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research-article

HYDRODYNAMICAL ASPECTS OF PONTOON OPTIMIZATION FOR A SIDE-ANCHORED FLOATING BRIDGE

[+] Author and Article Information
Arnt G. Fredriksen

Multiconsult AS, Kval⊘yvegen 156, 9013 Troms⊘, Norway
arnt.fredriksen@multiconsult.no

Mads F. Heiervang

Entail AS, G⊘teborggata 27b, 0566, Oslo, Norway
mads@entail.no

Per Norum Larsen

Johs Holt AS, Plogveien 1, 0679 Oslo, Norway
PerNorum.Larsen@johsholt.no

Pål Gr⊘the Sandnes

Entail AS, G⊘teborggata 27b, 0566, Oslo, Norway
paal@entail.no

Bernt S⊘rby

Entail AS, G⊘teborggata 27b, 0566, Oslo, Norway
bernt@entail.no

Basile Bonnemaire

Ler⊘y Seafood Group, Postboks 2123, 9767 Troms⊘, Norway
basile.bonnemaire@leroy.no

Anders Nesteby

Multiconsult AS, Storgata 35, 1607 Fredrikstad, Norway
anders.nesteby@multiconsult.no

Øyvind Nedreb⊘

Norwegian Public Road Administration, Region vest, Postboks 43, 6861 Leikanger, Norway
oyvind.nedrebo@vegvesen.no

1Corresponding author.

ASME doi:10.1115/1.4042420 History: Received December 06, 2017; Revised December 21, 2018

Abstract

Long floating bridges supported by pontoons with spanwidths between 100 m and 200 m are discrete hydro-elastic structures with many critical eigenmodes. The response of the bridge girder is dominated by vertical eigenmodes and coupled horizontal modes (lateral) and rotational modes (about the longitudinal axis of the bridge girder). In this paper it is focused on design principles to reduce the response with regards to these eigenmodes. It is shown for a floating bridge with 200m span-width that by inserting a bottom flange the vertical eigenmodes can be lifted out of wind driven wave regime. It is also shown that selecting a pontoon length that leads to cancellation of horizontal excitation forces is beneficial, and that the geometrical shaping of the pontoon can be efficient to decrease the bridge response.

Copyright (c) 2018 by ASME
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