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Technical Brief

A Time-Domain Method for Hydroelasticity of a Curved Floating Bridge in Inhomogeneous Waves

[+] Author and Article Information
Wei Wei

State Key Laboratory of Ocean Engineering,
Collaborative Innovation Center for Advanced Ship and
Deep-Sea Exploration,
Shanghai Jiao Tong University,
Shanghai 200240, China;
Offshore Engineering Technology Center of CCS,
Tianjin 300457, China
e-mails: weiwei_allen@126.com; weiwei@ccs.org.cn

Shixiao Fu

State Key Laboratory of Ocean Engineering,
Collaborative Innovation Center for Advanced Ship and
Deep-Sea Exploration,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: shixiao.fu@sjtu.edu.cn

Torgeir Moan

Department of Marine Technology,
Centre for Autonomous Marine Operations and
Systems (AMOS),
Norwegian University of Science and Technology,
Trondheim 7491, Norway
e-mail: torgeir.moan@ntnu.no

Chunhui Song

State Key Laboratory of Ocean Engineering,
Collaborative Innovation Center for Advanced Ship and
Deep-Sea Exploration,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: chunhui.song@sjtu.edu.cn

Shi Deng

Department of Marine Technology,
Norwegian University of Science and Technology,
Trondheim 7491, Norway
e-mail: shi.deng@ntnu.no

Halvor Lie

SINTEF Ocean,
Trondheim NO-7052, Norway
e-mail: Halvor.Lie@sintef.no

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received September 12, 2017; final manuscript received September 20, 2018; published online November 8, 2018. Assoc. Editor: Ron Riggs.

J. Offshore Mech. Arct. Eng 141(1), 014501 (Nov 08, 2018) (8 pages) Paper No: OMAE-17-1163; doi: 10.1115/1.4041581 History: Received September 12, 2017; Revised September 20, 2018

This paper presents a time-domain hydroelastic analysis method for bridges supported by floating pontoons in inhomogeneous wave conditions. The inhomogeneous wave effect is accounted for by adopting different wave spectra over different regions along the structure, then the time history of inhomogeneous first-order wave excitation forces on the floating pontoons can be obtained. The frequency-domain hydrodynamic coefficients are transformed into the time-domain hydroelastic model using Cummins' equations. The linear hydroelastic responses of a curved floating bridge with end supports, subjected to irregular waves with spatially varying significant wave heights and peak periods, are investigated. Moreover, sensitive analyses are performed to study the effects of the inhomogeneity on the hydroelastic responses. The primary results indicate that the inhomogeneity of the waves has a significant effect on the dynamic responses of the floating bridge.

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References

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Figures

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Fig. 1

Coordinate system of multiple floating body system

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Fig. 2

The deformation of the beam

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Fig. 3

The description of inhomogeneous sea environment

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Fig. 4

Numerical model for the floating bridge concept [21]

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Fig. 6

Distribution of inhomogeneous wave field

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Fig. 7

The significant values of displacements along the longitudinal direction of the bridge in the homogenous and inhomogeneous wave conditions for a wave direction of 270 deg: (a) vertical displacement and (b) horizontal displacement

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Fig. 8

The significant values of moments of each connecting beam in its local coordinate system in the homogenous and inhomogeneous wave conditions for a wave direction of 270 deg: (a) vertical bending moment and (b) horizontal bending moment

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Fig. 9

The significant values of torsional angle and moment in the homogenous and inhomogeneous waves for the wave direction of 270 deg: (a) torsional angle and (b) torsional moment

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Fig. 10

The significant values of displacements and moments along the longitudinal direction of the structure with a different number of inhomogeneous regions for the wave direction of 270 deg: (a) vertical displacement, (b) vertical bending moment, (c) horizontal displacement, (d) horizontal bending moment, (e) torsional angle, and (f) torsional moment

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