ABSTRACT
According to Megson (1974), there are no clear defined lines between sections which may be regarded as thin and those which may be considered as thick. However, it is suggested in the thinwalled theory, it may be applied with a reasonable accuracy if the sections’ thickness is at least ten times thinner than the cross-section dimensions. Meanwhile, according to Kuang (1984), when the cross-section-to-thickness ratio exceeds 50, this beam is categorized as a thin-walled beam or structure. Another definition of the thin walled beam or structure is based on slenderness ratio (American Iron and Steel Institute, 2002).
