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A steel channel is used as a purlin of a truss. The top chord of the truss is inclined at a slope of 1 vertical to 4 horizontal and the distance between the trusses is equal to 6m. The purlin has a weight of 79 N/m and is spaced at 1.2m on centers. The dead load including the roof materials is 720 Pa, the live load is known to be 1000 Pa and it is subjected to a wind load of 1440 Pa. The coefficient of pressure at leeward and windward are 0.6 and 0.2 respectively. Properties of C200 x 76mm Sx 6.19x10^4 mm^3. Sy = 1.38x10^4 mm^3 W = 79 N/m Allowable bending stress • Fbx = Fby = 207 MPa Assume all loads passes through the centroid. Determine the maximum bending stress for a load combination of 0.75(D + L + W) 127.11 256.17 181.15 129.06 Determine the maximum ratio of the actual to the allowable bending stress for load combination of 0.75(D+ L+W). O 0.90 1.25 1.54 1.38 Determine the bending stress along the weaker axis for a load combination of 0.75(D + L + W). 127.11 170.73 169.48 130.05

A steel channel is used as a purlin of a truss. The top chord of the truss is inclined at a slope of 1 vertical to 4 horizontal and the distance between the trusses is equal to 6m. The purlin has a weight of 79 N/m and is spaced at 1.2m on centers. The dead load including the roof materials is 720 Pa, the live load is known to be 1000 Pa and it is subjected to a wind load of 1440 Pa. The coefficient of pressure at leeward and windward are 0.6 and 0.2 respectively. Properties of C200 x 76mm Sx 6.19x10^4 mm^3. Sy = 1.38x10^4 mm^3 W = 79 N/m Allowable bending stress • Fbx = Fby = 207 MPa Assume all loads passes through the centroid. Determine the maximum bending stress for a load combination of 0.75(D + L + W) 127.11 256.17 181.15 129.06 Determine the maximum ratio of the actual to the allowable bending stress for load combination of 0.75(D+ L+W). O 0.90 1.25 1.54 1.38 Determine the bending stress along the weaker axis for a load combination of 0.75(D + L + W). 127.11 170.73 169.48 130.05

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A steel channel is used as a purlin of a truss. The top chord of the truss is inclined at a slope of 1 vertical to 4 horizontal and the distance between the trusses is equal to 6m. The purlin has a weight of 79 N/m and is spaced at 1.2m on centers. The dead load including the roof materials is 720 Pa, the live load is known to be 1000 Pa and it is subjected to a wind load of 1440 Pa. The coefficient of pressure at leeward and windward are 0.6 and 0.2 respectively. Properties of C200 x 76mm Sx = 6.19x10^4 mm^3 Sy = 1.38x10^4 mm^3 W = 79 N/m Allowable bending stress • Fbx = Fby = 207 MPa Assume all loads passes through the centroid. Determine the maximum bending stress for a load combination of 0.75(D + L+W) 127.11 256.17 181.15 129.06 Determine the maximum ratio of the actual to the allowable bending stress for load combination of 0.75(D + L + W). 0.90 O 1.25 1.54 1.38 Determine the bending stress along the weaker axis for a load combination of 0.75(D+ L + W). 127.11 170.73 169.48 130.05 Qu
Transcribed Image Text:A steel channel is used as a purlin of a truss. The top chord of the truss is inclined at a slope of 1 vertical to 4 horizontal and the distance between the trusses is equal to 6m. The purlin has a weight of 79 N/m and is spaced at 1.2m on centers. The dead load including the roof materials is 720 Pa, the live load is known to be 1000 Pa and it is subjected to a wind load of 1440 Pa. The coefficient of pressure at leeward and windward are 0.6 and 0.2 respectively. Properties of C200 x 76mm Sx = 6.19x10^4 mm^3 Sy = 1.38x10^4 mm^3 W = 79 N/m Allowable bending stress • Fbx = Fby = 207 MPa Assume all loads passes through the centroid. Determine the maximum bending stress for a load combination of 0.75(D + L+W) 127.11 256.17 181.15 129.06 Determine the maximum ratio of the actual to the allowable bending stress for load combination of 0.75(D + L + W). 0.90 O 1.25 1.54 1.38 Determine the bending stress along the weaker axis for a load combination of 0.75(D+ L + W). 127.11 170.73 169.48 130.05 Qu
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