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Second-Order Hydroelastic Analysis of a Fjord Crossing Floating Bridge Under Spatially Inhomogeneous Wave Fields
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DOI：10.1016/j.eng.2026.07.023.png)
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Abstract
En 中文
The extensive span of very large floating structures (VLFS) and the characteristics of their service environment require a comprehensive consideration of second-order wave loads and inhomogeneous wave conditions during hydroelastic analysis. Previous studies have treated the two factors separately or applied the Newman’s approximation (NA) for low-frequency wave loads, thus introducing uncertainties into the analysis. In this study, the beam-connected-discrete-modules (BCDM) hydroelastic method was applied to evaluate the hydroelastic response of a VLFS. A pontoon-supported floating bridge was used as an example, considering both the effects of complete low-frequency wave loads and an inhomogeneous wave field. The practicality of applying the NA to estimate the low-frequency wave loads for the VLFS is also discussed. Moreover, due to the enormous computational burden for obtaining the full quadratic transfer functions (QTF) of all pontoons directly, this study simplified the process by ignoring the influence of first-order motions on low-frequency wave loads and hydrodynamic interaction between pontoons. This simplification allows the full QTF of all pontoons to be indirectly calculated by incorporating spatial phases into the QTF of individual pontoons. Therefore, the impact of spatial phases on low-frequency wave loads is also discussed. The results show that the inhomogeneous wave field can lead to shifts in generalized wave loads and primary modes. Furthermore, analyses that do not consider both the inhomogeneous wave field and low-frequency wave loads cannot envelop the worst-case scenario. The NA overestimates the QTF under the simplifications assumed in this study. The spatial phase of low-frequency wave loads significantly affects responses dominated by low-order modes. Neglecting them can lead to an unacceptable overestimation of responses dominated by low-order modes.
Keywords:
Verylargefloatingstructures
Beam-connected-discrete-modulesmethod
Inhomogeneouswavefields
Newman’sapproximation
Quadratictransferfunction
Floatingbridge
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