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In ultra‐high performance concrete (UHPC) embedded micro steel fibres increase the ductility and improve the post cracking load‐bearing behaviour under tensile loading. For an efficent and economical dimensioning of components, especially for fatigue susceptible structures, it is necessary to characterise the crack‐bridging load‐bearing effect of the micro steel fibres and the associated processes...
Ultra‐high performance fiber‐reinforced concrete (UHPFRC) is usually applied for thin‐walled and lean constructions because of its excellent mechanical properties. However, these lightweight constructions such as bridge girders, masts, towers, and railway tracks, for example, are susceptible to oscillations due to cyclic loading. A model describing the fatigue behavior of UHPFRC is required. Therefore,...
Ultra‐high performance concrete with a compressive strength of more than 140 N/mm2 reacts very brittle without the addition of fibres. At designing economical and resource‐efficient building components as well as performance‐optimized materials, the supporting effects of the additional microfibres must be considered. Prospectively, cyclic loading and the fatigue behaviour of high performance materials...
An approach to model the deterioration of steel structures is presented by transferring the results of a continuum damage mechanics analysis to an extended beam model which can account for the loss of structural integrity.
Damage starts at the microscopic level by the initiation, growth and coalescence of voids with decreasing material resistance followed by the formation of microcracks at the mesoscale...
The presented model allows for the description of the most important coupled processes in porous media, whereby focus is laid on concrete structures. It can be employed for a consistent numerical analysis within a monolithic solution algorithm. Mechanical processes are coupled with transport processes, e.g. of energy and humidity, as well as with chemical processes like depassivation due to chloride...
A non‐linear bond model is presented, capturing bond behaviour between concrete and reinforcing ribbed steel bars. An existing model, where coupled thermal‐hygric‐mechanical‐chemical (THMC‐) processes are already modelled for pure concrete, will be extended by the presented bond model. Against this background and due to the resulting requirements the approach of a geometrically consistent consideration...
In order to describe the time-dependent inelastic behavior of steel structures up to failure, a material model is developed within the framework of thermodynamics considering viscoplastic material behavior, isotropic hardening, softening, and isotropic ductile damage. Since softening and damage lead to localization of deformations, the model is extended by a non-local implicit gradient formulation...
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