수중폭발에 의한 해중철도의 전체 응답 해석

초록

Long distance submerged floating railway must be designed to secure passengers’ safety even in case of accidental events . Underwater explosion caused by terrorists or accident is the most critical event to long submerged structures. To design a safe submerged floating railway against underwater explosion, its behavior must be investigated and clarified. In this paper, first, shock waves and impulse pressures generated by a charge away from the submerged floating railway are expressed by the formulas coming from the experimental results. Second, the submerged floating railway tethered by mooring lines and anchors is modeled as a simply supported uniform beam with continuous elastic springs. Finite element analysis for the beam model subjected to the impulse loading is conducted by using a commercial code so that the response of the submerged floating railway can be investigated. For design purpose, simplified analysis method combined with dynamic load factor is also proposed for the same model. Maximum deformation and internal forces are calculated by this method and compared with the time dependent analysis results. It is shown that the simplified analysis result gives good agreement with the time dependent analysis one.