For Problem 1: Use LRFD and design the tension members of the roof truss shown in Figure below. Use double-angle shapes throughout and assume 20-mm-thick gusset plates and welded connections. Assume a shear lag factor of U=0.8 . The trusses are spaced at 9 meters. Use A36 steel and design for the following loads. Metal deck : 380 Pa of roof surface Built-up roof : 1150 Pa of roof surface Purlins : 290 Pa of roof surface (estimated) Roof Live Load : 1920 Pa of horizontal projection Truss weight : 480 Pa of horizontal projection (estimated) For Problem 2: Use A36 steel and design sag rods for the truss of problem 1. Assume that, once attached, the metal deck will provide lateral support for the purlins; therefore, the sag rods need to be designed for the purlin weight only. a. Use LRFD. b. Use ASD.
For Problem 1: Use LRFD and design the tension members of the roof truss shown in Figure below. Use double-angle shapes throughout and assume 20-mm-thick gusset plates and welded connections. Assume a shear lag factor of U=0.8 . The trusses are spaced at 9 meters. Use A36 steel and design for the following loads. Metal deck : 380 Pa of roof surface Built-up roof : 1150 Pa of roof surface Purlins : 290 Pa of roof surface (estimated) Roof Live Load : 1920 Pa of horizontal projection Truss weight : 480 Pa of horizontal projection (estimated) For Problem 2: Use A36 steel and design sag rods for the truss of problem 1. Assume that, once attached, the metal deck will provide lateral support for the purlins; therefore, the sag rods need to be designed for the purlin weight only. a. Use LRFD. b. Use ASD.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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For Problem 1: Use LRFD and design the tension members of the roof truss shown in Figure below. Use double-angle shapes throughout and assume 20-mm-thick gusset plates and welded connections. Assume a shear lag factor of U=0.8 . The trusses are spaced at 9 meters. Use A36 steel and design for the following loads.
Metal deck : 380 Pa of roof surface
Built-up roof : 1150 Pa of roof surface
Purlins : 290 Pa of roof surface (estimated)
Roof Live Load : 1920 Pa of horizontal projection
Truss weight : 480 Pa of horizontal projection (estimated)
For Problem 2: Use A36 steel and design sag rods for the truss of problem 1. Assume that, once attached, the metal deck will provide lateral support for the purlins; therefore, the sag rods need to be designed for the purlin weight only.
a. Use LRFD.
b. Use ASD.
Transcribed Image Text:2.4 m
8 @ 3 m = 24 m
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