Wsh

Pu is the required axial compressive strength of the column under consideration, Y1 Pu is the required axial compressive strength of all columns in a story, D0h is the lateral interstory deflection, Y1H is the sum of all story horizontal forces producing D0h, and L is the story height. The 0.822 factor is the ratio of the lateral column shear force per radian of drift to the buckling load of a sway permitted column with large end restraint, G = 0. This factor will approach 1.0 for more flexible systems with a large percentage of leaner columns.

For the story buckling method

where Y1 Pe2 is the sum of Euler loads of all columns in a story providing lateral stiffness for the frame based on the effective length factor obtained from the alignment chart for an unbraced frame, Pu is the required axial compressive strength for rigid column, and Y1 Pu is the required axial compressive strength of all columns in a story.

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