预应力混凝土梁非线性分析单元模型.PDF

第7 卷　第5 期 交 通 运 输 工 程 学 报 Vol.7　No.5 2007 年10 月 Journal of T raffic and Transportation Engineering Oct .2007 :1671-16 7(2007)05-0068-05 1 1 2 张　峰, 叶见曙 , 徐向锋 (1. , 　210096;2. , 　25002 ) 　:为了能够准确有效地分 混凝土梁中预应力钢筋的力学性能, 模拟结构中存在的普通钢 筋、预应力直线钢筋和预应力曲线钢筋, 提出了一种预应力混凝土梁非线性分 的单元模型。应用 有限元理论, 采用全拉格朗日列式的三维杆单元模拟预应力钢筋;采用实体退化组合壳单元模拟结 构;应用钢筋单元和混凝土单元之间的位移场关系形成钢筋对混凝土单元的贡献, 将预应力钢筋对 结构的作用直接反映在单元模型内部。预应力混凝土T 梁的破坏过程模拟结果表明梁的跨中挠 度计算结果和试验实测数据吻合, 单元模型有效地反映了预应力束的力学性能。 :桥梁工程;预应力混凝土梁;曲线预应力钢筋;实体退化组合壳单元;非线性分 ;有限元程序 :U441.5　　　:A Nonlinear analysis element model of prestressed concrete beam 1 1 2 Zhang Feng , Ye Jian-shu , Xu Xiang-feng (1.School of Transportation, Southeast University, Nanjing 210096, Jiangsu, China; 2.Department of Civil Engineering, Shandong Jiaotong University, Jinan 25002 , Shandong, China) Abstract:In order to analyze the mechanics properties of tendon exactly and effectively, simulate normal steel bar, linear tendon and curved tendon in prestressed concrete beam, a nonlinear analysis element model of prestressed concrete beam w as presented.In the model, based on finite element method, tendon w as simulated by -D link bar element of total Lagrangian method, solid degenerated-combined shell element w as used to simulate prestressed concrete beam, and the stiffness of link element contributing to concrete element w as computed according to the displacement relationship of tendon element and shell element, the action of tendon contributing to the structure was directly reflected inside the element.The simulation result of the destroyed process of prestressed concrete T beam show s that the