연안교량에 작용하는 지진해일파력에 관한 수치시뮬레이션(단파의 경우)
Numerical Simulation of Tsunami Force Acting on Onshore Bridge (for Tsunami Bore)
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초록
본 연구에서는 단파와 연안교량과의 상호작용해석에 수치해석적인 방법을 이용하며, 이 때 단파는 상·하류측의 수위차로부터 조파된다. 수치해석법에는 Navier-Stokes solver에 기초한 3차원혼상류해석법인 TWOPM-3D 를 적용하며, 작용파력의 타당성은 본 수치해석결과와 기존의 실험결과와의 비교·분석으로부터 검증된다. 이로부터교량의 종류, 단파강도, 수심 및 거더 수 등에 따른 수위변화와 유속변화를 포함하여 수평파력과 연직파력(연직상방파력과 연직하방파력)의 변동특성을 면밀히 검토하였으며, 흐름에 의해 유체 중에 연행되는 공기가 연직파력에 큰 영향을 미치는 것 등을 알 수 있었다.
Abstract
In the present work, the interaction analysis between tsunami bore and onshore bridge is approached by a numerical method, where the tsunami bore is generated by difference of upstream side and downstream side water levels. Numerical simulation in this paper was carried out by TWOPM-3D(three-dimensional one-field model for immiscible two-phase flows), which is based on Navier-Stokes solver. In order to verify the applicability of force acting on an onshore bridge, numerical results and experimental results were compared and analyzed. From this, we discussed the characteristics of horizontal force and vertical force(uplift force and downward force) changes including water level and velocity change due to the tsunami bore strength, water depth, onshore bridge form and number of girder. Furthermore, It was revealed that the entrained air in the fluid flow highly affected the vertical force.
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