I am being asked to bid on doing the connection design for a small steel-framed addition to an existing building. In reviewing the drawings, the engineer of record has concrete slab on composite metal deck, with composite steel beams and the associated shear studs called out on the framing plans. I question this design, as the beams which are part of the moment frame MUST see some negative moment along their span, and I was under the impression that composite members could only be used in situations with positive moment only. Am I right to question his design?