Use LRFD and design the tension members of the roof truss shown. Use double-angle shapes throughout and assume 3/8-inch thick gusset plates and welded connections. Hint: Design the bottom chord all as one member and any web members in tension as one member. Assume a shear lag factor of U = 0.80. The trusses are spaced at 30 feet. Use A36 steel and design for the following loads. Metal deck: 4 psf of roof surface Built-up roof: 12 psf of roof surface Purlins: 3 psf of roof surface (estimated) Snow: 20 psf of horizontal projection Truss weight: 5 psf of horizontal projection (estimated)
Use LRFD and design the tension members of the roof truss shown. Use double-angle shapes throughout and assume 3/8-inch thick gusset plates and welded connections. Hint: Design the bottom chord all as one member and any web members in tension as one member. Assume a shear lag factor of U = 0.80. The trusses are spaced at 30 feet. Use A36 steel and design for the following loads. Metal deck: 4 psf of roof surface Built-up roof: 12 psf of roof surface Purlins: 3 psf of roof surface (estimated) Snow: 20 psf of horizontal projection Truss weight: 5 psf of horizontal projection (estimated)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Use LRFD and design the tension members of the roof truss shown. Use double-angle shapes
throughout and assume 3/8-inch thick gusset plates and welded connections. Hint: Design the
bottom chord all as one member and any web members in tension as one member. Assume a shear
lag factor of U = 0.80. The trusses are spaced at 30 feet. Use A36 steel and design for the following
loads.
Metal deck: 4 psf of roof surface
Built-up roof: 12 psf of roof surface
Purlins: 3 psf of roof surface (estimated)
Snow: 20 psf of horizontal projection
Truss weight: 5 psf of horizontal projection (estimated)
Use grade 50 for the weld.
Transcribed Image Text:8'
8 @ 10' = 80'
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