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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。
A unit model for the analysis of prestressed concrete structures is proposed. Through the degree of freedom transformation, the node degree of freedom of the space bar element is represented by the node degree of freedom of the solid element, so that the meshing of the element does not need to consider the orientation of the prestressed steel bar, ie, the nodes of the bar element do not need to be fixed on the solid element node. The prestressed concrete structure was simulated. The use of a separate space bar element to simulate the prestressed steel bar can directly solve the deformation and internal forces generated by the prestressed structure. Applying the unit information generation technology proposed in this paper, the information in the combined unit can be conveniently generated. The example verification analysis shows that the model is convenient and feasible, the unit division efficiency is high, and it can reach considerable accuracy.