Currently, approximately 7 000 offshore platforms are utilized globally for marine energy exploration and production, with about 93% being fixed jacket platforms constructed by welding tubular components. Due to environmental corrosion, fatigue effects, and accumulated damage, various defects and damages are present in the structures of these marine platforms. To prevent these defects and damages from causing structural failures, a novel structural damage identification framework was proposed. This framework was established based on physical models, finite element models, testing models, and damage models, with the objectives of creating precise testing models, benchmark finite element models, and accurate damage models. Optimization theory for sensor placement was applied, objective optimization methods for minimizing frequency response function residuals and correlation coefficients were investigated, and a damage identification method was proposed based on frequency response and parameter uncertainty model updating. These approaches systematically achieved the goal of accurate damage identification in offshore jacket platform structures under the proposed framework. Finally, through a practical application case, both single and multiple damage instances in the jacket platform were accurately identified, demonstrating the reliability and applicability of the technology.
YAN Tian-hong, QIAN Gui-song, ZHOU Guo-qiang, DONG Hao-xuan, BAI Kang-kang.
Structural Damage of Offshore Jacket Platforms Based on Damage Identification Framework[J].
Science Technology and Engineering, 2026, 26(11): 4635-4643 DOI:10.12404/j.issn.1671-1815.2503904
模型修正法[14]通过实测平台结构振动数据来修正以图纸建模的设计参数,实现修正后有限元模型的计算振动数据与实测振动数据基本一致,而修正后模型设计参数的变化可识别结构的损伤。Farhad等[15]提出了基于实测不完全模态数据的海上导管架结构有限元修正方法。本文中通过某导管架实测振动数据与有限元模型拟合,应用模型修正技术实现修正后的模型能更准确地反映在役导管架结构动态行为。黄岩等[16]提出了一种基于主成分分析和支持向量机的井架钢结构损伤识别方法,通过缩尺模型实验验证该方法识别的准确率较高。王二成等[17]提出inception-BiLSTM(bi-directional long short-term memory)和迁移学习结合的结构损伤识别,通过钢框架结构实验,验证了该方法的实用性。Guo等[18]提出了一种基于神经网络的海洋导管架平台结构损伤识别方法,经实例计算表明,当受损构件靠近水面时,损伤识别的误差在8%以下。Ali等[19]基于实验数据采用改进CMCM(cross-model cross-mode)的有限元模型修正方法对海洋平台进行损伤检测,计算表明该方法在识别损伤位置及程度方面较传统的具有更高的精度。Shahriar等[20]提出一种基于加速度响应的灵敏度有限元模型修正新型损伤识别方法,该方法考虑了测试与建模的误差,以及测试响应的不完整性。闫天红等[21]提出基于混合模型修正的方法建立被测结构的基准模型,通过仿真分析,评估结构实际承载能力。
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