Abstract
Lateral-torsional buckling is one of the criteria in the design of steel and composite beams in ultimate limit state. This paper deals with lateral-torsional buckling of double-span continuous composite beams subjected to two different loadings. The main objective of the paper is the comparison of the elastic buckling moment values of composite continuous beams performed according to approximation formulas of Mcr,A from codes [2] and different sources [3] to more exact values Mcr,E obtained by computer programs based on finite element method [1P]. The results will be presented in the form of elastic buckling moment ratios Mcr,A / Mcr,E.
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