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| Analysis of the Influencing Factors ofVortex-induced Vibration Response of the Submerged Floating Tunnel Supported by Tension Leg |
| QIN Y in-gang, ZHOU X iao-jun |
| Southwest JiaotongUniversity, Chengdu, Sichuan 610031, China |
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Abstract Research purposes:This paper studies the effectofproperty change of tension leg structure on the dynamic response of submerged floating tunnelwith the followingmethods: It is to simplify the multi-span submerged floating tunnel into the concentratedmasswhich acts at the end of the anchor cable, supposing the submerged floating tunnelhas a little amplitude dynamic vibration formeeting the need of usage comfortableness. When the effect of the vortex-induced vibration of tension leg on submerged floating tunnel structure is not taken into accoun,t the equation for submerged floating tunnel vibration is established under the effect of cross current vortex-induced vibration and the slope tension leg is equalized into horizontal tension leg and vertical tension leg. If it only considers the submerged floating tunnelvibration crosses the currentand the load acts atthe anchorcable, it is to simplify the fluid force into tune load. UsingRunge-Kutta numericalmethod solves the vibration equation and the different cases are simulated with MATLAB program.
Research conclusions:The study result shows that the angle between the anchor cable and the bottom of the ocean has little effecton the dynamic response, and the response law of the tension legs' axis stiff is the same as initial tension.
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Received: 04 July 2008
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2009, Vol. 26 
