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为了准确预测预应力混凝土结构的非线性行为,建立了基于纤维截面的预应力混凝土结构组合式分析模型。开发了一种粘结单元模拟预应力筋与混凝土间的粘结滑移,采用基于纤维截面的粘结单元模拟普通纵筋与混凝土的粘结滑移,模型还考虑了材料低周疲劳特性对结构损伤的贡献。利用3组预应力混凝土框架试验对模型进行了验证,结果表明:组合式模型不仅能够反映预应力混凝土结构在往复荷载作用下的强度退化、刚度退化以及捏缩现象,准确预测结构滞回曲线,也能准确地评估预应力混凝土结构在地震作用下的各种动力特性。模型计算量小,收敛性好,可作为预应力混凝土结构非线性分析的有效手段。
In order to accurately predict the nonlinear behavior of prestressed concrete structures, a combined analysis model of prestressed concrete structures based on fiber cross-section was established. A bonding unit was developed to simulate the bond slip between prestressing tendons and concrete. The bond-slip between common longitudinal reinforcement and concrete was simulated by the bond unit based on fiber cross-section. The model also considered the low-cycle fatigue property of material The contribution of structural damage. The model was verified by three sets of prestressed concrete frame tests. The results show that the combined model can not only reflect the strength degradation, stiffness degradation and pinch-shrink phenomenon of prestressed concrete structures under cyclic loading, but also accurately predict the structure hysteresis curve, It also accurately evaluates various dynamic characteristics of prestressed concrete structures under earthquake action. The model has a small amount of calculation and good convergence, which can be used as an effective method for nonlinear analysis of prestressed concrete structures.