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Study on the unequivalence between stiffness loss and strength loss of damaged hull girder
Ocean Engineering ( IF 5 ) Pub Date : 2021-04-16 , DOI: 10.1016/j.oceaneng.2021.108986
Yin Zhang , Jun Guo , Jiang Xu , Shun Li , Junjie Yang

Hull girder damage degree identification by dynamic parameter change mainly solves the stiffness loss, while ship safety assessment mainly aims at strength loss issues. In this paper, a novel method is proposed to calculate strength loss based on stiffness loss. Section modulus is taken as the strength index to reveal that the stiffness loss of hull girder after damage is not always equivalent to its strength loss, and the theory for unequivalence between stiffness loss and strength loss (UNSS) is validated by 13 common cross sections. A simplified hull section is taken as the research object to verify the theory by different damage cases. Finally, the strength loss correction formulas based on stiffness loss under different damage conditions are summarized by the proportional relationship derived from neutral axis shift and stiffness loss. Results show that the shift of neutral axis is the main reason for UNSS. Different damage conditions will show different UNSS characteristics. The new method concluded for calculating the strength loss of hull girder can help check the hull girder strength.



中文翻译:

受损船体梁的刚度损失与强度损失不相等的研究

通过动态参数变化识别船体大梁的损伤程度主要是解决刚度损失,而船舶安全评估主要针对强度损失问题。本文提出了一种基于刚度损失的强度损失计算方法。以截面模量作为强度指标,表明船体大梁在损伤后的刚度损失并不总是等于其强度损失,并且通过13个常见横截面验证了刚度损失与强度损失之间不等价的理论。以简化的船体截面为研究对象,对不同损伤情况下的理论进行了验证。最后,根据中性轴位移与刚度损失的比例关系,总结了基于不同损伤条件下刚度损失的强度损失修正公式。结果表明,中性轴偏移是造成UNSS的主要原因。不同的破坏条件将显示不同的UNSS特性。得出的用于计算船体梁强度损失的新方法可以帮助检查船体梁强度。

更新日期:2021-04-16
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