EFFECT OF GLOBAL BUCKLING AND DISTORTIONAL BUCKLING ON EFFECIVE AREA OF LIPPED CHANNEL MEMBER

Abstract

A lipped-channel member is a steel member made of thin steel strip, and it sometimes occurs a local buckling before reaching its maximum strength. The current design code considers the effect of local buckling by employing the effective width method, and the effective cross-sectional area is evaluated using the yield stress of the steel material. However, when the lippedchannel member reaches its maximum strength under axial compression, the maximum stress at the cross-section is typically lower than the yield stress due to the effects of global buckling and distortional buckling. Therefore, this paper investigates the effective cross-sectional area of axially compressed lipped channel members. Through axial compression tests, we found that the effective area of axially compressed lipped channel members can be more accurately assessed by using the maximum stress at the cross-section compared to that based on the yield stress.