The floor plan of an industrial building is shown below.  Th…

The floor plan of an industrial building is shown below.  The roof is flat and the joists span in the north-south direction.  Three joists support a 4800-lb roof top unit (RTU).  The loading consists of roof live load (20 psf), dead load (including joist self-weight) = 10 psf, and the weight of RTU.  All the given loads are unfactored.      The maximum shear for joist design is nearly