu(0) < 0.16). The professional factor for the simple equation has a mean of 0.949 and a COV of 0.016, and can be best described by an extreme value distribution. The professional factor for the analytical approach has a mean of 1.018 and a COV of 0.013, and can be well described by either a normal, gamma or lognormal distribution. (C) 2012 Elsevier Ltd. All rights reserved.
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