The roof system of an office building consists of a 4-in.- thick reinforced concrete sla...

The roof system of an office building consists of a 4-in.- thick reinforced concrete slab resting on four steel beams (A = 16:2 in.²), which are supported by two steel girders (A =42:9 in.²). The girders, in turn, are supported by four columns, as shown in Fig. P2.8. Determine the dead loads acting on the girder AG.