Concrete fillable steel joist

A concrete fillable steel joist comprising:

• a generally U-shaped member having spaced apart webs and a bottom chord;
• a top chord operably attached to the U-shaped member, the top chord having a plurality of spaced apart top chord holes and having two elongate channels formed therein for receiving the spaced apart webs of the U-shaped member;
• a pair of end plates operably attached at opposed ends of the U-shaped member;
• and
• whereby the U-shaped member, the top chord, and the pair of end plates define a volume that is fillable with concrete.

A concrete fillable steel joist system comprising:

• a plurality of spaced apart concrete fillable steel joists wherein each concrete fillable steel joist includes:
• a generally U-shaped member having spaced apart webs and a bottom chord;
• a top chord operably attached to the U-shaped member, the top chord having a plurality of spaced apart top chord holes and having two elongate channels formed therein for receiving the spaced apart webs of the U-shaped member;
• and
• whereby the U-shaped member and the top chord define a volume that is fillable with concrete when opposed ends of the U-shaped member have joist ends operably attached thereto;
• metal decking operably attached between the spaced apart concrete fillable steel joists;
• and
• whereby the concrete fillable steel joist and the metal decking are configured to receive concrete.