Flange (of a girder)
The transverse plates of a girder, connected together by the web.
Note: The German term Gurt is used for timber beams of I-section, and in statics. The term Flansch is used for I-section steel beams.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM