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Article type: Research Article
Authors: Gjerding-Smith, K. | Johnsen, R. | Lange, H.I. | Leinum, B.H. | Gundersen, G. | Isaksen, B. | Nærum, G.
Affiliations: Consulting Engineers Haug og Blom-Bakke AS, Oslo, Norway | The Norwegian University of Science and Technology (NTNU), Trondheim, Norway | SINTEF, Trondheim, Norway | Det Norske Veritas, Oslo, Norway | Norwegian Public Roads Administration, Oslo, Norway
Note: [] Corresponding author. Email: [email protected]
Abstract: Wire fractures in the main cables of the Lysefjord Suspension Bridge display an approximate linear relationship with time. Uncertainties related to wire fractures in sub-layers, reduction of load-carrying capacity and lifetime, and future development of wire fractures have prompted extensive investigations of the main cables. Failure analyses of fractured Z-wire samples and fracture mechanics analysis concluded that cracks have initiated and propagated from surface imperfections. The potential for hydrogen atom generation and absorption that causes hydrogen-induced cracking is discussed. Hydrogen atoms result from the hot-dip galvanization process, or due to corrosion. Evaluation of remaining load-carrying capacity and the need for strengthening of the main cables are briefly discussed and methods for surveillance of wire fractures are presented.
Keywords: Suspension bridge, Cable wire, Failure analysis, Fracture mechanics, Corrosion, High-strength steel
DOI: 10.1080/15732480600852104
Journal: Bridge Structures, vol. 2, no. 2, pp. 63-77, 2006
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