计入局部刚度和稳定约束的钢桥面板优化设计  

Optimized Design of Orthotropic Steel Deck Stiffened Plate

作　　者：李立峰[1] 邵旭东[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2009年第1期14-18,共5页Journal of Hunan University:Natural Sciences

基　　金：湖南省自然科学基金资助项目(02JYY3058)

摘　　要：采用有限元法和优化技术相结合的方法同时解决钢桥面板的局部受力问题与局部稳定问题,其中钢桥面板的结构分析采用等效格子梁法,编制了分析程序;钢桥面板的局部稳定计算采用日本规范.以计入结构材料重量和焊缝体积的结构造价为目标函数,建立了考虑局部受力和稳定容许应力约束的钢桥面加劲板优化分析模型.利用ANSYS软件的优化分析功能,采用可行方向法进行优化迭代分析,并将该方法应用到某钢箱梁的优化分析中.优化结果表明:适当增加横隔板间距、加大顶板和U肋厚度能更有效地满足结构受力和局部稳定要求.优化结果可作为钢箱梁设计的参考.The finite dement method combined with optimization was applied to the structural analysis of the local stability of orthotropic steel deck plate. The structural analysis of the orthotropie deck plate was conducted in the equivalent grillage method. The local stability of the orthotropic deck plate was analyzed with the Japanese bridge spedfication. A model for the optimization design of orthotropic steel deck plate was provided, in which the structural cost was taken as the objective function, and the rigidity and allowed stress of the orthotropie steel deck plate were taken as the constraints. The optimization function of FEM prcgram-ANSYS was applied, and the optimization method was FDM. The optimized results have shown that the mechanical demands of the orthotropic steel deck stiffened plate am more easily met with larger span of cross beam and thicker top plate and U-stiffeners. These significant conclusions can be used as a reference for the design of steel box girders.

关 键 词：桥梁工程 正交异性钢箱梁 优化 加劲板 局部稳定 

分 类 号：U448.36[建筑科学—桥梁与隧道工程]