11-15. Analysis problem in an unbraced frame-using loads and moments obtained using the re- quirements of the Effective Length Method. A W8 x 48 section consisting of 50 ksi steel is used for a 14 ft long beam-column in a one story building frame. It is unbraced in the plane of the frame (x-x axis) but is braced out of the plane of the frame (y-y axis) so that K,= 1.0. K, has been determined to equal 1.67. A first-order analysis has been completed and the results yielded a P load of 52 k and a Pu load of 16 k. The factored Mx moment was found to be 96 ft-k and a factored Max moment of 50 ft-k. The member is pinned at the base, and is laterally braced only at the top and the bottom. There are no transverse loads between the ends and C=1.0. The Psory=104 k and the ratio of Pf/Pstory 1.0. H, the story shear, is equal to 4.4 k, and the drift index (A/L) is 0.0025. Using the LRFD procedure, is the member adequate? (Ans. OK 0.985 LRFD)

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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11-15. Analysis problem in an unbraced frame - using loads and moments obtained using the re-
quirements of the Effective Length Method.
A W8 X 48 section consisting of 50 ksi steel is used for a 14 ft long beam-column in a one
story building frame. It is unbraced in the plane of the frame (x-x axis) but is braced out of
the plane of the frame (y-y axis) so that K, = 1.0. K, has been determined to equal 1.67. A
first-order analysis has been completed and the results yielded a P, load of 52 k and a Pr
load of 16 k. The factored Mx moment was found to be 96 ft-k and a factored Mix moment
of 50 ft-k. The member is pinned at the base, and is laterally braced only at the top and the
bottom. There are no transverse loads between the ends and C=1.0. The Pstory = 104 k and
the ratio of Pmf/Pstory = 1.0. H, the story shear, is equal to 4.4 k, and the drift index (A/L) is
0.0025. Using the LRFD procedure, is the member adequate? (Ans. OK 0.985 LRFD)
Transcribed Image Text:11-15. Analysis problem in an unbraced frame - using loads and moments obtained using the re- quirements of the Effective Length Method. A W8 X 48 section consisting of 50 ksi steel is used for a 14 ft long beam-column in a one story building frame. It is unbraced in the plane of the frame (x-x axis) but is braced out of the plane of the frame (y-y axis) so that K, = 1.0. K, has been determined to equal 1.67. A first-order analysis has been completed and the results yielded a P, load of 52 k and a Pr load of 16 k. The factored Mx moment was found to be 96 ft-k and a factored Mix moment of 50 ft-k. The member is pinned at the base, and is laterally braced only at the top and the bottom. There are no transverse loads between the ends and C=1.0. The Pstory = 104 k and the ratio of Pmf/Pstory = 1.0. H, the story shear, is equal to 4.4 k, and the drift index (A/L) is 0.0025. Using the LRFD procedure, is the member adequate? (Ans. OK 0.985 LRFD)
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