Publications

Numerical multi-level model for fiber-reinforced concrete - Multi-level validation based on an experimental study on high-strength concrete [Numerisches Mehrebenen-Modell für Stahlfaserbeton: Von der Faser- zur Bauteilebene: Mehrstufige Validierung anhand einer experimentellen Studie an hochfestem Faserbeton]

Gudžulic, V. and Neu, G.E. and Gebuhr, G. and Anders, S. and Meschke, G.

BETON- UND STAHLBETONBAU
Volume: 115 Pages: 146-157
DOI: 10.1002/best.201900067
Published: 2020

Abstract
Numerical multi-level model for fiber-reinforced concrete – Multi-level validation based on an experimental study on high-strength concrete. The contribution systematically examines the predictive capability of a numerical multi-level model for steel fiber reinforced concrete made of high-strength concrete by means of test series performed on the fiber as well as the structure level. The experimental study comprises pull-out tests of Dramix 3D fibers in high-strength concrete with different embedment lengths and inclinations to the crack surface as well as three-point bending tests on notched beams with three significantly different fiber contents. The numerical model is designed to directly track the influence of design parameters such as fiber type, fiber orientation, fiber content and concrete strength on the structural response. For this purpose, submodels on the single fiber level are combined into a crack bridging model, considering the fiber orientation and the fiber content, and are integrated into a finite element model for the purpose of numerical structural analysis. The validation of the models for hooked-end steel fibers shows that the interaction mechanisms between fiber and high-strength concrete are realistically captured for all investigated cases (fiber inclinations, embedment lengths). On the structural level, the load-displacement diagrams from the numerical simulations show a good agreement of the peak load as well as the post-peak behavior for all fiber contents. © 2020, Ernst und Sohn. All rights reserved.

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