Cromwell provided the design for a moment-frame stucture for the Nucor Yamato Steel campus. A moment frame structure is a rectilinear assemblage of beams and columns, with the beams rigidly connected to the columns. Nucor Yamato Steel will use this strucuture to modify Cromwell provided the design for a moment frame stucture. A moment frame strucuture is a rectilinear assemblage of beams and columns, with the beams rigidly connected to the columns. Nucor Yamato Steel will use this strucuture to modify an existing diagonal brace in order to install some equipment.