| 摘要 |
The present invention relates to a cold rolled steel beam comprising: a web having two layers of steel, the web having a top end and a bottom end; a pair of bottom flanges extending outwardly from the bottom end of the web; and a pair of top flanges extending outwardly from the top end of the web, each top flange having two layers of steel. Preferably, a portion of each bottom flange has two layers of steel, and the cold rolled steel beam includes a pair of end connectors extending generally orthogonally from the web and positioned generally orthogonally to the bottom flanges and the top flanges. Preferably, the cold rolled steel beam is cold formed from a unitary piece of sheet steel. |
