@inbook{da34515ede2c4cb38702cbb31e33ba44,
title = "Test and Analysis of Prestressed Ultra High Performance Concrete Beams",
abstract = "Ultra-high-performance steel fibre reinforced concrete (UHPSFRC) combines the benefits of ultra-high-performance concrete with the added reinforcement of steel fibres. The durability of UHPSFRC can contribute to sustainable construction practices. Its strength can lead to longer-lasting structures, reducing the need for frequent repairs or replacements. Using UHPSFRC poses the possibility of a decrease in Global Warming Potential (GWP) compared to normal-strength concrete per available m2 in residential and office buildings. Implementation of prestressing could reduce GWP even further. Deformations are often a problem when designing structures. From this came the idea of combining the two. In the present study 9 beams with the same reinforcement arrangement have been tested. Three were not prestressed, three were pre-tensioned, and the last three were post-tensioned. Cylinders and small beams were tested for reference parameters, strength, and fracture energy. The results of the tests are presented as load-displacement curves at several points along the beam axis and at the mid-point. A semi-analytical model governed by beam theory and the principle of virtual work is proposed. A software package developed in MATLAB allows for a wide range of possible beam cross-sections and non-linear material models. It is a proposal for a faster evaluation of the deflection behaviour of a concrete beam compared to i.e. FEM. The general idea of the methods is that a numerical iterative method can be utilised to investigate the member{\textquoteright}s method, calibrate the parameters, and predict the response. The model assumes that individual beam cross-sections remain planar, equilibrium between internal and external forces and non-linear constitutive models for the materials, including a Fictitious Crack Model for UHPSFRC. The agreement between tests and the model is very good. The GWP is compared between a beam of normal-strength concrete (C40) and a pre-stressed UHPSFRC with the same performance parameters and shows a reduction in GWP of 20.7\%.",
keywords = "deflection, GWP, iterative, pre-stressing, UHPSFRC",
author = "Ulfkjaer, \{Jens Peder\} and Brosb{\o}l, \{Daniel Peter\} and Rasmus Larsen and Johan Clausen",
note = "Publisher Copyright: {\textcopyright} The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.",
year = "2025",
doi = "10.1007/978-3-031-70281-5\_21",
language = "English",
series = "RILEM Bookseries",
publisher = "Springer Science and Business Media B.V.",
pages = "184--193",
booktitle = "RILEM Bookseries",
address = "Germany",
}