Abstract
The Norwegian Public Roads Administration is currently planning a ferry-free Coastal Highway Route E39. Floating bridges represent feasible options in this project with already two long span floating bridges in function, i.e. the Bergsøysund and Nordhordaland Bridges. In connection with this project, one of the main objectives is to quantify the accuracy of the numerical methods used to predict dynamic behaviour of floating bridges. An extensive monitoring system is installed to measure structural response as well as environmental actions from wind and waves on an existing floating bridge: the Bergsøysund Bridge. These measurements are used to estimate the modal system properties of the structure. The system identification is performed using a parametric time-domain Stochastic Subspace Identification method as well as the Frequency Domain Decomposition method. Challenges of system identification for highly damped structural systems, such as a floating bridge, are especially emphasized. The results are also compared with numerical predictions from a two part combined linear frequency-domain model set-up. The first part consists of a hydrodynamic model, including wave excitation as well as fluid-structure interaction, and relies on linearized potential theory. The results from this are thereafter introduced into a finite element model, for a complete structural dynamic analysis.
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References
Watanabe E (2003) Floating bridges: past and present. Struct Eng Int 13(2):128–132
McLamore VR, Hart GC, Stubbs IR (1971) Ambient vibration of two suspension bridges. J Struct Div 97(10):2567–2582
Abdel-Ghaffar A, Scanlan R (1985) Ambient vibration studies of Golden Gate Bridge: I. Suspended structure. J Eng Mech 111(4):463–482
Brincker R, Zhang L, Andersen P (2001) Modal identification of output-only systems using frequency domain decomposition. Smart Mater Struct 10(3):441
Trefethen LN, Bau III D (1997) Numerical linear algebra, vol 50. SIAM
Van Overschee P, De Moor B, Van Overschee P, De Moor B (1993) Subspace algorithms for the stochastic identification problem. Automatica 29(3):649–660
Van Overschee P, De Moor B (1996) Subspace identification for linear systems: theory, implementation, applications. Kluwer Academic Publishers, Boston/London/Dordrecht
Brownjohn JMW, Magalhaes F, Caetano E, Cunha A (2010) Ambient vibration re-testing and operational modal analysis of the Humber Bridge. Eng Struct 32(8):2003–2018
Andersen P, Brincker R, Peeters B, De Roeck G, Hermans L, Krämer C (1999) Comparison of system identification methods using ambient bridge test data. In: Proceedings of the 17th international modal analysis conference, Kissimee, pp 7–10
Naess A, Moan T (2012) Stochastic dynamics of marine structures. Cambridge University Press, New York
Kvåle KA, Øiseth O, Sigbjörnsson R (2014) Modelling of the stochastic dynamic behaviour of the Bergsøysund Bridge: an application of the power spectral density method. In: Proceedings of the 9th international conference on structural dynamics, EURODYN 2014, Porto, pp 2921–2928
Welch PD (1967) The use of fast Fourier transform for the estimation of power spectra: a method based on time averaging over short, modified periodograms. IEEE Trans Audio Electroacoust 15(2):70–73
Brincker R, Ventura C, Andersen P (2001) Damping estimation by frequency domain decomposition. In: 19th international modal analysis conference, Kissimmee, pp 698–703
Rainieri C, Fabbrocino G (2014) Operational modal analysis of civil engineering structures. Springer, New York
Allemang RJ (2003) The modal assurance criterion–twenty years of use and abuse. Sound Vib 37(8):14–23
Acknowledgements
We would like to thank Sindre Hermstad for his work on the Abaqus model used. This research was carried out with financial support from the Norwegian Public Roads Administration. The authors greatly acknowledge this support.
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© 2015 The Society for Experimental Mechanics, Inc.
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Kvåle, K.A., Øiseth, O., Rønnquist, A., Sigbjörnsson, R. (2015). Modal Analysis of a Floating Bridge Without Side-Mooring. In: Caicedo, J., Pakzad, S. (eds) Dynamics of Civil Structures, Volume 2. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-15248-6_14
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DOI: https://doi.org/10.1007/978-3-319-15248-6_14
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