Hochbelastbare CFK-Biege- und CFK-Querkraftträger: Nichtlineare Finite-Elemente-Analyse zu Traglast- und Stabilitätsuntersuchungen von Kastenträgern

Highly loaded CFRP-beams: Load bearing and stability analysis of box girders. Highly-loaded, thin-walled girders are in high demand in structural engineering.

Thin-walled structural elements are prone to exhibit warping of the cross section and buckling when subjected to high loads. Therefore, such phenomena need to be investigated. Additionally, with fiber-reinforced composites, intralaminar and interlaminar failure modes have to be considered. These characteristics along with the heterogeneous structure of fiber-reinforced composite plastics lead to complex modeling of the material and structural behavior. Special attention must be paid to the numerical implementation. In the joint project "Large high-strength fiber-reinforced polymer beams", funded by the German Research Foundation, finite element models for the analysis of load bearing characteristics of highly loaded fiber-reinforced composite beams were developed. In the process 4-node shell elements with five or six degrees of freedom at the nodes were used, in order to be able to model shell intersections. With the approach used three-dimensional problems can be modeled with two-dimensional shell models. To investigate the influence of delamination, so called interface-elements were used, which are based on a cohesive zone model. In this article the results of some finite element analyses conducted with the developed model are presented.