PhD (Civil/Structural Engineering) 2017 - Stellenbosch University, South Africa. Thesis: "Steel Fibre-Reinforced Concrete: Multi-scale Characterisation towards Numerical Modelling"; Laboratory Manager: Structure & Building Materials Laboratory, Department of Civil Engineering, Stellenbosch University (2013 to present); BEng (Civil) cum laude 2010 - Stellenbosch Unversity, South Africa Supervisors: Prof. Gideon P.A.G van Zijl
Computational Modelling of Concrete and Concrete Structures, 2018
The Mode I and Mode II fracture of steel fibre-reinforced self-consolidating concrete is investig... more The Mode I and Mode II fracture of steel fibre-reinforced self-consolidating concrete is investigated experimentally at two scales of observation, namely at the scale of a single fibre (Micro-scale) and at the scale of a single localised crack (Meso-scale). The Meso-scale data is used to calibrate and validate a material model implemented in a numerical procedure via a user material (UMAT) in the commercial finite element package Abaqus. An empirical model reconciles the fibre component characterised via a single fibre transverse pull-out test with the composite Iosipescu shear test.
NTERNATIONAL CONFERENCE ON STRUCTURAL ENGINEERING, MECHANICS AND COMPUTATION, 2013
The shear behaviour of reinforced steel fibre concrete (RSFC) has undergone extensive research ov... more The shear behaviour of reinforced steel fibre concrete (RSFC) has undergone extensive research over the past 40 years. A comprehensive review of the literature is therefore essential in order to extend on the existing research. This paper will convey the origin, development and current status of the research topic and field, identifying the key issues and developments. In order to define the role and objectives of this research, this state-of-the-art will introduce a summary of the main findings from the primary research contributors and will present and evaluate to a limited extent the prominent research methodologies employed, both from an experimental design and modelling perspective. In conclusion, a research proposal will be established, based on the findings contained herein.
International Conference on Construction Materials (ConMat'15), 2015
An experimental investigation is undertaken to characterise the shear-dominant fracture mode of a... more An experimental investigation is undertaken to characterise the shear-dominant fracture mode of a self-consolidating mortar reinforced with short hooked-end steel fibres. The material is investigated at two levels of observation, composite-level and single fibre level, in order to isolate and quantify the shear transfer mechanism of the fibre reinforcement. The Ohno-beam/Iosipescu shear test method is adapted to test both the single fibre and composite behaviour. An optical measurment system is used to capture displacement on the surface of the specimen. The data obtained from the single fibre tests matches well with the results obtained from other researchers, using different testing methods. Finally, an empirical model is developed utilising the single fibre data, as well as an approximation of the fibre count and fibre orientation distribution, and is validated with the composite response.
Computational Modelling of Concrete and Concrete Structures, 2018
The Mode I and Mode II fracture of steel fibre-reinforced self-consolidating concrete is investig... more The Mode I and Mode II fracture of steel fibre-reinforced self-consolidating concrete is investigated experimentally at two scales of observation, namely at the scale of a single fibre (Micro-scale) and at the scale of a single localised crack (Meso-scale). The Meso-scale data is used to calibrate and validate a material model implemented in a numerical procedure via a user material (UMAT) in the commercial finite element package Abaqus. An empirical model reconciles the fibre component characterised via a single fibre transverse pull-out test with the composite Iosipescu shear test.
NTERNATIONAL CONFERENCE ON STRUCTURAL ENGINEERING, MECHANICS AND COMPUTATION, 2013
The shear behaviour of reinforced steel fibre concrete (RSFC) has undergone extensive research ov... more The shear behaviour of reinforced steel fibre concrete (RSFC) has undergone extensive research over the past 40 years. A comprehensive review of the literature is therefore essential in order to extend on the existing research. This paper will convey the origin, development and current status of the research topic and field, identifying the key issues and developments. In order to define the role and objectives of this research, this state-of-the-art will introduce a summary of the main findings from the primary research contributors and will present and evaluate to a limited extent the prominent research methodologies employed, both from an experimental design and modelling perspective. In conclusion, a research proposal will be established, based on the findings contained herein.
International Conference on Construction Materials (ConMat'15), 2015
An experimental investigation is undertaken to characterise the shear-dominant fracture mode of a... more An experimental investigation is undertaken to characterise the shear-dominant fracture mode of a self-consolidating mortar reinforced with short hooked-end steel fibres. The material is investigated at two levels of observation, composite-level and single fibre level, in order to isolate and quantify the shear transfer mechanism of the fibre reinforcement. The Ohno-beam/Iosipescu shear test method is adapted to test both the single fibre and composite behaviour. An optical measurment system is used to capture displacement on the surface of the specimen. The data obtained from the single fibre tests matches well with the results obtained from other researchers, using different testing methods. Finally, an empirical model is developed utilising the single fibre data, as well as an approximation of the fibre count and fibre orientation distribution, and is validated with the composite response.
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Papers by Stephan Zeranka