Let me restate the question

[Ric Brekne]

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Thankyou muchly Ron. 

If I may take this unribbed (at this point) laminated and curved board a 
step further then.  What if you add to the mix :

    1: align the grain of the panel perpendicular to the bridge.
    2: rib cross grain to equalize stiffness.

Do you think it would be strong enough with  a standard thickness to do 
the job then ? Would you expect to be able to use less ribbing then 
usually ?

Cheers
RicB

Ron Overs writes:

If you are thinking about the application of a laminated panel
without ribs, this wouldn't have sufficient stiffness to support the
downbearing load if the panel thickness was a standard nominal
thickness (say between 7-9 mm). A panel on its own would have
insufficient sectional depth to achieve the stiffness required.

If you were to use a thicker panel, at some point you would achieve a
satisfactory stiffness but the overall mass of such an assembly would
greatly exceed the mass of a conventionally ribbed panel of normal
thickness.

One of the principal structural benefits of the ribs is that it gives
the overall assembly a sufficient sectional depth that the panel and
ribs can, together as a unit, provide the necessary stiffness.

I'm not suggesting that a laminated panel wouldn't have a higher
stiffness than an equivalent thickness solid panel. It certainly
would, but not enough to support downbearing in its own right. If you
find this hard to believe just laminate a little section for you own
investigation.

Best,
Ron O.

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