Stiffness Reduction
In the Stiffness Reduction tab of the Thickness dialog box, you can influence failure modes (CM) 1 to 3 via the 'Options for CLT'. These affect the shear design.
The design checks themselves are described in the Timber Design add-on.
The theoretical background to the failure modes is explained in the chapter Stresses.
If the 'Design for failure of net section and failure in glued contact surface' check box is not selected, only the design for failure mode 1 is performed: Failure modes 2 and 3 cannot occur for planks with glue on the narrow sides.
The 'Plank 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 layer. 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.
The thickness type 'Direct' is currently available for defining the layers (see image Defining Layers ). Once contact types between the individual layers are possible, it will also be possible to define contact conditions via surface contact types.