摘要
共同规范通过控制板格中心塑性变形,建立了AC-S和AC-SD工况的失效衡准,给出了考虑总纵应力影响的板格局部强度校核公式。但规范背景文件没有提供校核公式中许用应力折减系数的推导过程,分析对象仅限于油船和散货船的典型板架结构,对其他船型适用性有待探讨。本文采用非线性有限元方法,计算板格中心在总纵面内应力和侧向压力联合作用下的塑性变形,分析了折减系数的拟合方法,拟合得到的折减曲线与共同规范校核公式的折减曲线对比验证,变化趋势吻合良好。再考虑基本尺寸和材料的差异性,针对舰船上典型高强度、小间距的薄板结构形式进行了总纵应力折减方法研究,可以为舰船纵骨架式的板格局部强度评估提供参考。
Through control of the panel center plastic deformation,CSR-H sets up failure criteria for AC-S and AC-SD conditions,and provides prescriptive evaluation formulas for stiffened panels which may consider the influence of longitudinal global stress.Within technical background,CSR-H did not provide derivation process of these factors,and the targets were mainly thick panels of oil tankers and bulk carriers.In this paper,plastic deformation is calculated under different combinations of in-plane stress and uniform pressure.Reduction factors are fitted,compared and verified by formulas of CSR-H,and its trend is in good agreement.Considering the significant deviation of material and scantlings,a group of standard stiffened panels on naval ship are evaluated.A new reduction curve is fitted and recommended.
作者
曲雪
邹路遥
朱青淳
王福花
QU Xue;ZOU Lu-yao;ZHU Qing-chun;WANG Fu-hua(The 708 Research Institute of CSSC,Shanghai 200011,China)
出处
《舰船科学技术》
北大核心
2024年第7期27-30,共4页
Ship Science and Technology
关键词
规范校核
板格局部强度
总纵应力
许用应力折减系数
rule requirements
local strength of panels
longitudinal stress
reduction factor of permissible stress
