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Originally Posted by Mat-C  Ahh.. ok... so if you have two flat-bar stiffeners, both supporting the same panel, both with the same thickness, is the taller one any more prone to web sheer? |
Depends how you arrange the structure. But each stiffener is judged on its own dimensional aspects.
Thus in your example, each will have a shear area. The hydrostatic pressure, on the WTB, is the same. Thus the force being applied to each stiffener is the same. Hence the shorter stiffener has a higher shear stress than the deeper one. But if it passes, so what?
The key thing to consider with all aluminium design is deflection checks. Generally once you have designed the structure to satisfy your design stress allowable, you need to check deflections. Deflections are often too high and therefore you need to make the sections stiffer.
08-12-2010, 12:05 AM
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