[Zurück]

M. Lukacevic, J. Füssl, S. Pech, C. Vida, J. Eberhardsteiner:
"Computational Mechanics Concepts for Wood-Based Products and Timber Structural Elements";
Vortrag: World Conference on Timber Engineering (WCTE2021), Santiago, Chile; 09.08.2021 - 12.08.2021; in: "Proceedings of WCTE 2021 - World Conference on Timber Engineering", Santiago, Chile (2021).

The mechanical behavior of wood products highly depends on structural features on several length scales. This leads to a high amount of random fluctuation in mechanical properties at the structural level. In practice, homogeneous material behavior within timber elements is assumed and uncertainties in loading and load-bearing capacity are considered by using partial safety factors. Those are not directly linked to the mechanical behavior of the considered elements. Therefore, a stochastic framework opening up the possibility to establish such links by combining structural analysis and probabilistic descriptions of wood could be an important step in timber design.
For example, in GLT beams the mechanical behavior mostly depends on the tensile properties of individual boards. To describe their fluctuations, simulations on this level are performed. The reconstruction of knots and the implementation of new fracture mechanical methods allows the prediction of stiffness and strength properties for knot sections. Condensation of those results into stiffness and strength profiles permits the development of probabilistic models and the random generation of such profiles, and their use in wood product simulations. This can be used for sensitivity analyses of timber engineering designs or to obtain probabilistic descriptions of the uncertainties at the level of timber elements.

stiffness; strength; fracture mechanics; probabilistic description; sensitivity analysis

https://publik.tuwien.ac.at/files/publik_299400.pdf