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Re: FEM modeling of roof diaphragms

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>You can use a plate element with an orthotropic material to represent 
>different rigidities in X and Y directions.
True as far as it goes. It gets a little tricky, since you need to model 
different rigidities in both directions for axial, bending and shear 
loading. It helps if your FEA software can do layered composites. You may 
also have some trouble figuring stresses, since the thicknesses involved 
may not me the material thickness as modelled. I think the ASCE applied 
mechanics division has some papers on this topic.

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