Why is the shear stiffness reduced to 10% in the RF-LAMINATE add-on module as well as for the material module orthotropic in RFEM for the shear modulus Gyz? In my opinion, the shear stiffness in slice plane Gxy would have to be reduced here?


The reduction of the shear stiffness results from the fact that the fibers have a very small stiffness and a low strength perpendicular to each other. For this reason, the rolling shear strength of CLT panels is also very small.

For cross-laminated timber panels, glued sidewalls on boards are assumed. The boards are applied in the longitudinal direction along the x-axis of the coordinate system (Figure 2). For the shear stresses in Figure 2, the shear stress τyz is thus juxtaposed to the rolling shear strength.

The same applies to the shear stiffnesses. In the direction of the minor axis (yz plane), the stiffness of the individual boards is considerably smaller than in the direction of the principal axis (xz plane) and also larger than in the xy plane. The coordinate system shown in Figure 2 should be placed on the board in Figure 3.


Wide stock Sideboards Stiffness Rolling shear


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RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

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RFEM Other

Add-on Module

Deflection analysis and stress design of laminate and sandwich surfaces

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