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This method made it necessary to place vertical steel pins through the top and bottom slabs of the deck box girder .
The column-free space is spanned by main trusses that rest on box girders .
The steel strut is a fabricated plate box girder weighing 800 lb/ft.
The arch's 4-ft-wide box girder is 6 ft deep at mid-span and 20 ft deep at the ends.
To span this space Peters designed the frame's most innovative element: a 143-foot-long giant steel box girder as the primary support for the first balcony.
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