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Nonlinear Analysis of Fibre Reinforced Concrete Beams: Influence of fibre orientation and density
Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Department of Structural Engineering.
2014 (English)MasteroppgaveStudent thesis
Abstract [en]

This master thesis examines nonlinear analysis of fibre reinforced concrete in DIANA, what influence changes in fibre orientation and density have on the load capacity and the load-bearing ability when the displacement grows. The most important part of the report are the modeling and results from the analysis. The first part of the report includes background theory for nonlinear analysis to give a better understanding of the analysis. Additionally the report include a literature study, based on earlier research and published material about fibre reinforced concrete and its mechanical properties. Especially the residual tensile strength is interesting, since it is here the fibres become the most useful. Both modeling and analysis have been done in the FEM-program DIANA. The beams were modeled after the rules in NS-EN 14651. Mostly the analysis were run with a displacement control up to a displacement of 4 mm to make it easier to see what influence the specific types of fibre reinforced concrete had on the load-capacity with increasing displacement. Force-controlled analysis were also tested, but most of the analysis stopped shortly after reaching the maximum load-capacity because of convergence. Calculations were done to check the contribution from the fibres to the shear capacity. The calculations were based on a set of rules suggested by COIN. Because of the existence of the notch, the first crack will always occur in the mid-section. The results showed that with a good consistency between the normal vector for the crack and the orientation of the fibres, it would be considerable contributions to the shear capacity. With higher density in the critical area, this contribution would become larger. The results from the analysis showed that up to 45 degrees between the normal vector and the fibre orientation, the fibres would have a positive effect on the load-bearing capacity after larger displacements when cracks have occurred. This thesis shows that through FEM-analysis it is possible to make good models of fibre reinforced concrete. However, more research on strain softening and hardening of FRC, and how to look at local changes, are necessary. In addition a set of design rules should be developed.

Place, publisher, year, edition, pages
Institutt for konstruksjonsteknikk , 2014. , 141 p.
URN: urn:nbn:no:ntnu:diva-26410Local ID: ntnudaim:11574OAI: diva2:747488
Available from: 2014-09-16 Created: 2014-09-16 Last updated: 2014-09-16Bibliographically approved

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