Define the term fully stressed beam?

1) A long span open-web steel joist with a span of 70 feet is required to support a floor. The joists are spaced at 3.5 ft apart, the dead load is 15 lb/ft² (not including the self weight), the live load is 80 lb/ft? and the live load deflection is limited to L/360 (which is that used to determine the live load limit - in red/light - based on deflection in the SJI catalogue tables and those limits must be multiplied by 1.5 if L/240 is used). Using the LRFD table provided, select the most economical joist that can be used considering the self weight. The lighter values are the limiting unfactored live load. (Note: longer spans that can support the load can also be used.)

10.8 (B). A compound cylinder is formed by shrinking a tube of 200 mm outside and 150 mm inside diameter on to one of 150 mm outside and 100 mm inside diameter. Owing to shrinkage the radial stress at the common surface is 20 MN/m². If this cylinder is now subjected to an internal pressure of 100 MN/m² (1000 bar), what is the magnitude and position of the maximum hoop stress? [164 MN/m³ at inside of outer cylinder]

What are the W shapes that would be used for unbraced lengths? A W shape is to be used for a uniformly loaded simple beamcarrying a total dead load of 26 kips and a total live load of 26 kips on a36-ft span. Select the lightest weight shape for unbraced lengths of (1) 9 ft, (2) 12 ft, and (3) 18 ft. A W shape is to be used for a uniformly loaded simple beamcarrying a total dead load of 30 kips and a total live load of 40 kips on a 24-ft span. Select the lightest weight shape for unbraced lengths of (1) 6 ft, (2) 8 ft, and (3) 12 ft.