Abstract
A new stability design method for steel plane frames using second-order elastic analysis is proposed. Although many current design methods are based on the effective buckling length concept, the effective buckling length may not always be obtained accurately. This requires that a stability design method be developed without using the effective buckling length. In this method, the introduction of equivalent initial deflection, which accounts for the reduction in strength due to various initial imperfections, is of the utmost importance. Therefore, a new formula for the equivalent initial deflection is proposed, and a methodology using the curvature of the buckling mode is introduced to allow-for a systematic application of this formula to arbitrary shaped irregular frames. The validity and efficiency of the method are demonstrated by some examples.
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