Abstract: In order to further investigate the ultimate load-bearing behavior of hull plates, the ultimate strength of hull plates under the combined action of longitudinal cyclic loading and lateral pressure was studied. The non-linear finite element numerical simulation was carried out by ABAQUS software and the effect of different lateral pressures on the ultimate strength of hull plates under longitudinal cyclic loading was analyzed. Meanwhile, different plate flexibility coefficients, the welding residual stress in the process of welding and the Bauschinger effect of steel under reverse loading were also considered. The research results show that the welding residual stress significantly affects the ultimate strength and plastic yield distribution of the hull plate at the first ultimate state under the combined action of lateral pressure and longitudinal cyclic loading. After five cycles of compression-tension, the residual ultimate strength of the hull plates considering only the initial deflection defect decreases by 23.77%~39.58%, while that considering intact initial imperfections decreases by 21.82% ~36.17%. It is indicated that the influence of welding residual stress on the ultimate strength of hull plates is weakened by lateral pressure. The smaller the plate flexibility coefficient is, the less impact the elevation of lateral pressure has on the ultimate strength of hull plates at the first compression.

Key words: ship engineering; cyclic loading; ultimate strength; hull plates; lateral pressure; welding residual stress

摘要： 为了深入分析船体板在复杂荷载条件下的极限承载性能，对船体板在纵向循环载荷和侧压组合作用下的极限强度进行了研究。利用ABAQUS软件进行非线性有限元数值模拟，分析了不同水平侧压对纵向循环载荷作用下船体板极限强度的影响；同时考虑了不同板柔度系数、焊接加工过程产生的焊接残余应力，以及反向加载时钢材的鲍辛格效应。研究结果表明：焊接残余应力对船体板在侧压和纵向循环载荷组合作用下第一次极限状态时的极限强度及塑性屈服分布有显著影响；经过5次循环压缩-拉伸后，仅考虑初始挠度缺陷的船体板剩余极限强度下降了23.77%~39.58%，而考虑完整初始缺陷的船体板剩余极限强度下降了21.82%~36.17%，这表明侧压会削弱焊接残余应力对船体板极限强度的影响；板柔度系数越小，侧压水平的升高对第一次压缩时船体板极限强度的影响越小。

关键词: 船舶工程；循环载荷；极限强度；船体板；侧压；焊接残余应力