| 摘要 |
A structural beam has a thin metal web with a plurality of holes located along its top and bottom edges. One or more rectangular flange pieces are located on each side of the web overlying its top margin and one or more rectangular flange pieces are located on each side of the web overlying its bottom margin. The flange pieces contain holes which are aligned with the holes in the web piece and fasteners extend through the aligned holes to fasten the flange pieces to the web.
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