1. A plate girder must be designed to resist a service load bending moment of 2400 ft.k consisting of 25% dead load and 75% live load. The total depth of the girder will be 73 inches, and continuous lateral support will be provided. Use Fy = 50 ksi and select a trial cross section. Assume that the moment includes an accurate estimate of the girder weight.
2. A W10 section is to be selected to support the loads PD = 85 kips and PL = 140 kips. The member, which is to be 20 ft long, is fixed at the bottom and fixed against rotation but free to translate at the top. Use A992 steel.
3. Select a standard threaded round rod to support a factored tensile load of 72 kips (service tensile load = 50 kips) using A36 steel.