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A platform for research: civil engineering, architecture and urbanism
Strengthening of concrete structures with prestressed and gradually anchored carbon fibre reinforced plastic (CFRP) strips
Strengthening of concrete structures with passive CFRP strips is state of the art. By prestressing these strips, the effectiveness of the reinforcement can be improved considerably. However, its application has been limited to demonstration projects only due to anchorage problems at the end of the strips. To overcome this problem the strips can be bonded with a decreasing prestressing force towards their ends. To generate this gradient a prestressing device was designed at which the strip is wrapped partly around a cylinder. This way, the prestressing force at the clamp of the strip can be reduced considerably, depending on the coefficient of friction between the strip and the prestressing device. The use of an aircushion provides an easy and comfortable way to press the strip against the structure during the entire curing process. The gradient is approached by a stepwise bonding with decreasing prestressing force. The result is a prestressed CFRP strip without any external anchorage systems. Tests on a concrete beam post-strengthened with prestressed and gradually anchored CFRP strips showed a considerable increase of the cracking load and the ultimate load. The beam behaves much more stiffer than the one with the nonprestressed CFRP strips.
Strengthening of concrete structures with prestressed and gradually anchored carbon fibre reinforced plastic (CFRP) strips
Strengthening of concrete structures with passive CFRP strips is state of the art. By prestressing these strips, the effectiveness of the reinforcement can be improved considerably. However, its application has been limited to demonstration projects only due to anchorage problems at the end of the strips. To overcome this problem the strips can be bonded with a decreasing prestressing force towards their ends. To generate this gradient a prestressing device was designed at which the strip is wrapped partly around a cylinder. This way, the prestressing force at the clamp of the strip can be reduced considerably, depending on the coefficient of friction between the strip and the prestressing device. The use of an aircushion provides an easy and comfortable way to press the strip against the structure during the entire curing process. The gradient is approached by a stepwise bonding with decreasing prestressing force. The result is a prestressed CFRP strip without any external anchorage systems. Tests on a concrete beam post-strengthened with prestressed and gradually anchored CFRP strips showed a considerable increase of the cracking load and the ultimate load. The beam behaves much more stiffer than the one with the nonprestressed CFRP strips.
Strengthening of concrete structures with prestressed and gradually anchored carbon fibre reinforced plastic (CFRP) strips
Stöcklin, I. (author) / Meier, U. (author)
2002
6 Seiten, 9 Bilder, 1 Tabelle, 2 Quellen
Conference paper
English
| British Library Conference Proceedings | 2002
| British Library Conference Proceedings | 2002
Strengthening of concrete structures with prestressed and gradually anchored CFRP strips
| British Library Conference Proceedings | 2001
| British Library Conference Proceedings | 2003
Effects of Gradually Anchored Prestressed CFRP Strips Bonded on Prestressed Concrete Beams
| Online Contents | 2008