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PDE11_Simple_Plane_Truss

PDE11_Simple_Plane_Truss - CEE111 Practice Design Exercise...

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CEE111 Practice Design Exercise 11 Design of Plane Truss The simple plane truss shown in Figure 1 is to be designed to carry a load of 2,000 pounds applied at joint 2. The members of the truss are to be comprised of bars of circular cross section, pinned (i.e., supported no moment) at the three points shown in the figure. Figure 1. Simple Truss Configuration Although the design is required to use a single structural material in the final design, three different materials are to be considered for the bars: 1) Aluminum, 2) Stainless steel, and 3) Carbon Steel. The associated engineering, material, and cost properties of these materials are shown in Table 1. Table 1. Material Properties 15 ft 20 ft 2000 lb 1 3 2 Material Yieldf y (psi) E (lb in 2 ) Cost ($/lb) Density (lb/in 3 ) Aluminum 35,000 10.2 x 10 6 $1.05 0.100 StainlessSteel 40,000 27.6 x 10 6 $1.85 0.292 CarbonSteel 30,000 29.0 x 10 6 $0.40 0.284
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The budget available for the cost of materials in the construction of the truss is $1,000; i.e., the cost of materials cannot exceed $1,000. In addition to this budget condition, other engineering
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