摘要
本文采用增量有限元方法结合极限分析的概念，研究近海固定平台碰撞的静力强度。文中综合考虑了平台结构在碰撞加载过程中的大变形和塑性变形特性，建立了以广义应力表达的圆管截面的屈服条件，采用塑性节点法（ＰＮＭ）推导得到了单元的弹塑性矩阵。文中也考虑了梁柱单元的屈曲情况。本文所采用的载荷增量法结合牛顿—拉夫逊迭代，可跟踪加载过程中平台结构上塑性铰的出现，并最终获得平台结构的极限承载能力。
In this paper,a numerical analysis method combining FEM incremental technique with limit analysis concept is proposed for the study of the static strength of platform in collision. Large deformation and plasticity are accounted for and the limit yield surface expressed by generalized stress for a tubular section is derived. The modified stiffeness matrix of space beam element is formulated by plastic node method. The buckling behaviour of beam columns also can be taken into account. It can trace the generation of plastic hinges during loading and finally obtain the ultimate strength of offshore platform against collision.
出处
《海洋工程》
CSCD
北大核心
1995年第2期14-21,共8页
The Ocean Engineering
关键词
海洋平台
碰撞
极限强度
塑性节点法
Offshore platform
Collision
Ultimnte strength
plastic node method
