Dynamic Response And Fluid Structure
Interaction Of Submerged Floating Tunnels
Author(s)
S. Remseth, B. J. Leira, A. Rönnquist & G. Udahl
Abstract
Stochastic dynamic response analyses are applied to study the behaviour of
submerged floating tunnels subjected to wave loading. The earthquake response
of a submerged tunnel with a tether mooring is studied by finite element
modelling of the bridge and surrounding fluid. The numerical examples with
wave loading emphasize effects of wave direction and shortcrestedness. The
focus is on the need for integrated versus simplified modelling in earthquake
response analysis.
Keywords: submerged floating tunnels, stochastic dynamic analysis, wave load
modelling, wave directionality, time domain earthquake analysis, finite element
modelling, dynamic fluid structure interaction.
1 Introduction
The submerged floating tunnel in Fig 1 is proposed to cross a Norwegian fjord
with a maximum depth of 150 meters and a crossing distance of 1500 meters.
The position of the tunnel relative to the surface is in this concept defined by
mooring with tethers to the bottom at four positions along the bridge.
Alternatively the tunnel can be kept in position by a combination of mooring
lines and pontoons or with pontoons only. The most feasible alternative will
depend on the site conditions such as span length, water depth, bottom
conditions, ship traffic, environmental loading (waves, current, earthquake) etc.
A submerged floating tunnel can be an alternative crossing both to rock
tunnels below the sea bottom and to long span bridges above the surface.
Keywords
submerged floating tunnels, stochastic dynamic analysis, wave load
modelling, wave directionality, time domain earthquake analysis, finite element
modelling, dynamic fluid structure interaction.
Related Book
Other papers in this volume
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