The Pratt roof trusses are uniformly spaced every 15 ft. Thedeck, roofing material, and purlins have an average weight of 5.6psf. The building is located in New York where the anticipated snowload is 20 psf and the anticipated ice load is 8 psf. Theseloadings occur over the horizontal projected area of the roof.Determine the vertical deflection (in units of inches) of joint Cdue to the dead load, snow, and ice loads. Neglect the weight ofthe truss members and assume A is pinned and E is a roller. Eachmember is made of steel (E = 29,000 ksi) with a cross-sectionalarea of 1 in2.
