多跨失稳的船体梁极限强度的Smith法修正研究  

A Corrective Smith Method of Hull Girder Ultimate Strength Considering Longitudinal Multi-Span Overall Buckling

作　　者：吴剑国[1] 万琪[2] 王福花[2] 朱汉波[1] 王浩钦[1] WU Jianguo;WAN Qi;WANG Fuhua;ZHU Hanbo;WANG Haoqin(Zhejiang University of Technology,Hangzhou 310023,China;Marine Design ＆ Research Institute of China,Shanghai 200011,China)

机构地区：[1]浙江工业大学,杭州310023 [2]中国船舶与海洋工程设计研究院,上海200011

出　　处：《中国造船》2018年第2期51-61,共11页Shipbuilding of China

摘　　要：为了考虑多跨失稳对船体梁极限强度的影响和拓宽Smith法的适用范围,分别对两端弹性支持的横梁和一端弹性固定横梁支撑的纵骨,提出多跨失稳的纵骨梁柱屈曲载荷-端缩曲线的计算方法,并推导了相应的公式。采用多跨失稳理论和非线性有限元法,进行大跨度甲板板架的极限强度计算,分析纵骨截面惯性矩、纵骨间距、横梁间距、横梁跨距、横梁截面惯性矩、横梁数目、纵桁长度和扇形惯性矩等因素对纵骨多跨失稳极限载荷的影响。应用论文建议的公式和非线性有限元方法,对一艘115000 DWT单舷侧散货船进行了触底和碰撞破损后考虑多跨失稳的船体梁极限强度计算和相互比较。计算结果表明,论文建议的方法具有较高的精度。With regard to buckling of a longitudinal bone with multi-span beam column in lengthwise direction, a formula is proposed for calculating load-end contraction curve of a longitudinal bone elastically supported by beams on both ends, and on only one end respectively, which may be applied in large-span buckling and damaged hull girders. Ultimate strength of the beam column for a large-span grillage is calculated with the theoretical formula for single-span, presented method for multi-span and nonlinear finite element method（NFEM）, and they are compared with each other. Influences of several factors are analyzed, such as the section inertia, separation distance of stiffeners, separation distance of beams, and section inertia of cross girders. Ultimate strength of the hull girder of a115000 DWT carrier with a single hull bulk damaged is calculated with various methods. The results indicate that the correction method is appropriate for practical application.

关 键 词：载荷-端缩曲线 极限强度 Smith法 非线性有限元 

分 类 号：U661.43[交通运输工程—船舶及航道工程]