Light-grade steel channel was used as a purlin of a truss. The top chord of the truss is inclined IV: 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 1440 Pa. Coefficient of 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 mm³ Sy= 1.38 x 104 mm³ W = 79 N/m Allowable bending stress Fbx=Fby = 207 MPa 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). 3 Calculate the maximum ratio of actual to the allowable bending stress for load combination 0.75 (D + L + W) at the windward side. 1.2 1.2 1.2 1.2 fbx = 151.14 MPa fby = 169.6 MPa Interaction = 1.25 Truss 1.2 6m Purlins Truss
Light-grade steel channel was used as a purlin of a truss. The top chord of the truss is inclined IV: 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 1440 Pa. Coefficient of 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 mm³ Sy= 1.38 x 104 mm³ W = 79 N/m Allowable bending stress Fbx=Fby = 207 MPa 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). 3 Calculate the maximum ratio of actual to the allowable bending stress for load combination 0.75 (D + L + W) at the windward side. 1.2 1.2 1.2 1.2 fbx = 151.14 MPa fby = 169.6 MPa Interaction = 1.25 Truss 1.2 6m Purlins Truss
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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