浮筒式拦截系统被船撞的动态响应分析

Dynamic response analysis of pontoon interception system under ship collision

根据桥梁基本情况及防船撞等级要求,设计了由浮筒、锚链、锚碇、缆索组成的浮筒式拦截系统.建立了浮筒拦截系统和船舶有限元模型,并模拟了船舶撞击拦截系统的动态过程.采用流固耦合方法考虑碰撞过程中流场的作用,分析了不同船舶质量、速度、撞击点、锚碇数量等因素对拦截效果的影响.结果表明:针对不同船舶吨数及碰撞速度,所设计的拦截系统均可以有效阻拦船舶,从而保护桥梁.当船舶吨数从5 kt增加大10 kt,动能翻倍时,拦截网和锚链的最大张力的变化均小于30%,说明该拦截系统有较大的适用性.采用双锚碇式拦截系统的拦截时间、船舶和锚碇的位移均小得多,拦截效果更好,并且锚链和拦截网拉力增加不大.

According to the basic situation of the bridge and the requirement of anti-ship collision level,a pontoon interception system consisting of floats,anchor chains,anchor anchors and cables was designed.A finite element model of the pontoon interception system and the ship was established,and the dynamic process of the ship hitting the interception system was simulated.A fluid-structure coupling method was used to consider the role of the flow field in the collision process,and the effects of different ship masses,velocities,impact points,and the number of anchorages on the interception effect were analyzed.Result shows that the designed interception system can effectively stop the ship for different tonnage and collision speeds to protect the bridge.When the tonnage of the ship increases from 5 kt to double the kinetic energy of 10 kt,the change of the maximum tension of the interceptor net and the anchor chain is less than 30%,which indicates that the interceptor system has a greater applicability.Interception time,vessel and anchor displacement are all much smaller with a double-anchored interception system,and the interception effect is better,while the anchor chain and the interception net axial force increase is not big.