陈松，柯敏勇，刘海祥，洪晓林
(南京水利科学研究院，南京210024)

[摘要] 提出了一种针对预应力混凝土结构分析的单元模型。通过自由度变换，把空间杆单元的节点自由度用实体单元的节点自由度来表示，使得单元网格划分不必考虑预应力钢筋的方位，即杆单元的节点无须固定在实体单元节点上，共同模拟了预应力混凝土结构。采用单独的空间杆单元模拟预应力钢筋，能直接求解预应力对结构产生的变形和内力。应用本文提出的单元信息生成技术，可方便地生成组合单元中的信息。实例验证分析表明，该模型方便可行，单元划分效率高，且能达到相当的精度。
[关键词] 预应力混凝土结构；组合单元；自由度变换；空间杆单元

Combined finite element model of prestressed concrete structure and its mesh generation
Chen Song, Ke Minyong, Liu Haixiang, Hong Xiaolin
(Nanjing Hydraulic Research Institute, Nanjing 210029)

Abstract: A kind of element aiming at prestressed concrete structure analysis was proposed. By the method of transforming the node DOF of the space bar element to the node DOF of the space solid element, the position and direction of prestressed reinforced needn't be taken into account, that is, the node of bar element needn't be fixed on the node of space solid element. The prestressed concrete structure were simulated together. Independent space bar element was adopted to simulate prestressed reinforced, which can directly solve the displacement and internal forces of the structure by prestress. Using the technique of mesh generation, the information of element can be convenient to generate. It is shown that through prestressed concrete structure analysis by using this kind of element, the model is applicable and effective.
keywords: prestressed concrete structure;  combined finite element model;  mapping of freedom degree;  space bar element