017_预应力混凝土桥梁精细化全过程数值模拟技术.pdfVIP

预应力混凝土桥梁精细化全过程数值模拟技术 [李正] [江苏省交通规划设计院股份有限公司，210005] [ 摘 要 ] 传统的桥梁结构分析采用平面杆系，已经不能满足精细化设计、科研、监控的要求。本项目以 ANSYS 为二次开发平台，开发了出预应力混凝土桥梁精细化数值模拟系统。采用以空间实体 单元为基础的精细化总体模型，可以在设计或施工验算阶段发现并解决大部分问题，而且具有 快速、准确的特点。综合运用精细化总体模型和子模型技术，在保证计算精度的基础上，降低 模型规模和复杂程度，提高了工作效率。以此为基础，运用钢筋混凝土单元进行全过程分析， 可以高效地估算裂缝的宽度和严重程度的，评估增加钢筋量等措施对结构的改善效果。本文分 析了一座滑模逐跨施工的预应力混凝土箱梁桥，重现了各种措施对底板裂缝控制的效果，分析 表明该技术便捷、准确，实用性强。 [ 关键词 ] ANSYS 二次开发 预应力混凝土桥梁 子模型 钢筋混凝土单元 Numerical simulation technique for the whole process of Prestressed concrete bridges [ li zheng ] [Jiangsu Provincial Transportation Planning Design Institute, 210005] [ Abstract ] Traditional methods for analysis of the bridge structure have been unable to satisfy more accurate design, research, monitoring requirements. ANSYS has been chosen in this project as a secondary development platform, and a Prestressed concrete bridges numerical simulation system is developed. Using a accurate overall model, the deficiencies can be discovered and solved most quickly and accurately by checking calculation during design or construction. By means of the synthetic use of accurate overall model and submodeling, the calculation precision can be satisfied and the complicity and difficulty can be reduced. On this basis, the use of reinforced concrete elements in the process of analysis can be effectively assessed. Crack width has been calculated and effects of reinforcement bar amount on the structural behavior can be evaluated. A prestressed concrete box girders by stepping formwork construction method is selected in the research. The actual effect of various measures of the control of