碰撞凹陷对导管架屈曲及疲劳强度的影响

The influence of collision depression on buckling characteristics and fatigue strength of jacket

以某导管架架腿在受台风影响下与运维船发生碰撞凹陷为基础,根据碰撞产生的实际凹陷尺寸,建立导管架架腿凹陷模型,采用Ansys软件研究碰撞凹陷对圆管屈曲承载能力及疲劳强度的影响。结果表明:在轴向荷载作用下,碰撞凹陷后圆管临界屈曲承载能力降低了45.87%。在临界屈曲载荷作用下,完整圆管径向位移沿圆管径向向外鼓曲,但凹陷圆管径向位移呈现局部向内凹陷和局部向外鼓曲的现象。碰撞凹陷后,凹陷圆管疲劳损伤值局部区域呈增加的趋势,疲劳损失最大值区域发生在凹陷中间凹痕的C点和D点区域。

Basing on the jacket leg which has been collision depression under the influence of a typhoon in offshore wind part.Bulid the model of jacket leg,according to worker's field measurment which measured the length,the width and the depth of the jacket leg collision depression,aslo,considering the actual cosllision depression picture.based on the Newton-Simpson method,the impact of the collision depression on the buckling bearing capacity and fatigue strength of the circular tube was studied by using Ansys software.The results show that the critical buckling bearing capacity of the circular tube decreases by 45.87%after considering the collision depression.Under the critical buckling load,the displacement of the complete circular tube increases outward along the radial direction of the circular tube,but the local area of the displacement of the depressed circular tube is inward along the radial direction of the circular tube.After the collision depression,the fatigue damage value of the depression circular tube increases as a whole,comparing with complete circular tube,and also,the maximum fatigue damage area is transferred to the depression area in the middle of the dent.