Compute the LRFD elastic critical buckling strength, Pe1, for the W10x88 made from ASTM A992 steel with L = 13 ft, P = 540 kip, M = 280 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 30% dead load and 70% live load. The frame analysis was performed using the requirements for the approximate second-order analysis method meaning that a reduced stiffness was used.

Multistory buildings can consist of a combination of braced frames and moment frames.

In each of the three structural analysis methods, member out-of-plumbness is accounted for by including fictitious lateral loads, called _______ loads, in the load combinations.

For reverse-curvature bending, the ratio of M1/M2 is _______.

Compute the ASD moment amplification factor B1 for the W14x74 made from ASTM A992 steel with L = 15 ft, P = 270 kip, M = 290 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.

An engineer analyzes an unbraced frame and determines the sum of the required load capacities for all the columns in the frame is 485 kips (unfactored) while the total elastic buckling strength of the same frame is 2,413 kips. From these values, what is the ASD amplification factor for sidesway moments of the frame?

Compute the ASD moment amplification factor B1 for the W14x74 made from ASTM A992 steel with L = 14 ft, P = 250 kip, M = 240 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 50% dead load and 50% live load. The frame analysis was performed consistent with the effective length method, so the flexural rigidity was unreduced.

The beam-column of A992 steel is part of a braced frame with L = 15 ft, Pu = 300 kip, Mux = 150 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 ASD, select the lightest acceptable shape. Let Kx = 1.0, Ky = 1.0, and Cb = 1.0.ShapeValue of AISC interaction equationW12x581.554W12x721.138W12x791.032W12x870.929W12x960.835 

Using LRFD, determine the value of the AISC interaction equation for a W8x58 made from ASTM A992. Let L = 16 ft, Kx = Ky = 1.0, and Cb = 1.0. The factored loads are Pnt = 281.2 kip, Mnt = 177.6 kip-ft, The member is part of a braced frame, bending is about the x axis, and the LRFD moment amplification factor has been determined to be B1 = 1.248.

Determine Cb for the member if the moments at the top and bottom are 190 ft-kip and 400 ft-kip, respectively.