Tension during parametric excitation in submerged vertical taut tethers |
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| Institution: | 1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology (DUT), Dalian 116024, China;2. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Penryn Campus, Penryn, Cornwall TR10 9FE, UK;1. Coastal & Ocean Engineering Division, Korea Institute of Ocean Science and Technology, Busan, Republic of Korea;2. School of Civil, Environmental and Architectural Engineering, Korea University, Seoul, Republic of Korea;1. New Transportation System Research Center, Korea Railroad Research Institute, 176, Cheoldo bangmulgwan-ro, Uiwang-City, Gyeonggi-Do, 16105, South Korea;2. Offshore Plant Research Division, KRISO [Korea Research Institute of Ships & Ocean Engineering], 171 Jangdong, Yusong, Daejeon, 305-343, South Korea;1. National Engineering Research Center for Port Hydraulic Construction Technology, Tianjin Research Institute for Water Transport Engineering, M.O.T, Tianjin, 300456, China;2. State Key Laboratory of Ocean Engineering, Shanghai JiaoTong University, Shanghai, 200240, China;3. Key Laboratory for Damage Diagnosis of Engineering Structures of Hunan Province, College of Civil Engineering, Hunan University, Changsha, 410082, China;4. College of Civil Engineering and Architecture, Hainan University, Haikou, 570208, China |
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| Abstract: | The construction of a suspension bridge with floating pylons or a submerged floating tunnel requires the installation of a mooring system. The option of taut vertical tethers, similar to those used in tension-leg platforms, has been suggested in preliminary designs. The environmental loading on the tether, mainly due to wind waves and swell, results in a parametrically excited system. Certain loading conditions develop instabilities that translate into large horizontal motion. However, the effects of parametric resonance on the tension values have rarely been investigated. This paper aims to clarify the relation between lateral displacement and tether tension and to quantify the extreme tension values in the event of parametric resonance. The presented analysis is based on a full numerical model of the tether that includes geometric and hydrodynamic nonlinear effects. This model is used to investigate a representative example that illustrates parametric resonance and multiple parametric studies to assess the effects of the excitation frequency, amplitude, initial pretension, tether length and inclination angle on the tether’s response. The results reported here provide the basis for a recommendation on designing a tether under parametric resonance regarding the ultimate extreme values and fatigue life. |
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| Keywords: | Parametric excitation Instability Tether Tension Fatigue |
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