The response of submerged tunnels to their environment

Brancaleoni, Fabio; Castellani, A.; D’Asdia, P.

doi:10.1016/0141-0296(89)90032-1

Cited by 36 publications

(12 citation statements)

References 2 publications

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“…The behaviour of such structures when subjected to extreme loading conditions, however, involves delicate design and computational questions (see Brancaleoni et al [1] for a review of the topic); one of these is represented by the structural response to ultimate seismic actions [2,3]. The seismic issue, in turn, shows di!erent facets which we will try to summarize, with the help of Figures 1 and 2, as follows.…”

Section: Introductionmentioning

confidence: 99%

The dynamic response of seabed anchored floating tunnels under seismic excitation

Fogazzi

Perotti

2000

Earthquake Engng. Struct. Dyn.

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SUMMARYIn this paper a procedure for analysing the seismic response of seabed anchored #oating tunnels is presented. The "rst step of the research was the development of an &ad hoc' "nite element for modelling the behaviour of anchor elements, with particular reference to the problem of transverse oscillations under time varying axial loads. The element was subsequently inserted in a step-by-step procedure for the numerical analysis of non-linear response to multiple-support seismic input; the procedure encompasses simpli"ed modelling of #uid}structure and soil}structure interaction e!ects. An example of an application is given concerning two 4680 m long #oating tunnels with di!erent seabed pro"les.

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Section: Introductionmentioning

confidence: 99%

The dynamic response of seabed anchored floating tunnels under seismic excitation

Fogazzi

Perotti

2000

Earthquake Engng. Struct. Dyn.

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“…Submerged tunnels are a promising alternative to long-span bridges for crossing sea straits, fjords or inland waters [1][2][3][4][5][6][7]. Different types of submerged tunnels have been recently proposed to overcome the problems related to the installation of traditional immersed tunnels (resting on the seabed) in intermediate-to-large depth conditions.…”

Section: Introductionmentioning

confidence: 99%

Numerical models for the dynamic response of submerged floating tunnels under seismic loading

Pilato

Feriani

Perotti

2008

Earthq Engng Struct Dyn

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Submerged Floating Tunnels are a promising alternative to bridges and underground tunnels for crossing sea straits or, in general, waterways. The dynamic behavior of SFTs involves complex design and analysis issues, mainly related to the response to environmental actions. Within this context, the modeling of tethering elements of seabed anchored floating structures is here addressed, with particular reference to the crossing of deep waters; attention is devoted to the design solution encompassing slender bars as anchor elements. Two numerical tools are proposed: first, a geometrically non-linear finite element (NWB model), developed in previous work, has been refined in order to capture the effect of higher flexural modes of anchor bars. Secondly, a 3D beam element, based on the classical corotational formulation (CR), has been developed and coded. Both elements are implemented in a numerical procedure for the dynamic time\ud domain step-by-step analysis of non-linear discretized systems; seismic loading is introduced by generating artificial time-histories of spatially variable seismic motion.\ud An example of application of the NWB element is shown regarding the behavior of the dynamic model of a submerged tunnel proposed for the Messina Strait crossing. The model was subjected to extreme multiple-support seismic loading. The behavior under seismic loading is here illustrated and commented, especially in light of the effect of higher local vibration modes of the anchor bars

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“…Most of the wave theories used for the evaluation of wave forces on offshore structures are based on three parameters, i.e., water depth, wave height and wave period. The Airy wave theory, which holds for wave heights up to 10-15 m, covers a wide range and can consider significant waves of any actual sea states [13]. As the SFT is located at locations where the significant wave height is smaller than the water depth, the Airy wave theory can be used to model the sea states.…”

Section: Modeling Of Waves and Currentsmentioning

confidence: 99%

“…However, the global performance of the SFT under complex environmental conditions is not yet well understood. The determination of stable mooring cable configurations for the SFT is one of the challenges for its realization [12,13]. Especially, the excessive lateral displacement of the SFT due to waves and currents make it questionable for safe transportation.…”

Section: Introductionmentioning

confidence: 99%

“…A formulation for the dynamic analysis of the SFT under seismic and sea waves effects was presented by [13]. A primary attempt to analyze the fluid-structure interaction (FSI) of the SFT using a two-dimensional model was made by [14], followed by a more comprehensive presentation of FSI by [15] using the finite element implementation of the Navier-Stokes equation.…”

Section: Introductionmentioning

confidence: 99%

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Performance Evaluation of Submerged Floating Tunnel Subjected to Hydrodynamic and Seismic Excitations

2017

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Submerged floating tunnels (SFTs) are innovative structural solutions to waterway crossings, such as sea-straits, fjords and lakes. As the width and depth of straits increase, the conventional structures such as cable-supported bridges, underground tunnels or immersed tunnels become uneconomical alternatives. For the realization of SFT, the structural response under extreme environmental conditions needs to be evaluated properly. This study evaluates the displacements and internal forces of SFT under hydrodynamic and three-dimensional seismic excitations to check the global performance of an SFT in order to conclude on the optimum design. The formulations incorporate modeling of ocean waves, currents and mooring cables. The SFT responses were evaluated using three different mooring cable arrangements to determine the stability of the mooring configuration, and the most promising configuration was then used for further investigations. A comparison of static, hydrodynamic and seismic response envelope curves of the SFT is provided to determine the dominant structural response. The study produces useful conclusions regarding the structural behavior of the SFT using a three-dimensional numerical model.

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The response of submerged tunnels to their environment

Cited by 36 publications

References 2 publications

The dynamic response of seabed anchored floating tunnels under seismic excitation

The dynamic response of seabed anchored floating tunnels under seismic excitation

Numerical models for the dynamic response of submerged floating tunnels under seismic loading

Performance Evaluation of Submerged Floating Tunnel Subjected to Hydrodynamic and Seismic Excitations

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