The paper presents the study of spalling effect occurring under tensile loading in thin-walled TRC specimens. The experimentally observed failure patterns are first classified and the performed experiment design is explained and discussed. A parameter study of spalling effect with varied thickness of concrete cover and reinforcement configurations including both the textile fabrics and the yarns provided the basis for numerical analysis of the effect. The applied numerical model was designed in order to capture the initiation and propagation of longitudinal cracks leading to the separation of concrete blocks from the textile fabrics. A meso-scopic material resolution in a single crack bridge is used for the simulation exploiting the periodic structure of the crack bridges both in the lateral and in the longitudinal direction of the TRC specimens. The matrix was modeled using an anisotropic damage model falling in the microplane-category of material models. The bond between yarn and matrix follows a non-linear bond-law calibrated using pull-out tests. The epoxy-impregnated reinforcement is considered as a homogeneous bar.

The paper presents the study of spalling effect occurring under tensile loading in thin-walled TRC specimens. The experimentally observed failure patterns are first classified and the performed experiment design is explained and discussed. A parameter study of spalling effect with varied thickness of concrete cover and reinforcement configurations including both the textile fabrics and the yarns provided the basis for numerical analysis of the effect. The applied numerical model was designed in order to capture the initiation and propagation of longitudinal cracks leading to the separation of concrete blocks from the textile fabrics. A meso-scopic material resolution in a single crack bridge is used for the simulation exploiting the periodic structure of the crack bridges both in the lateral and in the longitudinal direction of the TRC specimens. The matrix was modeled using an anisotropic damage model falling in the microplane-category of material models. The bond between yarn and matrix follows a non-linear bond-law calibrated using pull-out tests. The epoxy-impregnated reinforcement is considered as a homogeneous bar.

Mit der neuartigen Bauweise der additiven Fertigung wurden verschiedene Strukturen aus Carbonbeton hergestellt. Die in diesem Beitrag thematisierte Besonderheit ist die Verwendung von Carbonbewehrung mit mineralischer Tränkung, die es ermöglicht, den Verbund zur Betonmatrix zu verbessern und das volle Potential der digitalen Fertigung im Hinblick auf die geometrische Freiheit auszuschöpfen. Nach der Vorstellung des verwendeten 3D-Druckverfahrens und der Tränkung der Bewehrung wird auf die unterschiedlichen Möglichkeiten der Bewehrungsintegration eingegangen. Im Anschluss werden die Ergebnisse der mechanischen Untersuchungen an den mittels der bevorzugten Herstellungsweise gefertigten Prüfkörpern unter Einbeziehen von CT-Aufnahmen diskutiert. Die entwickelte Technologie hat das Potential, den Bauprozess effizienter und umweltfreundlicher zu gestalten.