【摘要】 海底悬跨管道的地震响应与地震动输入方向有关。基于Morison方程,提出了考虑地震不同输入方向的海底悬跨管道的动水作用力模型,并推导了有限元离散方程。建立三维有限元模型模拟模型试验工况,进行了正弦波和ElCentro模拟地震波输入下海底管道的动力分析。考虑地震动输入方向的Morison动水作用力模型计算海底悬跨管道动力反应的数值结果与模型试验结果符合得较好。更多还原

【Abstract】 The seismic response of free spanning submarine pipelines is related to the earthquake input directions. A hydrodynamic force model improved from Morison equation considering excitation directions to analyze the dynamic response of free spanning submarine pipelines under earthquakes is proposed. Motion equations are derived from improved Morison equation on the base of finite element method. Three dimensional FE model is established to simulate the experimental conditions. The numerical results considering sine wave input and simulated El Centro earthquake input are obtained. The comparison of numerical results with experimental results shows that the improved Morison hydrodynamic force model considering excitation directions could satisfactorily predict the dynamic response of free spanning submarine pipelines subjected to earthquakes.更多还原