box stringer

close string, close stringer, closed stringer, curb string, housed string

A staircase string whose upper edge is straight and parallel to its lower edge; the tread and riser ends are housed in the face of the string and are concealed.
References in periodicals archive ?
Construction of a new two lane, single span, 18 metre long bridge with 700 mm deep prestressed concrete box stringers, steel H-pile foundation, cast-in-place concrete abutments, deck and parapets; construction of approximately 125 metres of asphalt paved approaches; removal and disposal of the existing 3.