Authors: Mellios, Nikolaos
Oesch, Tyler
Spyridis, Panagiotis
Title: Finite element modelling of UHPC under pulsating load using X-ray computed tomography based fiber distributions
Language (ISO): en
Abstract: The benefits of including fibers in ultra-high performance concrete (UHPC) are attributed to their good bond with the matrix and, hence, an optimal utilization of their properties. At the same time, though, fiber reinforcement may contribute to anisotropy in the composite material and induce weak areas. The influence of the fibers’ orientation on the material properties is a matter of current scientific discourse and it is known to play a vital role in structural design. In the case studies presented herein, mechanical laboratory tests using pulsating load regimes on UHPC with a strength of more than 200 MPa were simulated by use of finite element models. The orientations of the fibers were measured for each test sample prior to failure using an X-ray computed tomography (CT) scanner, and these orientations are explicitly implemented into the model. The paper discusses the methodology of merging data retrieved by CT image processing and state-of-the-art FE simulation techniques Moreover, the CT scanning was carried out throughout the testing procedure, which further enables the comparison of the mechanical tests and the FE models in terms of damage propagation and failure patterns. The results indicate that the overall fiber configuration and behavior of the samples can be realistically modelled and validated by the proposed CT-FE coupling, which can enhance the structural analysis and design process of elements produced with steel fiber reinforced and UHPC materials.
Subject Headings: Ultra-high performance concrete
Steel fiber reinforced concrete
Fiber orientation
X-ray computed tomography
Non-linear finite element modelling
Issue Date: 2021-12-18
Rights link:
Appears in Collections:Lehrstuhl Baumechanik

Files in This Item:
File Description SizeFormat 
Mellios2021_Article_FiniteElementModellingOfUHPCUn.pdf3.49 MBAdobe PDFView/Open

This item is protected by original copyright

This item is licensed under a Creative Commons License Creative Commons