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K-value for column in Dual System Structure
- Thread starter whymrg
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I would think it depends on which column in the structure is being considered....they do vary within any given structure.
I have always understood that sway is considered IF the lateral stability of the frame DEPENDS on the bending resistance of the column fixed to the beam.
So a column in a moment frame provides the key lateral resistance to the frame and thus, sway occurs in the column and you must consider that as the condition.
For a column in a frame that does not provide frame lateral restraint through bending, then the column is "going along for the ride" and is considered braced by external systems and thus is in a non-sway condition.
In a dual system you still have to look at the contribution of the column to the lateral stability of the structure.
I have always understood that sway is considered IF the lateral stability of the frame DEPENDS on the bending resistance of the column fixed to the beam.
So a column in a moment frame provides the key lateral resistance to the frame and thus, sway occurs in the column and you must consider that as the condition.
For a column in a frame that does not provide frame lateral restraint through bending, then the column is "going along for the ride" and is considered braced by external systems and thus is in a non-sway condition.
In a dual system you still have to look at the contribution of the column to the lateral stability of the structure.
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