"A girder (/ˈɡɜːrdər/) is a support beam used in construction. It is the main horizontal support of a structure which supports smaller beams. Girders often have ...
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an I-beam cross section composed of two load-bearing flanges separated by a stabilizing web, but may also have a box shape, Z shape, or other forms. Girders are commonly used to build bridges.
A girt is a vertically aligned girder placed to resist shear loads.
Small steel girders are rolled into shape. Larger girders (1 m/3 feet deep or more) are made as plate girders, welded or bolted together from separate pieces of steel plate." - (en.wikipedia.org 06.05.2022)