| 摘要 |
The present invention is directed to a floor joist for use in a steel framed flooring structure. The floor joist has a U-shaped rectangular cross section with two parallel spaced apart flanges and a central web bridging the flanges and connected to one edge of each of the flanges. The central web has an extension on each end thereof, the extension extending beyond the flanges a distance of at least half the width of the flange.
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