Reinforced steel beam and hybrid joist

Abstract

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.

What is claimed is:  
     
         1 . A structural member of beam, comprising; 
 a pair of spaced flanges facing each other, connected with intervening web having substantially uniform thickness;    repeating patterns of corrugation on the web intermediate the flanges in combination of angles which form triangular pattern of trust structure.    
     
     
         2 . A member in accordance with  claim 1 , in which the corrugations are in alternating oblique angles in opposite direction, which form ‘W’ shaped trust pattern.  
     
     
         3 . A member in accordance with  claim 1 , in which the corrugations are in repeating combination of right angle and oblique angles to longitudinal direction, which form ‘N’ shaped trust pattern.  
     
     
         4 . A member in accordance with  claim 1 , in which the web having punched holes in between the corrugations.  
     
     
         5 . A member in accordance with  claim 1 , in which the flanges are made of wood.  
     
     
         6 . A member in accordance with  claim 5 , in which the wooden flanges each having groove extending longitudinally thereof in alignment of facing groove of the other flange, as receptacle to the web.  
     
     
         7 . A member in accordance with  claim 6 , in which the web has fishing-hook like spikes leaning to the direction toward the center of the web on its side edges, which fit into and lock in the groove of flange.  
     
     
         8 . A member in accordance with  claim 6 , in which the web is fit into groove of the flange and secured with glue.  
     
     
         9 . A member in accordance with  claim 6 , in which the flanges are made of veneer lumber.