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约束混凝土是克服高强混凝土脆性的重要措施,采用高强箍筋约束能够有效的改善受压构件的力学性能。同时,约束混凝土的本构关系是结构非线性分析的基础,本构关系的选取对计算结果的合理性有显著影响。该文基于多组高强箍筋约束高强混凝土轴压试验数据,提出了改进的约束混凝土本构模型,分析了高强箍筋应力的发挥水平,给出了约束混凝土峰值应力、峰值应变和极限应变的计算公式。计算结果表明建议的本构模型与试验曲线符合较好。该模型可用于高强箍筋约束混凝土构件的非线性分析。
Constrained concrete is an important measure to overcome the brittleness of high-strength concrete. The use of high-strength stirrup restraints can effectively improve the mechanical properties of compression members. At the same time, the constitutive relation of confined concrete is the basis of nonlinear structural analysis. The selection of constitutive relation has a significant influence on the rationality of the calculated results. Based on the experimental data of multiple columns of high-strength concrete confined by high-strength stirrups, this paper presents an improved constitutive model of confined concrete, analyzes the level of stress in high-strength stirrups, and gives the peak stress, peak strain and ultimate strain of confined concrete Calculation formula. The calculation results show that the proposed constitutive model is in good agreement with the experimental curve. The model can be used to analyze the nonlinear behavior of concrete members with high strength stirrups.