| 摘要 |
A unitary steel joist includes a generally vertical web, a generally horizontal bottom flange, a generally horizontal top flange, a bottom wing, a bottom web portion, a top wing and a top web portion. The generally horizontal bottom flange extends outwardly on each side of the web. The bottom flange is made of two pieces of steel. The generally horizontal top flange extends outwardly on each side of the web. The top flange is made of two pieces of steel. The bottom wing extends outwardly from the web. The bottom web portion extends between the bottom flange and bottom wing. The top wing extends outwardly from the web. The top web portion extends between the top flange and the top wing. The unitary steel joist is made from a unitary piece of steel. |
