| 摘要 |
The invention is weight bearing elements and methods relating to same. The elements having a web (200), and a chord (100) connected to the web (200), the chord (100) perimeter having a cross-sectional shape of a closed multi-sided figure having at least 5 sides (110, 120A, 120B, 130A, 130B), at least two of which are substantially parallel to the web (200). The chords may have a pentagonal cross sectional shape, some may have load transferring members (400), end-caps (500), stiffened rim bands (800) having die cut tabs (831, 832) and stiffening ribs (840). Other elements comprise one or more pairs of die cut tabs (831, 832) positioned directly opposite each other such that one tab (831) is adjacent the top of the rim band (800) while the corresponding tab (832) is adjacent the bottom of the rim band (800). Some elements may comprise a diamond shape stiffener (840) extruding from the back of the rim band, formed by punching a slot into the back of the rim band (800). The weight bearing elements may be "roll-formed" from a continuous sheet of material. |
