Eq Ep

Equation 31.93 gives the same K-factor as the modified Yura approach (Geschwindner 1995). LeMessurier and Lui Methods

Equation 31.91 developed by LeMessurier and Equation 31.95 proposed by Lui (1992) can be used for frames both with and without leaning columns. Since the K-factor expressions (Equations 31.91 and 31.95) were derived for an entire story of the frame, they are applicable to frames with and without leaning columns. AISC Load and Resistance Factor Design Method

The current AISC (1999) Commentary adopts the following two modified effective length factors K for rigidly connected columns. For story stiffness method

K 0.822PU XPu( YDHL)

where p2 EI

0 0

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