Concrete-concrete composite


I’m wondering if there is any differences between modelling a concrete concrete composite section with a solid composite section or a thin walled composite section. The idea is that the new layer of concrete is poured above the old one and to see how the stresses behave. Of course in modelling to use different materials in different construction stages but how to make sure that creep and shrinkage are also taken in to account and the interface between two layers is working as it should?

Does anyone have experience of this kind of problem?


The differences between a solid and a thin walled composite section can be found within the AQUA manual.

SSD / TEDDY > Help > User Manuals > All Manuals… > AQUA

If you just need a summary of the differences, check out the composite bridge tutorial. > Infocenter - Overview > Documentation - Tutorials > bridge tutorials > Composite Bridge > Cross Sections
For concrete composite sections I would choose a solid cross section.

Although you are working with SOFiPLUS(-X), you should look at the results of the following TEDDY tutorial. It describes the calculation of a composite beam very well.

TEDDY > File > Examples > csm > english > csm3_composite_beam.dat

Creep and shrinkage are calculated for the different construction stages of the cross section with the task “Construction Stages”.

Best regards
Frederik Höller
Your SOFiSTiK Support Team