Steel-free pre-stressed reinforced concrete may be used in aggressive environments to increase the dura-bility of structural elements by replacing steel with high-resistance fibre composites used for both flexural and shear reinforcement. Since this kind of reinforcement is brittle, the design theory and the technologi-cal features differ from the traditional approach employed for steel pre-stressed concrete. The design of a 10 m long steel-free pre-stressed concrete slab manufactured at Banagher Precast Concrete in the framework of the European Commission funded FP7 project IAPP-Eirocrete is presented in the paper by means of non-linear viscoelastic and elastic-plastic models for the prediction of the service and the ulti-mate limit state flexural behaviour, respectively. Basalt fibre reinforcing bars, whose low elastic modulus allows to limit the instantaneous and time-dependant losses, are used as pre-stressed reinforcement for precast concrete elements. Glass fibre reinforcing bars are used as shear links and to form transversal re-inforcement. Structural polypropylene fibres are added to the concrete mixture in order to improve the toughness of the material and control the shrinkage-induced cracking. The numerical results are then compared with the experimental results obtained on a static test performed on a mock-up element and comments are provided regarding the use of this technological solution.
Design of steel-free pre-stressed reinforced concrete slabs: theory and experimentation
Dal Lago B.;
2016-01-01
Abstract
Steel-free pre-stressed reinforced concrete may be used in aggressive environments to increase the dura-bility of structural elements by replacing steel with high-resistance fibre composites used for both flexural and shear reinforcement. Since this kind of reinforcement is brittle, the design theory and the technologi-cal features differ from the traditional approach employed for steel pre-stressed concrete. The design of a 10 m long steel-free pre-stressed concrete slab manufactured at Banagher Precast Concrete in the framework of the European Commission funded FP7 project IAPP-Eirocrete is presented in the paper by means of non-linear viscoelastic and elastic-plastic models for the prediction of the service and the ulti-mate limit state flexural behaviour, respectively. Basalt fibre reinforcing bars, whose low elastic modulus allows to limit the instantaneous and time-dependant losses, are used as pre-stressed reinforcement for precast concrete elements. Glass fibre reinforcing bars are used as shear links and to form transversal re-inforcement. Structural polypropylene fibres are added to the concrete mixture in order to improve the toughness of the material and control the shrinkage-induced cracking. The numerical results are then compared with the experimental results obtained on a static test performed on a mock-up element and comments are provided regarding the use of this technological solution.
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