A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
16.18: DYNA® link anchor box: Innovative structure for anchoring stay cables
Cable stayed and extradosed bridges are often designed with saddles at the pylon. This results in slender dimensions of the pylon and reduced costs as access shafts within the pylon can be omitted. However, inspection of the deviated strands within the saddle is only possible after exchanging single strands or the complete cable. Furthermore, differential forces in the cables are often transferred within the saddle by friction only. Also, cable installation and stressing have to be carried out simultaneously on both fronts of the form traveller for the most common balanced free cantilever construction method.
To find an alternative solution for an improved performance of pylon design, installation cycle and cable inspection, a new curved anchor box has been developed. The DYNA® Link anchor box consists of two sections: in the concrete, there are two steel beams with shear studs for transferring the cable load into the concrete pylon; outside, the concrete the steel beams are connected to each other, and a bearing plate is welded to the steel beams as support for the cable anchorage. An opening at the steel beam provides access for installation and inspection of the cable anchorage. Through this steel anchor box, which is embedded in the solid concrete pylon, two stay cable anchorages are linked to each other and are located outside the pylon. With this design, all advantages of common saddles are kept; the disadvantages are compensated by using a steel composite structure which can be designed and calculated according to national or international standards. In doing so, elaborate testing in accordance to international cable guidelines such as fib or PTI can be omitted as well.
16.18: DYNA® link anchor box: Innovative structure for anchoring stay cables
Cable stayed and extradosed bridges are often designed with saddles at the pylon. This results in slender dimensions of the pylon and reduced costs as access shafts within the pylon can be omitted. However, inspection of the deviated strands within the saddle is only possible after exchanging single strands or the complete cable. Furthermore, differential forces in the cables are often transferred within the saddle by friction only. Also, cable installation and stressing have to be carried out simultaneously on both fronts of the form traveller for the most common balanced free cantilever construction method.
To find an alternative solution for an improved performance of pylon design, installation cycle and cable inspection, a new curved anchor box has been developed. The DYNA® Link anchor box consists of two sections: in the concrete, there are two steel beams with shear studs for transferring the cable load into the concrete pylon; outside, the concrete the steel beams are connected to each other, and a bearing plate is welded to the steel beams as support for the cable anchorage. An opening at the steel beam provides access for installation and inspection of the cable anchorage. Through this steel anchor box, which is embedded in the solid concrete pylon, two stay cable anchorages are linked to each other and are located outside the pylon. With this design, all advantages of common saddles are kept; the disadvantages are compensated by using a steel composite structure which can be designed and calculated according to national or international standards. In doing so, elaborate testing in accordance to international cable guidelines such as fib or PTI can be omitted as well.
16.18: DYNA® link anchor box: Innovative structure for anchoring stay cables
Gawlista, Jannik (author) / Kasper, Marcel (author) / Schraml, Marcus (author) / Brand, Werner (author)
ce/papers ; 1 ; 4192-4198
2017-09-01
7 pages
Article (Journal)
Electronic Resource
English
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