Abstract
The objective of this study is to examine the validity of the effective-length factors of columns in a single-story and two-story with three-span, five-span or infinite-span frames calculated by using the stability index (SI) method. Stability index is the ratio of PΔ moment to story-moment and related to the buckling strength. There are 3 types of analytical models which are frames with pinned-base, fixed-base and bottom beams and parameters are stiffness of beams and perimeter columns. The effective length factors obtained by the SI method is compared to accurate ones obtained by the buckling slope deflection method and the accuracy of the SI method is examined. The effect of the difference of the type of frames and analytical parameters on the effective length factor of columns and accuracy of the SI method are shown.
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