船体箱型梁极限强度的有限元计算方法应用广泛，但其计算方法具有一定的不稳定性。本文开展对箱型梁简化模型的极限强度研究，基于非线性有限元法计算3种典型箱型梁模型的极限强度，与已有实验数据比对，验证本文有限元算法的可靠性。通过分析箱型梁边界条件类型、网格密度大小和初始缺陷等敏感因素，发现边界条件未设置延长段的模型计算误差达到了20%，粗糙网格计算误差达到了30%，初始缺陷大小为0.01～0.02倍箱型梁跨长时，计算结果敏感性较小。
Finite element(FE)method for ultimate strength of hull box girder is widely used, but the FE method has a certain degree of instability. This paper develops the ultimate strength study of the simplified model of box girder, calculate the ultimate strength of three typical box girder models based on nonlinear FE method, Comparing with existing experimental data, verify the reliability of the FE method. Analyze the sensitive factors such as the boundary condition type, grid density and initial defects of box girder, analyze the sensitive factors such as the boundary condition type, grid density and initial defects of box girder, found that the model calculation error without extended section reached 20%, rough grid calculation error reaches 30%, when the initial defect size is 0.01 to 0.02 times of the length of the box girder, the calculation has less sensitive.
2019,41(8): 28-33,54 收稿日期：2019-03-15
DOI：10.3404/j.issn.1672-7649.2019.08.006
分类号：U661.43
基金项目：山东省船舶控制工程与智能系统工程技术研究中心科研开放专项资金资助项目（SSCC-2018-0004）
作者简介：王保森(1991-),男,硕士,主要从事船舶结构强度及性能研究
参考文献：
[1] NISHIHARA S. Analysis of ultimate strength of stiffened rectangular plate (4th report) on the ultimate bending moment of ship hull girders[J]. Journal of the Society of Naval Architects of Japan, 1983, 154:367-375
[2] NISHIHARA S. Ultimate longitudinal strength of midship cross section[J]. Naval Arch. Ocean Eng, 1984, 22:200-214
[3] DOWLING P J, MOOLANI F M, FRIEZ PA. The effect of shear lag on the ultimate Strength of box girder[C]//Proc. Int. Con. On Steel Plated Structures. London, 1976:108~147.
[4] REKLING K A. Behaviour of box girder under bending and shear[A]. proc. ISSC[C], Paris 1997. Ⅱ. 2.46-11.2.49
[5] HANSEN A M. Strength of midship section[J]. Marine Structures, 1996, 9:471-494P
[6] GORDO J M, SOARES C G, FAULKNER D. Approximate assessment of the ultimate longitudinal Strength of the hull girder[J]. Ship Research, 1996, 40(1):60-59
[7] 徐向东, 崔维成, 冷建兴等. 箱型梁极限承载能力试验与现论研究[J]. 船舶力学. 2000, 4(5):36~43
[8] 白勇, 徐向东, 崔维成. 船体结构极限强度的影响参数与敏感度探讨[J]. 船舶力学, 1998, 4(5):35-43
[9] 贺双元, 吴卫国, 陆浩华, 运用MARC进行箱梁的极限强度分析[J]. 武汉理工大学学报(交通科学与工程版), 2006. 30(5):889~891
