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文章综合考虑混凝土、锚垫板和箍筋的材料非线性本构特性,探讨预应力锚固区加载破坏模式的发展过程,以确定其受压极限状态和极限承载力,为锚固区的工程设计提供参考。采用现有计算软件对锚固区的加载过程进行了三维模型的非线性有限元分析,其计算结果与实验结果符合较好,由此得到锚固区破坏模式发展和受压极限状态的初步规律。同时,对分析中所采用的混凝土本构模型进行讨论,分析结果显示,混凝土受高轴向应力时,本构模型如何恰当地反映混凝土横向膨胀变形是一个关键,如果混凝土的横向变形偏小,将导致计算得到的横向箍筋应变不足,其作用无法充分体现。在分析研究中,需要改进混凝土本构模型以更好地模拟实际情况。
In this paper, considering the nonlinear constitutive characteristics of concrete, anchor plate and stirrup, the development process of loading failure mode in prestressed anchorage zone is discussed to determine its ultimate compression and ultimate bearing capacity, which provides the engineering design for anchorage zone reference. The existing computational software was used to perform the nonlinear finite element analysis of the loading process of the anchorage zone. The calculated results are in good agreement with the experimental results. The initial regularity of the failure mode development and the ultimate compression state is obtained. At the same time, the constitutive model of concrete used in the analysis is discussed. The results show that the constitutive model is a key to properly reflect the lateral expansion and deformation of concrete under high axial stress. If the lateral deformation of concrete is too small, Will result in the calculation of horizontal stirrups lack of strain, its role can not be fully reflected. In the analysis, the concrete constitutive model needs to be improved to better simulate the actual situation.