Design the lightest W-shape beams to support a 150-mm-thick reinforced concrete slab as shown. The beams are simply supported, are 2.20 m on center, and span 12 m.
The service live load on the slab is 6.0 kPa. (Assume the unit weight of reinforced concrete to be 23.5 kN/m3.)
![254_Figure 01.jpg](https://secure.tutorsglobe.com/CMSImages/254_Figure 01.jpg)