A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Test and Analysis of Prestressed Ultra High Performance Concrete Beams
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’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%.
Test and Analysis of Prestressed Ultra High Performance Concrete Beams
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’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%.
Test and Analysis of Prestressed Ultra High Performance Concrete Beams
RILEM Bookseries
Ferrara, Liberato (editor) / Muciaccia, Giovanni (editor) / di Summa, Davide (editor) / Ulfkjaer, Jens Peder (author) / Brosbøl, Daniel Peter (author) / Larsen, Rasmus (author) / Clausen, Johan (author)
RILEM Spring Convention and Conference ; 2024 ; Milan, Italy
Proceedings of the RILEM Spring Convention and Conference 2024 ; Chapter: 21 ; 184-193
RILEM Bookseries ; 56
2024-11-07
10 pages
Article/Chapter (Book)
Electronic Resource
English
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