Plywood Box Beam Strength. Design guide #7 provides a series of span tables designed according to the limit state design theory and for wind. 19 995 просмотров 19 тыс. The options provided in the following span tables are designed according to limit state design theory and for winds speeds up to n3.
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The resins used to adhere the plies are designed for extra strength to avoid separating the layers. Current box beam prediction equations were oversimplified and did not produce reasonable estimates for either web material. Nail withdrawl strength is superior in plywood.
An exception would be a plywood box beam built and used as prescribed in the building code.
All the parts are glued together. If you must use common nails, set them but a plywood laminated beam just isn't strong enough. It makes sense to stagger the joints so they don't align but the joints still seem like real weak points to me. That's why wooden joists and steel beams stand on edge. In addition to the plywood grades, there are four common plywood bonding types. The panel should be installed with its strength axis in the same direction as the flanges. Plywood box beams are lightweight, simple to fabricate, conventionally stable and, with good design, structurally effi cient and economical. Glue, staples and a little engineering turn sheets of plywood into trusses and columns.
