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Buckling length of a steel column for fire design

2007; Elsevier BV; Volume: 29; Issue: 10 Linguagem: Inglês

10.1016/j.engstruct.2006.11.015

1873-7323

Fernando Gomes, Paulo Providência, João Paulo C. Rodrigues, I. Cabrita Neves,

Structural Load-Bearing Analysis

The Eurocode 3 part 1-2 gives some simple rules to determine the buckling length lfi of a steel column for fire design. In the case of a braced frame in which each storey comprises a separate fire compartment with sufficient fire resistance, Eurocode 3 suggests that the buckling length may be taken as lfi=0.5L in an intermediate storey and as lfi=0.7L in the top storey, where L is the system length in the relevant storey. Stability analyses for the evaluation of the buckling length and critical load of columns in braced frames show that the Eurocode 3 rule may be rather inaccurate in many practical situations. The authors propose alternative formulas to determine the buckling length at elevated temperatures, as an improvement of the actual rule of the Eurocode 3 part 1.2.