We are having an internal company discussion concerning the appropriate application of ACI 318-14 and the design of Sway columns. We are using RAM SS to design the columns, and as a matter, of course, we are conducting a partial second-order analysis. We understand that Bentley's process does not account for the P-δ effect. We are trying to apply section 10.10.6 as called for by 10.10.2.2. The code is not clear on the appropriate K value to use in 10.10.6. A strict reading of the Provisions says use K=1.0, but some here are arguing that since the columns are part of a sway-frame it is not appropriate to use K=1.0. I looked at AISC for some extra understanding and they imply K=1.0 for the calculation of the B1 modifier. I am leery of leaning on this as support since the AISC method is predicated on the use of notional loads. Does anyone have any papers to clarify this or just an opinion regarding the correct K for this case?
Robert Hale, PE
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