| 摘要 |
The I-beam or joist is reinforced with corrugation on its web to form triangular pattern of trust structure. It can also reduce weight by punching holes in between corrugations. This not only reduce weight, but also provide space for utilities lines, which offer more overhead room, better architectural design, and lower construction cost. The reinforced metal web is further employed in metal-wood hybrid joist with wood flanges, which is light in weight, provides space for utility lines, and also other materials like panels can be nailed to the flanges.
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