The structural system for the metal building shown below consists of gabled frames spaced at 25'-0" on center. Each gabled frame is assembled from a roof truss supported by a column at each end. The knee braces provide lateral support for the frame but do not resist any vertical loads. The roof of the building is subjected to a dead load of D = 20 psf and a snow load of S= 90 psf. In addition, the space between the trusses is used for storage, so a live load of L = 20 psf is applied to the ceiling that is supported by the bottom chord of the truss. First, calculate all the truss joint loads for one interior roof truss and summarize them in a loading diagram. Be sure to show the dead, live, and snow loads separately in your loading diagram. Second, draw free-body diagrams of the truss corresponding to the LRFD load combinations. Finally, determine the factored load, Pu, each column is required to carry for each load combination and identify the load for which the columns should be designed. Ridge strut Purlins 12 ft Eave strut Side paneling Knee bracing 20 ft Girts Floor From m 8 at 7 ft 6 in 60 ft Figure 2. Transverse section of metal building. 425 to Figure 3. Isometric view of metal building. The structural system for the metal building shown below consists of gabled frames spaced at 25'-0" on center. Each gabled frame is assembled from a roof truss supported by a column at each end. The knee braces provide lateral support for the frame but do not resist any vertical loads. The roof of the building is subjected to a dead load of D = 20 psf and a snow load of S= 90 psf. In addition, the space between the trusses is used for storage, so a live load of L = 20 psf is applied to the ceiling that is supported by the bottom chord of the truss. First, calculate all the truss joint loads for one interior roof truss and summarize them in a loading diagram. Be sure to show the dead, live, and snow loads separately in your loading diagram. Second, draw free-body diagrams of the truss corresponding to the LRFD load combinations. Finally, determine the factored load, Pu, each column is required to carry for each load combination and identify the load for which the columns should be designed. Ridge strut Purlins 12 ft Eave strut Side paneling Knee bracing 20 ft Girts Floor From m 8 at 7 ft 6 in 60 ft Figure 2. Transverse section of metal building. 425 to Figure 3. Isometric view of metal building