How to calculate a timber-concrete composite floor with CLT?


Two planar structural components can be defined in the RF-LAMINATE add-on module via the Hybrid material model (Figure 1).

In this case, the automatic input of a cross-laminated timber plate would according to the manufacturer's specifications also be possible (see Figure 2).

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

Another possibility is to couple two surfaces via a surface release or a contact solid. The advantage is that you can define almost any shear transfer this way (Figure 3). In the RFEM model file attached here, 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. However, this method has the advantage of highly automated design. This is also explained in this FAQ .


Biaxial Hybrid Timber-concrete composite beam


Contact us

Contact to Dlubal

Did you find your question?
If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.

+49 9673 9203 0

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