【摘要】 在不同方向的地震动输入下海底悬跨管道的动力响应存在差别.基于Wake模型,提出了三维地震输入下的海底悬跨管道的水动力模型,并推导了有限元控制方程.建立有限元离散模型模拟模型试验工况,进行了正弦波和El Centro模拟地震波输入下海底悬跨管道的动力分析.通过数值计算和模型试验的结果比较可以看出,考虑地震动输入方向影响的Wake模型能够应用于海底悬跨管道的地震响应分析,其计算结果与试验结果符合得较好.更多还原

【Abstract】 The earthquake input directions affect seismic response of free spanning submarine pipeline. A hydrodynamic force model improved from Wake model considering three dimensional excitation inputs is presented. Equations of motion are derived from the improved Wake model on the basis of finite element method. Finite element model is established to simulate the experimental conditions. The numerical results subjected to sine wave input and simulated El Centro earthquake input are obtained. The comparison of numerical and experimental results shows that the Wake model considering excitation directions could satisfactorily predict dynamic response of free spanning submarine pipelines under earthquake,and the numerical results are in agreement with the experimental ones.更多还原