centers. The roof is assumed to support a dead load of 1,000 N/m2
of roof surface including self-weight and a live load of 823 N/m2
of horizontal roof surface projection. The slope of the roof truss
is 1 vertical to 2 horizontal and the purlins are spaced 0.8 m on
centers. Use A36 with Fy = 248 MPa. Assume all loads pass through
the center of gravity of the section. Sag rods are to be placed at
the middle thirds between trusses. Determine the ratio of the
actual to the allowable bending stress. Properties of W
Section A = 3,071 mm2 d = 172.4 mm bf = 103.6 mm tf = 10.01 mm Sx =
169,275 mm3 Sy = 43,593 mm3 tw = 6.4 mm Use the following allowable
stresses (NSCP 2001): For bending about strong axis, Fbx=0.66 Fy
For bending about weak axis, Fby=0.75Fy
- A W Section Steel Purlin Span 5 5 M Between Roof Trusses On Centers The Roof Is Assumed To Support A Dead Load Of 1 000 1 (21.59 KiB) Viewed 18 times