Abstract
Floating bridge and submerged floating tunnel concepts have been developed for the purpose of crossing wide straits with a span length of many kilometers. The frequencies of the first dynamic modes of these structures may typically be of the order of 1 min or more. This implies that amplified dynamic response effects need to be assessed both for the wave-frequency and the low-frequency regimes. The low inherent damping levels for the low-frequency response imply that high dynamic amplification may occur. Computational methods for evaluation of the low-frequency hydrodynamic loading and the associated dynamic response are addressed in the present paper, with a focus on developing simplified procedures. These are also compared to more refined calculation methods. A specific case study is considered for the purpose of illustrating the relative effects of the respective dynamic response components. The example structure is a tunnel with a double cross-section which was developed for crossing of the Sognefjord located at the west coast of Norway.
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Acknowledgements
The support from the Norwegian Road Authorities is greatly acknowledged. Professor Odd Faltinsen is acknowledged for valuable comments and discussions. The work in connection with the numerical bridge model in Abaqus by Master student Senthuran Ravintrakumar is acknowledged. Phd student Jan-Tore H. Horn is acknowledged for the WAMIT analysis and providing the corresponding results.
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Leira, B.J. (2018). On Stochastic Dynamic Second-Order Response Analysis of Marine Bridges. In: Rupakhety, R., Ólafsson, S. (eds) Earthquake Engineering and Structural Dynamics in Memory of Ragnar Sigbjörnsson. ICESD 2017. Geotechnical, Geological and Earthquake Engineering, vol 44. Springer, Cham. https://doi.org/10.1007/978-3-319-62099-2_15
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DOI: https://doi.org/10.1007/978-3-319-62099-2_15
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