An engineer analyzes an unbraced frame and determines the su…

An engineer analyzes an unbraced frame and determines the sum of the required load capacities for all the columns in the frame is 420 kips (unfactored) while the total elastic buckling strength of the same frame is 3,536 kips. From these values, what is the LRFD amplification factor for sidesway moments of the frame?

A W14x82 of A992 steel is to be investigated for use as a be…

A W14x82 of A992 steel is to be investigated for use as a beam-column in an unbraced frame. The length is 13 feet. First-order analyses of the frame were performed for both the sway and nonsway cases. The factored loads and moments corresponding to one of the load combinations to be investigated are given for this member in the following table. The multiplier to account for P-δ effects was determined to be 1.14, and the multiplier to account for P-Δ effects was determined to be 1.21. Determine the required second-order axial strength, Pr, of the member.Type of analysisPu (kip)Mtop (kip-ft)Mbottom (kip-ft)Nonsway3804516Sway12030100