Evaluation of damage to offshore platform structures due to collision of large barge
Evaluation of damage to offshore platform structures due to collision of large barge
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DOI：
10.1016/j.engstruct.2005.02.010
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发表时间：
2005-08
影响因子：
5.5
通讯作者：
W. Jin;Jian Song;S. Gong;Yong Lu
中科院分区：
文献类型：
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作者：
W. Jin;Jian Song;S. Gong;Yong Lu
南海海上导管架平台在安装过程中受到大型井架和铺设驳船的冲击。本文提出了一种非线性动力学分析方法，首先根据损伤构件的证据确定冲击作用，然后对平台结构的整体损伤效果进行评估。采用三角形冲击载荷，模拟了不同碰撞接触次数下驳船的冲击作用。利用估算的撞击速度，模拟了不同接触时间下损伤构件压痕变形的曲线。根据这些曲线和实际检测到的凹痕损伤，确定了接触时间和平台上的最大冲击载荷。考虑到受损交叉斜撑局部压痕的力-挠度关系，采用非线性弹簧模拟了冲击载荷对平台结构的传递。平台结构非线性动力响应计算模型考虑了附加质量系数和水动力效应以及桩-土-结构相互作用。随后，计算了海上导管架结构的动力响应，得到了管状节点的临界应力和临界变形，作为损伤效应的指标。研究结果可为受损平台选择合理可行的修复加固方案提供参考。本文提出的方法一般适用于典型海上平台结构在冲击或碰撞情况下的评估。
An offshore jacket platform in the South China Sea was impacted by a large derrick and lay barge during installation. This paper presents a non-linear dynamical analysis procedure for firstly determining the impact action based on the forensic evidence from the damaged components, and then evaluating the overall damage effects on the platform structure. The impact action of the barge is simulated with a triangle impulse load with different collision contact times. The curves relating the indentation deformations of the damaged member with different collision contact times are simulated using an estimated velocity of the impacting ship. On the basis of these curves and the actual detected dent damages, the contact time and the maximum impact load on the platform are determined. Taking into account the force–deflection relationship of the local indentation of the damaged cross-diagonal brace, the transmission of the impact load to the platform structure is simulated by a non-linear spring. The added mass coefficient with hydrodynamic effects and the pile–soil-structure interaction are considered in the computational model of the non-linear dynamic response of the platform structure. Subsequently, the dynamic response of the offshore jacket structure is computed and the critical stress and deformation of the tubular joints are obtained as indicators of the damage effects. The results are useful for choosing a feasible and reasonable repairing and strengthening scheme for the damaged platform. The procedure presented in this paper is generally applicable for the evaluation of typical offshore platform structures in the case of impact or collision.