非均匀加筋板格极限受压强度计算建模研究

The aim of this paper is to develop computational models for the ultimate compressive strength analysis of stiffened plate panels with nonuniform thickness.Modeling welding-induced initial deformations and residual stresses was presented with the measured data.Three methods,i.e.,ANSYS finite element method,ALPS/SPINE incremental Galerkin method,and ALPS/ULSAP analytical method,were employed together with existing test database obtained from a full-scale collapse testing of steel-stiffened plate structures.Sensitivity study was conducted with varying the difference in plate thickness to define a representative(equivalent)thickness for plate panels with nonuniform thickness.Guidelines are provided for structural modeling to compute the ultimate compressive strength of plate panels with variable thickness.

Three-Dimensional Thermo-Elastic-Plastic Finite Element Method Modeling for Predicting Weld-Induced Residual Stresses and Distortions in Steel Stiffened-Plate Structures

The objective of the present paper is to develop nonlinear finite element method models for predicting the weld-induced initial deflection and residual stress of plating in steel stiffened-plate structures. For this purpose, three-dimensional thermo-elastic-plastic finite element method computations are performed with varying plate thickness and weld bead length (leg length) in welded plate panels, the latter being associated with weld heat input. The finite element models are verified by a comparison with experimental database which was obtained by the authors in separate studies with full scale measurements. It is concluded that the nonlinear finite element method models developed in the present paper are very accurate in terms of predicting the weld-induced initial imperfections of steel stiffened plate structures. Details of the numerical computations together with test database are documented.

多孔钢板在双轴受压与边缘剪力荷载共同作用下的极限强度

作为作者系列研究成果[Paik J K.Ulti-mate strength of perforated steel plates under edge shear loading.Thin-Walled Structures,2007,45:301-6,Paik J K.Ultimate strength of perforated steel plates under axial compressive loading alongshort edges.Ships Offshore Struct,2007,2(3):(in press)]的终结篇,与前期论文在边缘剪力或单轴压力荷载方面进行了对比,目的是研究双轴受压和边缘剪力作用下多孔钢板的极限强度特点,这是船舶和船舶型海洋结构在货物和水压作用下的一个典型受力模式。板的约束考虑为四边简支,中心区域为圆形孔。一系列ANSYS非线性有限元分析中考虑了不同的板尺寸(厚度)。在有限元分析基础上,推导出组合荷载下多孔板的极限强度交互关系公式,可用于可靠性分析或规范中极限强度的预测。

铝制蜂窝夹芯板的强度特性

铝夹芯结构非常适合于设计飞机、高速列车和快艇等轻型交通系统。研究目的主要是明确包含铝蜂窝状内芯的铝制夹芯板在理论和试验中的强度特性。对弯曲、轴压和侧向撞击荷载作用下的铝蜂窝夹芯板构件进行了一系列强度试验。在相应荷载作用下,运用简化理论分析蜂窝夹芯板的弯曲变形、屈曲/极限强度和破坏强度。同时也讨论了结构失效模式,并给出了试验数据。

根据IACS通用结构规程设计的油轮结构的极限状态分析

主要评价根据IACS通用结构规程(IACSCSR)方法设计的AFRAMAX级双层船壳油轮结构的极限状态(ULS),并与根据IACS前一版通用规范设计的同级/型油轮的结构设计对比。用这两种设计方法,计算对比了加劲板结构在甲板和船底、抵抗竖向弯曲的船体支架等部分的极限强度。采用ALPS/ULSAP程序对加劲板结构进行ULS评估,采用ALPS/HULL程序进行船体破坏分析。同时也采用了更为精细的ANSYS程序对结构进行非线性有限元分析。