大型船舶碰撞引起的海洋导管架平台结构损伤分析

Damage analysis of offshore jacket platform structures due to collision of large barges

主要对某一海洋导管架平台结构受到大吨位起重铺管船的碰撞进行了详细的非线性数值动力模拟。采用非线性弹簧来模拟受损构件的凹陷特性,计算分析了船舶侧向撞击导管架平台结构在不同的碰撞接触时间下的构件损伤情况,与实际结构损伤的检测结果相比较,反演计算分析了船舶以不同的速度与平台发生碰撞,得到了不同的碰撞接触时间和最大撞击力,以及导管架平台结构主要节点的应力、位移时间历程曲线,可以确定受到撞击后导管架平台结构构件和管节点的损伤程度,对提出合理可行的修理加固方案提供了理论依据。

The nonlinear dynamic elasticplastic response for some offshore jacket platforms impacted by the largetonnage Derrick & Lay Barges during the installation of steel jacket structures is investigated. The nonlinear spring is introduced for the simulation of the forcedeflection relationship of the local indentation for the damaged X diagonal brace. The added mass coefficients for the seawater dynamic effects and the pilesoilstructure interaction are considered in the analysis of the computational model. The impact action of the ship is transformed into isoceles triangle impulse load at different collision contact times. The computational results are compared with the actual damages to determine the collision contact time and maximum impact load under the velocity of the ship being presumed. The stress and displacement dynamic response curves of the tubular nodes for offshore jacket platform structures are obtained to evaluate the damage extent. The conclusions presented in this paper will benefit offshore operators in choosing feasible and reasonable repairing and strengthening schemes.