Bond Performance of Sand Coated UHM CFRP Tendons in High Performance Concrete
| Autor: | Michele Griffa, Francesco Messina, Pietro Lura, Giovanni P. Terrasi, Tobias Dominik Lämmlein |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
musculoskeletal diseases
Materials science UHM carbon fibre Polymers and Plastics Pull-out test prestressing tendon 0211 other engineering and technologies CFRP UTS carbon fibre sand coated bond HPC pull-out test finite element modelling (FEM) X-ray tomography Modulus 02 engineering and technology Article Finite element modelling (FEM) lcsh:QD241-441 lcsh:Organic chemistry 021105 building & construction medicine Shear stress Composite material Bond strength Stiffness General Chemistry 021001 nanoscience & nanotechnology musculoskeletal system Grain size Finite element method Tendon medicine.anatomical_structure medicine.symptom 0210 nano-technology Material properties |
| Zdroj: | Polymers; Volume 9; Issue 2; Pages: 78 Polymers, Vol 9, Iss 2, p 78 (2017) Polymers, 9 (2) Polymers |
| ISSN: | 2073-4360 |
| DOI: | 10.3929/ethz-b-000191206 |
| Popis: | The bond behaviour of novel, sand-coated ultra-high modulus (UHM) carbon fibre reinforced polymers (CFRP) tendons to high performance concrete (HPC) was studied by a combined numerical and experimental approach. A series of pull-out tests revealed that the failure type can vary between sudden and continuous pull-out depending on the chosen sand coating grain size. Measuring the same shear stress vs. tendon draw-in (τ-δ) curves in the same test set-up, for sand coated CFRP tendons with a longitudinal stiffness of 137 and 509 GPa, respectively, indicated that the absolute bond strength in both cases was not influenced by the tendon’s stiffness. However, the τ-δ curves significantly differed in terms of the draw-in rate, showing higher draw-in rate for the UHM CFRP tendon. With the aid of X-ray computed tomography (CT), scanning electron microscopy (SEM) and visual analysis methods, the bond failure interface was located between the CFRP tendon and the surrounding sand-epoxy layer. For further investigation, a simplified finite element analysis (FEA) of the tendon pull-out was performed using a cohesive surface interaction model and the software Abaqus 6.14. A parametric study, varying the tendon-related material properties, revealed the tendon’s longitudinal stiffness to be the only contributor to the difference in the τ-δ curves found in the experiments, thus to the shear stress transfer behaviour between the CFRP tendon and the concrete. In conclusion, the excellent bond of the sand-coated UHM CFRP tendons to HPC as well as the deeper insight in the bond failure mechanism encourages the application of UHM CFRP tendons for prestressing applications. Polymers, 9 (2) ISSN:2073-4360 |
| Databáze: | OpenAIRE |
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