LRFD and ASD Compressive Strengths (NSCP 2015) of an I-Shape or an H-shape WITH A SLENDER ELEMENT

If the flange or the web of an I-shaped or an H-shaped rolled steel is too thin, the section subjected to axial compression in danger to experience a state of local instability. That means it is possible to experience a local buckling or wrinkling in that slender element before it reaches its strength based on flexural buckling stress. AISC has provided reduction factors to be considered to reduce the flexural buckling stress of such sections.