Practice-oriented structural design of timber-concrete composite slab elements
1University of Applied Sciences of Western Switzerland (Switzerland), 2Imperial College (UK)
Timber-concrete composite (TCC) structural elements for floor slabs see more and more application in practice, due to their excellent structural performance in relation to their self-weight, their advantages (in comparison to pure timber structures) with regard to vibrational behavior, deflections and acoustic insulation properties, and so forth.
For the structural design of TCC flexural elements, different particular issues have to be considered, such as flexibility and non-linear force-slip behavior of the interface connections, long-term and time-variant deformations (creep, shrinkage, and hygroscopic behavior), inelastic compressive behavior of timber and concrete, cracking etc.
These issues should be appropriately considered in the structural modeling and verifications of TCC flexural elements, at serviceability level (particularly, on the long term) as well as ultimate limit state. The literature provides analytical methods (e.g. g-method of EC5) which are relatively easy to use but only precise for cases of little practical relevance. Otherwise, numerical methods (e.g. finite differences) are available which allow the precise evaluation of the structural behavior but are rather heavy in their application. Both methods are unsatisfactory for the efficient use in daily structural engineering practice.
The proposed session wants to collect practical experiences and latest research results for the use of frame- or truss-analogy models for the structural design of flexural TCC elements, preferably in comparison to experimental results, targeting the impacts on the overall structural behavior of the following aspects:
- Interface connector behavior;
- Constitutive laws for timber and concrete;
- Short-term and long-term structural behavior;
- Structural safety concepts and specific structural verifications.
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