Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Expansion anchors in high performance fiber reinforced concrete
High performance concrete (HPC) is used in increasing volume. Also the use of post-installed anchors is common both in retrofit and in new construction because of their flexibility and high load carrying capacity. However, due to the lack of experimental observations on the use of anchors in HPC, the standard rules proposed for normal strength concrete cannot be applied. This paper presents the mechanical behavior of expansion anchors embedded in high performance concrete, with and without steel microfibers, subjected to tensile tests. Compressive strength, addition of fibers and embedment length were adopted as major factors. In particular, the failure mode was studied with reference to the embedment length and to fibers added to the matrix (0-1%). The embedment length influences the results both in terms of strength and ductility, while fibers strongly affect only the post-peak behavior and the failure pattern. A comparison between the results and the strength given by the producer for a normal concrete shows that high-performance concrete leads to a significant increase of the strength. The influence of the major factors on the results, in terms of strength, stiffness, failure mode and failure pattern, is also discussed. Finally, a comparison between standard equations and experimental results is provided. The use of HPC led to higher loads than those observed for NSC. By reducing the embedment length, a reduction in the ultimate load and a more brittle behavior was observed (values similar to NSC). However, the concrete C90F exhibited similar behavior for the different embedment lengths. Fibers did not affect significantly the ultimate load only for concrete C75. A wide non linear phase before the peak load was observed. The specimens without fibers exhibited a more brittle behavior. In addition, fibers have a strong influence also on the cracking pattern and on the dimension of the concrete cone. Indeed, reduced cracking pattern and cone were observed in specimens with fibers. The CCD method is suitable for NSC or for HPC with very small embedment length, whilst the ACI prescription seems to be more suitable for HPC.
Expansion anchors in high performance fiber reinforced concrete
High performance concrete (HPC) is used in increasing volume. Also the use of post-installed anchors is common both in retrofit and in new construction because of their flexibility and high load carrying capacity. However, due to the lack of experimental observations on the use of anchors in HPC, the standard rules proposed for normal strength concrete cannot be applied. This paper presents the mechanical behavior of expansion anchors embedded in high performance concrete, with and without steel microfibers, subjected to tensile tests. Compressive strength, addition of fibers and embedment length were adopted as major factors. In particular, the failure mode was studied with reference to the embedment length and to fibers added to the matrix (0-1%). The embedment length influences the results both in terms of strength and ductility, while fibers strongly affect only the post-peak behavior and the failure pattern. A comparison between the results and the strength given by the producer for a normal concrete shows that high-performance concrete leads to a significant increase of the strength. The influence of the major factors on the results, in terms of strength, stiffness, failure mode and failure pattern, is also discussed. Finally, a comparison between standard equations and experimental results is provided. The use of HPC led to higher loads than those observed for NSC. By reducing the embedment length, a reduction in the ultimate load and a more brittle behavior was observed (values similar to NSC). However, the concrete C90F exhibited similar behavior for the different embedment lengths. Fibers did not affect significantly the ultimate load only for concrete C75. A wide non linear phase before the peak load was observed. The specimens without fibers exhibited a more brittle behavior. In addition, fibers have a strong influence also on the cracking pattern and on the dimension of the concrete cone. Indeed, reduced cracking pattern and cone were observed in specimens with fibers. The CCD method is suitable for NSC or for HPC with very small embedment length, whilst the ACI prescription seems to be more suitable for HPC.
Expansion anchors in high performance fiber reinforced concrete
Cattaneo, Sara (Autor:in) / Rosati, Gianpaolo (Autor:in)
2004
10 Seiten, 12 Bilder, 2 Tabellen, 10 Quellen
Aufsatz (Konferenz)
Englisch
Expansion anchors in high performance fiber reinforced concrete
| British Library Conference Proceedings | 2004
Wedge-Type Expansion Anchors in High-Performance Concrete
| Online Contents | 2007
Tensile performance of inclined adhesive anchors in steel fiber‐reinforced concrete
| Wiley | 2025
Pullout Tests on Post-installed Bonded Anchors in Ultra-high Performance Fiber Reinforced Concrete
| Taylor & Francis Verlag | 2019