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为解决实体单元模型在大型复杂结构极限承载力分析时计算不收敛的问题,将预应力钢绞线和钢筋作为单元中的块,利用实体退化的板单元建模模拟混凝土材料,用Ohtani-Chen多重强化模型考虑混凝土的材料非线性,采用理想弹塑性模型考虑钢筋的材料非线性,用安全拉格朗日法考虑结构的几何非线性,对混凝土裂缝采用正交模型处理。模拟计算了一简支空心板梁的加载破坏过程,与实体梁加载试验结果具有良好的一致性,对一5跨连续预应力高墩刚构桥梁的极限承载力进行了计算,并与相同工程背景下采用通用ABAQUS有限元程序的分析结果进行比较。结果表明:所提方法能有效克服混凝土裂缝引起的计算不收敛现象,得到结构最终的破坏形态。
In order to solve the problem of non-convergence of solid element model in the analysis of ultimate bearing capacity of large and complex structures, prestressed steel strand and steel bar are used as blocks in the unit, and concrete degenerated plate elements are used to simulate the concrete material. Ohtani-Chen The multi-reinforcement model considers the material nonlinearity of the concrete, adopts the ideal elastic-plastic model to consider the material nonlinearity of the reinforcement, considers the geometric nonlinearity of the structure by the safety Lagrange method, and treats the concrete crack by the orthogonal model. The load failure process of a simply supported hollow slab beam is simulated and the results are in good agreement with those of solid beam test. The ultimate bearing capacity of a rigid-frame bridge with a span of 5 continuous prestressed high pier is calculated and compared with the same project In the background, the results of the analysis using the general ABAQUS finite element program are compared. The results show that the proposed method can effectively overcome the non-convergence of calculation caused by concrete cracks and obtain the ultimate failure mode of the structure.