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ABAUQS软件内嵌的损伤塑性模型已较多地被应用于混凝土结构有限元分析,但采用其对箍筋约束混凝土进行模拟的研究很少。研究了混凝土单轴受压应力-应变关系对损伤塑性模型模拟箍筋约束混凝土力学性能的影响。通过在损伤塑性模型中引入三种不同的混凝土单轴受压应力-应变关系曲线定义其受压行为,建立箍筋约束混凝土柱的三维非线性有限元模型。有限元分析结果与试验结果对比分析表明,在损伤塑性模型中采用合适的单轴受压应力-应变关系对模拟结果的准确度非常重要,并且应用本文建议的单轴受压应力-应变关系曲线对约束混凝土进行模拟具有较好效果。
The plastic damage plastic model embedded in ABAUQS software has been widely used in finite element analysis of concrete structures. However, few studies have been conducted on the simulation of stirrup-restrained concrete. The effect of uniaxial compressive stress-strain relationship of concrete on the mechanical properties of the confined concrete with stirrup reinforcement was investigated. By introducing three different uniaxial compressive stress-strain curves of concrete into the plastic model of damage, the three-dimensional nonlinear finite element model of the confined concrete column is established. The results of finite element analysis and experimental results show that it is very important to adopt the appropriate uniaxial compressive stress-strain relationship in the damage plastic model for the accuracy of the simulation results. The stress-strain curve of uniaxial compression Simulation of confined concrete has good effect.