orthotropic plate deflection

[gd87]

Hello,
I am a new sap2000 user, and I am studying orthotropic plates in timber.
I have the results of a lab test and I need to do a simulation,
It is a rectangular plate (5m x 8m x 0,27 m) supported at two edges and loaded with a distributed load at the center.
after, drowing the plate, assigning the orthotropic parameters, assgning area section, the boundary conditions and the load as a surface pressure I run the simulation but I get much higher values in the deflection.
Do you know what I am doing wrong? I am sure it's a very simple question for you more expert than me.
Thank you
Giuseppe

 

[stressed]

You don't give enough information in order for anyone to help you. Orthotropic parameters are handled by defining an orthotropic material. Maybe you could post your .sdb file or give more information