The D1.8 is a Seismic supplement to D1.1.

Yes, they can unless the special conditions for added testing come into play where they would be welding the bottom beam flange to the vertical column flange of a moment connection through the weld access hole of the web in a connection deemed Demand Critical by the engineer and so noted on the prints for fabrication. 

He Is In Control, Have a Great Day,  Brent