![]() ![]() A parametric study shows the limits of accuracy and applicability of the unbraced frame alignment chart results from a linear buckling analysis. ![]() The goals of this paper are to point out the practical limitations of the unbraced frame alignment chart effective length approach and to encourage the use of story-based effective length factors. This solution involves several assumptions not necessarily satisfied in a particular practical situation. The unbraced frame alignment chart is a graphical representation in nomograph form of a transcendental equation of a buckling solution of a subassemblage. The K factor is based on the effective length concept where K factors are used to equate the strength of a compression member of length L to an equivalent pinended member of length KL subjected to axial load only. ![]() 81-93.įor design of steel columns in unbraced frames, the current AISC specification commentaries from both LRFD and ASD contain an alignment chart to determine the K factor for a particular column. "K-factors for Unbraced Frames: Alignment Chart Accuracy for Practical Frame Variations," Engineering Journal, American Institute of Steel Construction, Vol.
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