文档介绍：Ip盟唧代号一一?一塑!!!?分类号’¨{ 学号密级 0306420118 公开帚簧它手抖镀尤警硕士学位论文题(中、英文)目随机结构的热可靠性分析?????.一功;!m÷!且叫j;, .??.??.??j地B铆1d例11_塾!!l_c蚋婴;一.....?一....一... 作者姓名王灵刚指导教师姓名、职务陈建军教授学科门类?,王一堂?学科、专业??一机械制媸及墓自动化提交论文日期????????壬99本年:且???????摘要摘要结构可靠性分析和基于可靠性的结构优化设计是现代工程结构研究领域中的重要课题。文中对随机参数梁结构在随机稳念温度场作用下的结构有限元分析、可靠性分析和基于可靠性的优化设计等问题进行了研究。,其中分别或同时考虑了结构材料的物理参数、构件的几何尺寸和温度参数等的随机性:对结构响应(温度、位移、应力)随机变量的数字特征计算表达式进行了推导。在结构可靠性分析的基础上,构建了以杆截面积为设计变量,使结构重量极小化为目标函数,同时具有应力和位移可靠性约束的优化设计数学模型。对模型中的可靠性约束进行了等价显示化处理;对结构响应进行了基于可靠性的灵敏度分析,导出了结构响应可靠性约束的灵敏度计算公式。针对本文提出的分析方法,编制了相应的程序。通过算例验证了此方法的合理性与可行性。关键词:随机结构可靠性分析灵敏度分析优化设计 ABSTRACT ABSTRACT Structuralreliability analysis and optimization are ofgreat importaIlce inmodem engineering structural research and paper mainly deals with thesubjects below: the problem on FEM analysis,辩liabiHty analysis and calcuiation, and optimization based on thereliability ofthemndom parameters stmcturc;and alsobrings forward amethod forgetting theralldom a11swers from theFEM equation bytaking the random multiplier行om arandom variable;In theFEM a11alysis andstructuralreliabiljty optimization,the randomicity ofthestructuraIphysical parameters,geometr;c d{mensjons and me loadapplied on thestmctures(under thesteady random temperature ne】d )are all p印er reasons outthereliabilityexpressions oftherandom parameters tmsscons妇inedby akindofrandom al】 on矗nite element andre“abmy analysis,the stmcturaloptimization design model based on probability isconstructed, which refers thecross-section areas as me design variables,refers theminimum ofthe frame’sweight ast11eobject withthereliabiHty restricts of stress and sensitivity ofthestmcturalresponses reliabmty cons廿aims withthenormal form isalso studied and thefomlulate pute tllesensitiVity are alsodeduced inthepaper. Finally some numerical examples show thatme method and reliabilityexpressions in thispaper are vaIidandfeasibIe. Keywords:Random Parameters structures