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Re: FRP (plastic bridge)

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>From a 
>design point I seem to remember that he FRP has a much lower modulus of 
>elasticity so deflection could be an issue.  Could cause a bouncy effect 
>for long span bridges (??).
It affects stability, too--outstanding flanges and column behavior. I 
think the biggest issue is connections. I've done some work on other FRP 
types of structure, and fastening stuff together requires some thought. 
You can't preload heavy bolts into FRP because the bolt tension crushes 
the resin. The preload goes away and you're looking at loose bolts and 
fatigue problems. Welding is clearly out, so your assembly experience may 
not be applicable

Christopher Wright P.E.    |"They couldn't hit an elephant at
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)

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