How can I calculate a timber-concrete composite floor with cross-laminated timber?


Two planar structural components can be defined in the RF‑LAMINATE add-on module by using the hybrid material model (Figure 01).

In this case, it would be possible to automatically enter a cross-laminated timber plate according to the manufacturer's specifications (see Figure 02).

However, the disadvantage of the input in the RF‑LAMINATE add-on module is in the requirement for a rigid connection. This is not the case of the timber-concrete composite structure. Thus, the calculation is only an approximation.

Another option is to couple two surfaces using a surface release or a contact solid. The advantage is that you can define almost any shear transfer in this way (Figure 03). In the RFEM model file attached, this has been defined in the middle second model.

The third option would be to define a hybrid member as specified in the third model of the attached file. In this case, however, the biaxial load transfer of the structure will not be considered. Though, this method has the advantage of highly automated design. It is also explained in this FAQ.


Biaxial Hybrid Timber-concrete composite beam


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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

Price of First License
3,540.00 USD
RFEM Other

Add-on Module

Deflection analysis and stress design of laminate and sandwich surfaces

Price of First License
1,120.00 USD