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research-article

Numerical modeling and dynamic analysis of a floating bridge subjected to wind, wave and current loads

[+] Author and Article Information
Zhengshun Cheng

Department of Marine Technology, Centre for Autonomous Marine, Operations and Systems (AMOS), Norwegian University of Science and Technology (NTNU), Trondheim, 7491, Norway
zhengshun.cheng@gmail.com

Zhen Gao

Department of Marine Technology, Centre for Autonomous Marine, Operations and Systems (AMOS), Norwegian University of Science and Technology (NTNU), Trondheim, 7491, Norway
zhen.gao@ntnu.no

Torgeir Moan

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

1Corresponding author.

ASME doi:10.1115/1.4040561 History: Received April 03, 2018; Revised June 05, 2018

Abstract

Designing reliable and cost-effective floating bridges for wide and deep fjords is very challenging. The floating bridge is subjected to various environmental loads, such as wind, wave, and current loads. All these loads and associated load effects should be properly evaluated for ultimate limit state design check. In this study, the wind-, wave-, and current-induced load effects are comprehensively investigated for an end-anchored curved floating bridge, which was an early concept for crossing the Bj⊘rnafjorden. The considered floating bridge is about 4600 m long and consists of a cable-stayed high bridge part and a pontoon-supported low bridge part. It also has a number of eigen-modes, which might be excited by the environmental loads. Modeling of wind loads on the bridge girder is firstly studied, indicating that apart from aerodynamic drag force, aerodynamic lift and moment on the bridge girder should also be considered due to their significant contribution to axial force. Turbulent wind spectrum and spatial coherence play an important role and should also be properly determined. The sway motion, axial force and strong axis bending moment of the bridge girder are mainly induced by wind loads, while the heave motion, weak axis bending moment and torsional moment are mainly induced by wave loads. Turbulent wind can cause significant larger low-frequency eigen-mode resonant responses than the second-order difference frequency wave loads. Current loads mainly contribute damping and reduce the variations of sway motion, axial force and strong axis bending moment.

Copyright (c) 2018 by ASME
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