Question

Fig. P2(a) shows a perspective view of a billboard supported by three equally-spaced trusses. Te truss spacing is shown as d in the figure. The billboard is subjected to a uniform wind pressure of 100 lb/ft Each truss is made of hollow circular steel tubes with an inner radius of 2 inches and an outer radius of 4 inches. Use the tributary arca meth compute the (wind) loads acting on the center truss. The model of the center truss is shown in Fig. P2(b) Carry out the analysis using the following values: d=30 feet, a=60 ft and b-20 ft. Perform all your calculations using SI units: kilogram for mass, meters for length, and seconds for time. od to (a) Compute the total weight of the truss. Determine if the weight of the truss is important in the truss analysis. If it is, include the weight of the truss as additional loads. b) Compute all the support reactions (c Compute the member forces in members AB, AF BF, BC, CG and FG using Method of Joints. (d) Compute the member force in members CD, DG and GH using Method of Sections. Fig. P2(a) Fig. P2b)

Answer 1