【摘要】 通过建立有限元模型对海底管道的真实工况进行数值模拟,计算准静态条件下的管道压溃压力以及屈曲传播压力,并与管道全尺寸试验结果以及DNV-OS-F101规范中的计算结果进行对比,验证模型的准确性;在有限元模型中利用数据传递的方法将准静态条件下管道局部压溃的受力状态传递到动态模型中,并对管道在动态条件下的变形特点进行探究;研究管道腐蚀深度、初始椭圆度以及加载的传播压力对屈曲剖面长度、屈曲传播速度和反向椭圆度等管道动态屈曲传播特征值的影响。研究结果表明:在加载压力较小时,管道屈曲剖面长度随压力增大而减小;管道屈曲传播速度随着压力和初始缺陷的增大而加快;管道反向椭圆度的出现会阻碍屈曲沿管道轴线的传播,管道反向椭圆度随压力增大而增大。更多还原

【Abstract】 A finite element model was used to simulate the subsea pipelines in practical engineering. The results of collapse pressure and propagation pressure were compared with those of full-scale collapse test and the calculation results of DNV-OS-F101 specification, and the accuracy of the model was verified. A method called data transfer in the finite element simulation was used to transfer the quasi-static stress state of the collapsed pipeline to the dynamic model. In this way, the deformation characteristics of the pipeline under the dynamic condition was studied. Besides, the influences of corrosion depth, ovality and the external pressure on dynamic characteristic values of pipeline such as the length of buckle profile, the buckle velocity and the reverse ovality were researched. The results show that the length of buckle profile of pipeline decreases with the increase of loading pressure at low pressure. The buckle velocity of pipeline increases with the increase of pressure and the initial imperfection. The appearance of reverse ovality of pipeline will hinder the propagation of buckling along the pipeline axis, and the pipeline reverse ovality increases with the increase of pressure.更多还原