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. Truss Properties of C 200 x 76 mm 1.2 Sx = 6.19 x 104 mm Sy = 1.38 x 104 mm W = 79 N/m 12 1.2 1.2 TIK Allowable bending stress Fbx = Fby = 207 MPa Truss 6m O Calculate the bending stress, fox, for dead load and live load combination (D + L). O 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 fbx = 151.14 MPa fby = 169.6 MPa Interaction = 1.25 windward side.
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. Truss Properties of C 200 x 76 mm 1.2 Sx = 6.19 x 104 mm Sy = 1.38 x 104 mm W = 79 N/m 12 1.2 1.2 TIK Allowable bending stress Fbx = Fby = 207 MPa Truss 6m O Calculate the bending stress, fox, for dead load and live load combination (D + L). O 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 fbx = 151.14 MPa fby = 169.6 MPa Interaction = 1.25 windward side.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text: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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