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| An Analytic Calculation of Dynamic Response for a Submerged Floating Tunnel Subjected to Wave and Current |
| MAI Ji-ting, LUO Zhong-xian, GUAN Bao-shu |
| Southwest Jiao Tong University, Chengdu, Sichuan 610031, China |
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Abstract Research purposes: The submerged floating tunnel (SFT) is an innovative submarine tunnel. As a result of being situated in the natural environment with wave and current actions throughout it is inevitable in designing the project to consider the dynamic response of an SF"T under the natural condition. On the other hand, the process of analyzing the interaction of an SFT with the wave and current is so complicated that it is necessary to look for a simplified and practical calculating method to meet the dynamic response.
Research methods: In this paper, a free span of an SFT body is simplified as a simple beam. On considering the conditions of the non-linear fluid damping and the structure viscous damping, the dynamic response for an SFT subjected to wave and current is analyzed by virtue of the bending vibration function on simple beam and by means of the Galerkin method and numerical integration.
Research results: The results of analyzing calculation show that the influence of the first-order modality on displacement response is the most active, and that the first-order modal response oscillation of tunnel body increases markedly as the wave frequency equals the first-order natural frequency of tunnel and harmonic vibration takes place.
Research conclusions: The dynamic response of tunnel is influenced obviously by the shape of tunnel section, the length of supporting span, and the depth of tunnel under water surface.
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Received: 10 February 2006
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2006, Vol. 23 
