| 极端循环载荷下船体裂纹箱型梁的极限强度 |
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| 引用本文： | 胡康,杨平,刘清超.极端循环载荷下船体裂纹箱型梁的极限强度[J].海洋工程,2023,41(3):85-95. |
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| 作者姓名： | 胡康 杨平 刘清超 |
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| 作者单位： | 1.武汉理工大学 船海与能源动力工程学院，湖北 武汉 430063
2.武汉理工大学 高性能船舶技术教育部重点实验室，湖北 武汉 430063 |
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| 基金项目： | 国家自然科学基金资助项目（51779198） |
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| 摘 要： | 旨在了解箱型梁在极端循环载荷下的极限强度特性。利用非线性有限元方法来研究裂纹箱型梁的极限弯矩，分析了5种裂纹模型，探讨了裂纹类型、裂纹位置和裂纹长度的影响。考虑了两种载荷形式应用生死单元法对双向循环弯曲下裂纹扩展进行了模拟；并将由循环载荷引起的累积塑性损伤和疲劳裂纹损伤均考虑在内。无论单向循环还是双向循环，单裂纹模型的极限弯矩均小于双裂纹模型的极限弯矩；单边裂纹是最危险的裂纹类型。进一步分析了极端循环载荷下裂纹箱型梁的极限强度折减机理，得出了极限强度折减归因于这两种损伤的耦合作用的结论，并通过其他箱型梁验证了其适用性。
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| 关 键 词： | 循环载荷 极限强度 箱型梁 裂纹扩展 船体结构 |
| 收稿时间： | 2022/7/27 0:00:00 |
| 修稿时间： | 2023/5/31 0:00:00 |
Ultimate strength of cracked box girders under extreme cyclic loads |
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| HU Kang,YANG Ping,LIU Qingchao.Ultimate strength of cracked box girders under extreme cyclic loads[J].Ocean Engineering,2023,41(3):85-95. |
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| Authors: | HU Kang YANG Ping LIU Qingchao |
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| Abstract: | This study aims at gaining insight into the ultimate strength characteristic of box girders under extreme cyclic loads. Nonlinear finite element method was performed to investigate the ultimate bending moment of cracked box girder, and five types of cracked models were analyzed. The effects of crack type, crack location and crack length under extreme cyclic loads were discussed. Two load patterns were considered, and crack propagation under bi-directional cyclic bending was simulated by applying the dead-live element method. The accumulated plastic damage and fatigue crack damage due to cyclic loads were both considered in the study. Regardless of unidirectional or bidirectional cyclic bending, the ultimate bending moments of single-crack models were smaller than those of double-crack models, and single-edge crack was the most dangerous crack case. The mechanism of ultimate strength reduction of cracked box girder under extreme cyclic loads was further analyzed. It can be concluded that ultimate strength reduction is attributed to the coupling effect of these two damages and its applicability is verified by other box girders. |
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| Keywords: | cyclic loads ultimate strength box girders crack propagation hull structure |
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