船体梁在循环载荷下的极限强度研究
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摘要
在船体极限强度的研究中,对船体到达极限强度后的剩余承载能力的研究非常重要,其关系到船体结构的生命力设计,用于判断船舶破损情况下是否还能保持一定的自存能力,制定救援方案以及作为船舶在极端情况下安全性的判断依据。目前此类研究多是针对单次加载,而在实际海洋环境中,船舶会受到交变载荷的作用,如果超过弹性范围,会留下塑性应变,这些残留应变会影响船舶最终承载能力的大小。本文以逐步崩溃法为基础,用Fortran语言开发了计算程序,该程序可以得到船体梁在极限强度后的承载能力,同时通过递增塑性法来模拟循环加载带来的影响,并采用非线性有限元法进行对比验证。
After imposing the longitudinal ultimate strength, the capacity of ship will be changed due to obviously nonlinear deformation. At present, the residual capacity of ship is very concerned in the study of hull girder strength. And the residual strength will be changed strongly under cyclic loading. In this paper, the nonlinear FEM calculations under cyclic loading of box beams and some real ships have been carried out by Abaqus respectively, to obtain moment-curvature curves, and based on the analysis of the incremental plastic method and the progressive collapse method, a calculation program have been developed, it can analysis the residual carrying capacity of hull girder under cyclic bending loads, then compare it to the FEM calculations' results.
After imposing the longitudinal ultimate strength, the capacity of ship will be changed due to obviously nonlinear deformation. At present, the residual capacity of ship is very concerned in the study of hull girder strength. And the residual strength will be changed strongly under cyclic loading. In this paper, the nonlinear FEM calculations under cyclic loading of box beams and some real ships have been carried out by Abaqus respectively, to obtain moment-curvature curves, and based on the analysis of the incremental plastic method and the progressive collapse method, a calculation program have been developed, it can analysis the residual carrying capacity of hull girder under cyclic bending loads, then compare it to the FEM calculations' results.
引文
[1]PAIK J K,PEDERSEN P T.A simplified method for predicting ultimate compression strength of ship panels[J].Int.Shipbuild.Progr.,1996,43(434):139-157.
[2]YAO T,et al.Post-ultimate strength behavior of long rectangular plate subjected to uni-axial thrust[R].Stavanger,Norway:International Society of offshore and Polar Engineers,2001.
[3]XU W,IIJIMA K,FUJIKUBO M.Parametric dependencies of post-ultimate strength behavior of a ship’s hull girder in waves[J].Journal of Marine Science and Technology,2012,17(2):203-215.
[4]YAO T,NIKOLOV P I.Buckling/Plastic Collapse of Plates under Cyclic Loading[J].Journal of The Society of Naval Architects of Japan,1990,168:449-462.
[5]PLAMEN Ivanov Nikolov,Progressive collapse analysis of a ship’s hull under longitudinal bending[D].1992(6).
[6]UEDA Y.Advances in the application of ISUM to marine structures[J].Advances in Marine Structure,1991:628-649P.
[7]RAHMAN M K,CHOWDHURY M.Estimation of ultimate longitudinal bending moment of ships and box girders[J].Journal of Ship Research,1996,40(3):244-257.
[8]李辉程.基于递增塑性法的船体极限强度研究[D].哈尔滨:哈尔滨工程大学,2009.
[9]黄震球,陈齐树,骆子夜.循环弯曲载荷下船体梁的极限总强度[J].中国造船,1996(3):87-95.
[10]喻霁.循环弯曲作用下船体梁逐步崩溃行为的研究[D].武汉:武汉理工大学,2013.
[2]YAO T,et al.Post-ultimate strength behavior of long rectangular plate subjected to uni-axial thrust[R].Stavanger,Norway:International Society of offshore and Polar Engineers,2001.
[3]XU W,IIJIMA K,FUJIKUBO M.Parametric dependencies of post-ultimate strength behavior of a ship’s hull girder in waves[J].Journal of Marine Science and Technology,2012,17(2):203-215.
[4]YAO T,NIKOLOV P I.Buckling/Plastic Collapse of Plates under Cyclic Loading[J].Journal of The Society of Naval Architects of Japan,1990,168:449-462.
[5]PLAMEN Ivanov Nikolov,Progressive collapse analysis of a ship’s hull under longitudinal bending[D].1992(6).
[6]UEDA Y.Advances in the application of ISUM to marine structures[J].Advances in Marine Structure,1991:628-649P.
[7]RAHMAN M K,CHOWDHURY M.Estimation of ultimate longitudinal bending moment of ships and box girders[J].Journal of Ship Research,1996,40(3):244-257.
[8]李辉程.基于递增塑性法的船体极限强度研究[D].哈尔滨:哈尔滨工程大学,2009.
[9]黄震球,陈齐树,骆子夜.循环弯曲载荷下船体梁的极限总强度[J].中国造船,1996(3):87-95.
[10]喻霁.循环弯曲作用下船体梁逐步崩溃行为的研究[D].武汉:武汉理工大学,2013.