Stiffness Reduction
In the Stiffness Reduction tab of the Thickness dialog box, you can set the failure modes (CM) 1 to 3 using the 'Options for Cross-Laminated Timber'. They affect the shear design.
The design checks themselves are described in the Timber Design add-on.
The theoretical background of the failure mechanisms is explained in Chapter Stresses.
Wenn das Kontrollfeld 'Bemessung bei Versagen des Nettoquerschnitts und Versagen der geklebten Kontaktfläche' nicht angehakt ist, wird lediglich der Nachweis auf den Versagensmechanismus 1 durchgeführt: Failure modes 2 and 3 cannot occur for boards bonded with narrow sides.
The 'board width including gap' option allows you to increase the effective plank width.
Stiffness matrix
You can select and define the materials and material models described in the RFEM manual for any layers. Based on these stiffnesses, a stiffness matrix is generated, which is used by RFEM to determine the deformations, stresses, and internal forces.
The stiffness matrix of the entire structure is displayed in the Stiffness Matrix tab of the Thickness dialog box.
Currently, the 'Direct' thickness type is available for defining layers (see the image Defining Layers ). As soon as contact types between the individual layers are possible, it will also be possible to define contact conditions via surface contact types.