This chapter describes special features that should be considered during the calculation.
In the case of softer cross-laminated timber panels with thicker board layers in particular, it is important to ensure that the individual layers are not too thick: The high shear distortion of the boards that are shifted in layer by 0° and 90° with a modulus of elasticity of E90 = 0 for the secondary direction cannot be represented correctly by the plate theory in the case of thicker layers. In this case, the calculation is performed with values that are too stiff!
An extreme example of this is the example of a so-called sandwich plate shown in the following image. The top layers consist of thin steel plate and the very thick middle layer of foam plastic.
You can understand the problem in the "shear strain" model (see the column on the right). The error is clearly visible in the cross-laminated timber plate with very thick intermediate layers. For common cross-laminated timber structures - also shown in the model - the error approaches zero.
