In Steel Framed House, a built-up member is used for stud. Usually, a stud is composed by two light gauges and interconnected by self-drilling screws. In Japan, flexural buckling strength of the light gauge built-up compression member is evaluated by effective slenderness ratio. The formula is based on Bleich’s assumption which was applied for heavy section. From this reason, it is questionable that the formula can be directly applied in light gauge. Firstly, full scale testing were conducted to clarify this issue. Batten type light gauge built-up members were used for specimens in this study. Secondly, the energy equilibrium theory was used to derive flexural elastic buckling strength of the built-up members. Bending moment distribution which were used in this derivation was based on test observation. Moreover, modified effective slenderness ratio was proposed. Finally, supplemental results were obtained from finite element analysis to verify the proposed formula.
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