Compute the LRFD moment amplification factor B1 for the W12x106 made from ASTM A992 steel with L = 15 ft, P = 300 kip, M = 210 kip-ft, and Kx = Ky = 1.0. Bending is about the x axis. The member is part of a braced frame, and the given service loads are 40% dead load and 60% live load. The frame analysis was performed using the requirements for the approximate second-order analysis method meaning that a reduced stiffness was used.

Determine Cb for the member if the moments at the top and bottom are 190 ft-kip and 500 ft-kip, respectively.

Using ASD, determine the value of the AISC interaction equation for a W18x65 made from ASTM A992. Let L = 16 ft, Kx = Ky = 1.0, and Cb = 1.0. The factored loads are Pnt = 120 kip, Mnt = 150 kip-ft, The member is part of a braced frame, bending is about the x axis, and the ASD moment amplification factor has been determined to be B1 = 1.024.

Many isolated one-story columns can be realistically treated as _______.

Compute the value of Cm for a beam-column with a moment of 510 kip-ft at the top and a moment of 120 kip-ft at the bottom.

An unbraced beam-column with no moment frames has an Euler buckling strength of 1,771 kips with a story shear of 4.78 kips. What is the drift index for the column?

An engineer analyzes an unbraced frame and determines the sum of the required load capacities for all the columns in the frame is 439 kips (unfactored) while the total elastic buckling strength of the same frame is 3,525 kips. From these values, what is the ASD amplification factor for sidesway moments of the frame?

A W14x82 of A992 steel is to be investigated for use as a beam-column in an unbraced frame. The length is 15 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. Bending is around the strong axis. The effective length factors are Kx = 1.0 for the braced case, Kx = 1.0 for the unbraced case, and Ky = 1.0. The multiplier to account for P-δ effects was determined to be 1.17, and the multiplier to account for P-Δ effects was determined to be 1.29. Using LRFD and Cb = 1.0, determine the value of the AISC interaction equation.Type of analysisPu (kips)Mtop (kip-ft)Mbottom (kip-ft)Nonsway2004023Sway6525110 

An unbraced beam-column with no moment frames has an Euler buckling strength of 2,396 kips with a story shear of 4.50 kips. What is the drift index for the column?

A W14x74 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 1.07, and the multiplier to account for P-Δ effects was determined to be 1.20. Determine the required second-order flexural strength, Mr, at the bottom of the member.Type of analysisPu (kips)Mtop (kip-ft)Mbottom (kip-ft)Nonsway3503520Sway1605095