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

Steel Design (Activate Learning with these NEW titles from Engineering!)

6th Edition

ISBN:9781337094740

Author:Segui, William T.

Publisher:Segui, William T.

Chapter10: Plate Girders

Section: Chapter Questions

Problem 10.7.9P

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Light-grade steel channel was used as a purlin of a truss. The top chord of the truss is inclined I V : 4 H and distance between trusses is equal to 6 m. The purlin has a weight of 79 N/m and spaced at 1.2 m. on centers. The dead load including the roof materials is 720 Pa, live load of 1000 Pa and wind load of 1.2 1.2 1440 Pa. Coefficient of Purlins pressure at leeward and windward are 0.6 and 0.2 respectively. Assume all loads passes through the centroid of the section. Properties of C 200 x 76 mm Sx = 6.19 x 104 mm Sy = 1.38 x 104 mm3 W = 79 N/m 1.2 Truss 1.2 12 12 1.2 Allowable bending stress Fbr = Fby = 207 MPa Truss %3D 6m O Calculate the bending stress, fox, for dead load and live load combination (D + L). Calculate the bending stress, foy, for dead load and live load combination (D + L). O Calculate the maximum ratio of actual to the allowable bending stress for load combination 0.75 (D + L + W) at the windward side. fbx = 151.14 MPa fby = 169.6 MPa Interaction = 1.25
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