A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The excellent properties of the parallel wire bundles made of carbon fibre reinforced polymers (CFRP) include corrosion resistance, very high specific strength and equivalent modulus and outstanding fatigue behaviour. The key problem facing the application of CFRP cables and thus their widespread use in the future is how to anchor them. A new reliable anchoring scheme produced with gradient materials based upon ceramics and epoxy and its application on a vehicular cable stayed bridge, a post-tensioned space truss bridge and a external post-tensioned two span continuous box girder bridge is described. CFRP wires strips and sheets are members of a growing family of non-metallic tensile elements based on high-strength fibres. These non-corrosive tensile elements composed of endless parallel carbon filaments in a polymer matrix are a highly promising alternative to steep plates or post-strengthening applications, to steel cables for stays, suspenders and post-tensioning where long-term durability is required. CFRP strips and sheets for post-strengthening are already today very successful from an economic point of view due to very easy handling. This is not yet the case for CFRP cables. Such a cable is 3 to 4 times more expensive than a comparable steel cable. Since initial cost is the major and often the only parameter used by bridge owners in decision-making, it is very difficult for CFRP to compete against steel today. A few clients for bridge cables increasingly require worldwide more and more life cycle costing to be carried out. This takes into account the predicted inspection and maintenance costs over the lifetime of the bridge, usually taken as 100 years. Costs are evaluated by calculating the net present value of the expenditure stream using a cash discount rate of typically 6 %. CFRP cables benefit considerably compared with steel in such comparisons. They may also allow in future a break trough in very long span bridge construction.
The excellent properties of the parallel wire bundles made of carbon fibre reinforced polymers (CFRP) include corrosion resistance, very high specific strength and equivalent modulus and outstanding fatigue behaviour. The key problem facing the application of CFRP cables and thus their widespread use in the future is how to anchor them. A new reliable anchoring scheme produced with gradient materials based upon ceramics and epoxy and its application on a vehicular cable stayed bridge, a post-tensioned space truss bridge and a external post-tensioned two span continuous box girder bridge is described. CFRP wires strips and sheets are members of a growing family of non-metallic tensile elements based on high-strength fibres. These non-corrosive tensile elements composed of endless parallel carbon filaments in a polymer matrix are a highly promising alternative to steep plates or post-strengthening applications, to steel cables for stays, suspenders and post-tensioning where long-term durability is required. CFRP strips and sheets for post-strengthening are already today very successful from an economic point of view due to very easy handling. This is not yet the case for CFRP cables. Such a cable is 3 to 4 times more expensive than a comparable steel cable. Since initial cost is the major and often the only parameter used by bridge owners in decision-making, it is very difficult for CFRP to compete against steel today. A few clients for bridge cables increasingly require worldwide more and more life cycle costing to be carried out. This takes into account the predicted inspection and maintenance costs over the lifetime of the bridge, usually taken as 100 years. Costs are evaluated by calculating the net present value of the expenditure stream using a cash discount rate of typically 6 %. CFRP cables benefit considerably compared with steel in such comparisons. They may also allow in future a break trough in very long span bridge construction.
The use of carbon fiber reinforced polymer (CFRP) cables in bridge engineering
Die Einsatzmöglichkeiten von Carbonfaser-Kunststoffkabeln im Brückenbau
Meier, U. (author)
Techtextil, Techtextil Symposium, 8 ; 5 ; 1-6
1999
6 Seiten, 4 Bilder, 8 Quellen
Conference paper
English
| British Library Conference Proceedings | 2003