1. 上海交通大学 海洋工程国家重点实验室, 上海 200240； 2. 上海交通大学 高新船舶与深海开发装备协同创新中心， 上海 200240；3. 中国舰船研究设计中心， 武汉 430064
发布日期:2020-01-06通讯作者:薛鸿祥，男，副教授，博士生导师，电话（Tel.）:021-34204470; E-mail: hongxiangxue@sjtu.edu.cn.作者简介:张黎明（1993-），女，湖北省麻城市人，硕士生，主要研究方向为船舶结构力学.基金资助:上海市青年科技启明星计划 (16QA1402300)The Analysis of Ultimate Strength of Stiffened Panels Exposed to Fire Under Temperature Increase Condition
ZHANG Liming 1,2,LI Yuanyuan 3,XUE Hongxiang 1,2,TANG Wenyong 1,21. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China; 3. China Ship Development and Design Center, Wuhan 430064, China
Published:2020-01-06摘要/Abstract
摘要： 考虑材料在不同温度下的热力学性能变化，结合热弹塑性有限元与弧长法，研究加筋板在不同受热模式下的高温失效特性以及单轴压缩剩余极限强度.数值分析结果表明：迎筋面受热模式较背筋面受热模式升温更快，更为危险；背筋面受热模式下，结构易发生梁柱型失效；迎筋面受热模式下，结构失效表现为整体屈曲和筋的侧倾两种失效模式的叠加；当升温时间为140s时，背筋面受热和迎筋面受热模式下的结构单轴压缩剩余极限强度分别衰减至常温的13%和5%.
关键词: 加筋板； 热弹塑性有限元； 弧长法； 失效模式； 剩余极限承载能力
Abstract: Considering the thermodynamic properties of materials at different temperatures, the method of thermal-elastic-plastic finite element analysis and riks method are used to study the collapse mode and residual ultimate strength of stiffened panel exposed to fire. The residual ultimate strength of the uniaxial compression at different heating-up time is also calculated. The numerical results show that：the whole structure heats up faster and fails earlier when stiffener heated, which is more dangerous. The collapse mode is beam-column type collapse when plate heated. And the collapse mode is a combine of overall collapse mode and local buckling mode of stiffener web when stiffener heated. The ultimate strength of plate heated stiffened panel reduces to 13% of that in normal temperature and the ultimate strength of stiffener heated stiffened panel reduces to 5% when the heating time reaches 140s.
Key words: stiffened panel; thermal-elastic-plastic finite element analysis; riks method; collapse mode; residual ultimate strength
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