Floating Bridges in Short-Crested Random Seas

by Bruce L. Hutchison, Glosten Associates Inc, Seattle, WA, USA,
Daniel W. Symonds, Glosten Associates Inc, Seattle, WA, USA,



Document Type: Proceeding Paper

Part of: Dynamic Response of Structures

Abstract:

Four large concrete floating bridges located in Washington State have been the subject of extensive analytical modeling for dynamic response to storm waves. The dynamic analysis of the bridges was performed using impulse response methods in the frequency domain to account for the frequency dependent hydrodynamic mass and damping properties. The short-crested character of the directional storm wave spectra was incorporated in the stochastic integral through the use of a coherency function. Hysteretic structural damping was included in the model, and the responses proved to be quite sensitive to the magnitude of the structural damping. Sensitivities to the central heading angle for the incident directional wave spectra and sensitivities to the magnitude of the wave energy spreading were also examined. Responses were determined for both cracked and uncracked structural properties.



Subject Headings: Concrete bridges | Dynamic structural analysis | Damping | Dynamic analysis | Water waves | Wave spectra | Bridge tests | Fluid-structure interaction | Washington | United States

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