船舶撞击荷载下桩基-重力式复合结构连接节点响应分析

Response analysis of connection joint of pile-gravity composite structure under ship impact load

桩基-重力式复合结构的连接节点处受力集中、应力大,且两种材料之间的连接,是该结构最关键和薄弱的部位。利用ABAQUS软件建立桩基-重力式靠船墩模型,分析连接节点在船舶撞击荷载下的响应,并研究不同因素的影响。结果表明,在船舶靠泊撞击荷载下,桩基-重力式复合结构前排连接节点的位移和受拉损伤系数峰值略大于后两排,最大主应力峰值出现在前排桩与沉箱连接节点前侧。桩的埋入深度应不小于1倍桩径,当埋入深度超过1倍桩径后,增大埋入深度对改善连接节点受力特性效果不明显;增大桩径尺寸是改善连接节点的受力特性最有效的措施,提高沉箱高度是改善连接节点的受力特性较为经济合理的措施。同时,可设置构造措施提高连接节点的承载力。

The connection joint of pile-gravity composite structure is the place where the force is concentrated and the stress is large.The connection between the two materials is involved,which is the most critical and weak position of the structure.We use the ABAQUS finite element software to build the model of pile-gravity berthing dolphin,analyze the dynamic response of connection joint under impact load,and study the influence of different factors.The results show that the displacement and the peak value of tensile damage coefficient of the front row connecting joint of pile-gravity composite structure are greater than the latter two rows under the load of ship berthing.The maximum principal stress peak appears at the front of the joint of the front pile and the caisson.The buried depth of the pile should not be less than the pile diameter,and the effect of increasing the pile embedding depth on the stress characteristics of connecting joint is not obvious.Increasing the diameter of the pile is the most effective measure to improve the force characteristics of the joint.Increasing the caisson height is the most economical and reasonable to improve the force characteristics of the connecting joint.And the connection node with the structural measures can increase the force.