An unbraced frame subjected only to vertical loading cannot experience sidesway.

It is assumed that if sidesway occurs in an unbraced frames, all the columns in the story must sway simultaneously.

The beam-column of A992 steel is part of a braced frame with L = 15 ft, Pu = 350 kip, Mux = 115 kip-ft. A second-order analysis was performed with factored loads and reduced member stiffnesses to obtain the moments and axial force. Bending is about the strong axis. Considering only the following shapes and values obtained from the AISC procedure for LRFD, select the lightest acceptable shape. Let Kx = 1.0, Ky = 1.0, and Cb = 1.0.ShapeValue of AISC interaction equationW12x581.020W12x720.744W12x790.675W12x870.608W12x960.547 

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 1.10, and the multiplier to account for P-Δ effects was determined to be 1.12. Determine the required second-order axial strength, Pr, of the member.Type of analysisPu (kip)Mtop (kip-ft)Mbottom (kip-ft)Nonsway3404531Sway12030105 

The beam-column of A992 steel is part of a braced frame with L = 15 ft, Pu = 310 kip, Mux = 115 kip-ft. A second-order analysis was performed with factored loads and reduced member stiffnesses to obtain the moments and axial force. Bending is about the strong axis. Considering only W14x68, W14x74, and W14x82, use LRFD to select the lightest acceptable shape. Let Kx = 1.0, Ky = 1.0, and Cb = 1.0.

If purlins are placed at the joints of a truss top chord, the top chord is considered a beam-column.

In the equation , the variable α is equal to _____ for ASD.

Determine the value of plastic section modulus, Z, about the horizontal z axis for the section. Let bf = 11 in., d = 24 in., tw = 0.250 in., and tf = 0.750 in.

A W8x31 made of A572 Grade 65 steel is subjected to a maximum bending moment of 100 kip-ft about its x-axis. Determine the maximum magnitude of bending stress in the beam.

Determine the value of the section modulus, S, about the horizontal z axis for the section. Let bf = 13 in., d = 16 in., tw = 0.250 in., and tf = 0.750 in.