Read in the attachment how the stiffnes matrix of a plate is built up and how you can do it yourself. This is often used for CLT (Cross Laminated Timber) plates.
Some time ago, we hosted a webinar about the stiffnessmatrix of CLT in Diamonds (in English and Dutch). We also hosted a webinar about CLT desing in FEM Design (only in English). You can review all webinars here.