基于ANSYS/LS-DYNA的海底管道受抛锚撞击动力学仿真

摘要

基于ANSYS/LS-DYNA动力学分析方法,对海底悬空管道受抛锚撞击过程进行了数值仿真.采用非线性弹簧模拟管-土之间的耦合作用,应用弹塑性碰撞理论求解了海底管道悬跨段受锚击部位的等效应力、应变时间历程,同时探讨了锚击速度、混凝土保护层对管道最大等效应力的影响.%ANSYS/LS-DYNA dynamic analysis method is introduced to simulate the nonlinear process of submarine pipeline impacted by an anchor. Nonlinear spring is presented to substitute the interaction of pipeline and seabed. The time history about equivalent stress and strain of the impacted elements of pipeline span is computed using elastic and plastic impact theory. At the same time, the effect of anchoring velocity, concrete protective layer on maximum stress of pipeline span are discussed.