Nachrichten - Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau

Analysis of crack behaviour

Wed, 02 Jul 2025 09:19:13 +0200

The structural behavior of GFRP reinforcement in concrete differs from steel, primarily due to its linear-elastic response until failure, unlike steel’s yielding. These differences also affect failure mechanisms and crack patterns. To study the interaction between FRP and concrete, computed tomography (CT), a non-destructive testing method, was used. CT enables detailed internal imaging, revealing crack development and internal damage. This paper presents results from in-situ CT bending tests on small GFRP-reinforced concrete beams, using a custom setup for CT under load. Crack propagation across load stages is analyzed, supported by comparisons with analytical models. Future test concepts for CT are also proposed.

Gulliver – A new kind of industrial CT

Thu, 06 Mar 2025 08:42:32 +0100

Wir freuen uns, unsere neue Veröffentlichung über die Tomografie Portal Gulliver am ��ֱ�� in Kaiserslautern vorstellen zu können. In dieser Veröffentlichung stellen wir einige der Messergebnisse vor, die während der derzeitigen Fertigstellung der Anlage erzielt wurden. Die CT-Messungen sollen neue Erkenntnisse über Betonstrukturen mit einer Länge von bis zu 6 m und einem rechteckigen Querschnitt mit einer Breite und Höhe von 0,3 m unter Last liefern. Darüber hinaus werden die geplanten zukünftigen Messkampagnen mit dem System vorgestellt und erläutert, wie Sie das innovative Prüfsystem für Ihre eigenen Forschungsaktivitäten nutzen können.

Numerical model validation with computed tomography

Tue, 17 Sep 2024 14:17:29 +0200

In order to make accurate predictions of the structural behaviour of non-metallic reinforced concrete elements, one of the key problems in the development of this type of new material system is the capacity of modelling the load transfer mechanisms between the concrete matrix and the reinforcement elements. To predict the load-deflection response up to ultimate limit state conditions, a wide range of numerical simulation approaches, with capability of modelling the bond behaviour between the different materials has been proposed over the years and compared to experimental results. This research work presents new possibilities for comparing numerical finite elements models with laboratory data generated by computed tomography, namely in the context of three-point bending tests performed on carbon-reinforced concrete specimens. The aim is to present the potential of in situ computed tomography for validation of numerical simulations. Examples of computed tomography generated quantitative results and data visualisation are shown, which focus on generated displacement fields and crack patterns.