Problem #1 Light-grade steel channel was used as a purlin of a truss. The top chord of the truss is inclined IV:3 H and distance between trusses is equal to 3 m. The purlin has a weight of 71 N/m and spaced at 1.2 m. on centers. The dead load including the roof materials is 1200 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. Sag rods are placed at the middle thirds and Fbx = Fby = 138 MPa. Sx = 4.48 x 104 mm3 Sy = 1.18 x 104 mm3 %3D %D 1.2 1.2 Using interaction formula, determine the following: O Maximum ratio of actual to allowable bending stress for combination of (D + L) load. ® Maximum ratio of actual to allowable bending stress for combination of 0.75 (D + L + W). ® Maximum ratio of actual to allowable bending stress for combination of (D + L) if one line of sag rod was place at the mid-span.

Problem #1 Light-grade steel channel was used as a purlin of a truss. The top chord of the truss is inclined IV:3 H and distance between trusses is equal to 3 m. The purlin has a weight of 71 N/m and spaced at 1.2 m. on centers. The dead load including the roof materials is 1200 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. Sag rods are placed at the middle thirds and Fbx = Fby = 138 MPa. Sx = 4.48 x 104 mm3 Sy = 1.18 x 104 mm3 %3D %D 1.2 1.2 Using interaction formula, determine the following: O Maximum ratio of actual to allowable bending stress for combination of (D + L) load. ® Maximum ratio of actual to allowable bending stress for combination of 0.75 (D + L + W). ® Maximum ratio of actual to allowable bending stress for combination of (D + L) if one line of sag rod was place at the mid-span.

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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