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Column k values in reinforced concrete frames

Column k values in reinforced concrete frames

Column k values in reinforced concrete frames

(OP)
How should column k value be calculated for lower storey column of a moment resisting frame. Since it will have no beams at its lower end.
Another problem is how one decides if the frame is braced or side sway.

RE: Column k values in reinforced concrete frames

I assume you are using the alignment chart method.  The AISC commentary says that G may be taken as 10 for a typical "pinned" connection to the footing and 1 for a fixed connection.

Moment frames are always considered sway frames.  Only assumed sidesway is inhibited with braced frames or shear walls.

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