Dynamic Behavior of Submerged Floating Tunnel by Underwater Explosion
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In this paper, to estimate the dynamic behavior of a submerged floating tunnel(SFT) by underwater explosion(UE), the SFT ismodeled and analyzed by the explicit structural analysis package LS-DYNA. The section of SFT near to explosion point is modeledto shell and solid elements using elasto-plasticity material model for concrete tubular section and steel lining. And the other parts ofthe SFT are modeled to elastic beam elements. Also, mooring lines are modeled as tension-only cable elements. Total mass of SFTis including an added mass by hydrodynamic effect. The buoyancy on the SFT is considered in its initial condition using a dynamicrelaxation method. The accuracy and the feasibility of the analysis model aree verified by the results of series of free field analysisfor UE. And buoyancy ratio(B/W) of SFT, the distance between SFT and an explosion point and the arrangement of mooring linearee considered as main parameters of the explosion analysis. As results of the explosion analysis, the dynamic responses such asthe dent deformation by the shock pressure are responded less as more distance between SFT and an explosion point. However, themooring angle of the diagonal mooring system can not affect the responses such as the horizontal displacement of SFT by the shockpressure.
Abstract
In this paper, to estimate the dynamic behavior of a submerged floating tunnel(SFT) by underwater explosion(UE), the SFT ismodeled and analyzed by the explicit structural analysis package LS-DYNA. The section of SFT near to explosion point is modeledto shell and solid elements using elasto-plasticity material model for concrete tubular section and steel lining. And the other parts ofthe SFT are modeled to elastic beam elements. Also, mooring lines are modeled as tension-only cable elements. Total mass of SFTis including an added mass by hydrodynamic effect. The buoyancy on the SFT is considered in its initial condition using a dynamicrelaxation method. The accuracy and the feasibility of the analysis model aree verified by the results of series of free field analysisfor UE. And buoyancy ratio(B/W) of SFT, the distance between SFT and an explosion point and the arrangement of mooring linearee considered as main parameters of the explosion analysis. As results of the explosion analysis, the dynamic responses such asthe dent deformation by the shock pressure are responded less as more distance between SFT and an explosion point. However, themooring angle of the diagonal mooring system can not affect the responses such as the horizontal displacement of SFT by the shockpressure.
참고문헌 (12)
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