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基于弹性损伤普遍理论,取其三阶近似形式,得到一个含有四个独立参数的损伤本构模型。在该损伤本构模型中,引入一个拉压修正系数,用于描述混凝土材料在受拉与受压状态下损伤行为的不同。采用损伤力学有限元数值方法,对一钢筋混凝土拱结构整个加载过程中的非线性行为进行了详细分析计算,并与试验结果进行对比。研究表明,所建立的损伤本构模型,可较好地反映钢筋混凝土结构的非线性特征与规律。
Based on the general theory of elastic damage, taking the third-order approximation form, a damage constitutive model with four independent parameters is obtained. In this damage constitutive model, a tension and compression correction factor is introduced to describe the difference of the damage behavior of concrete under tension and compression. The nonlinear behavior of a reinforced concrete arch structure during the whole loading process is analyzed and calculated in detail by using the finite element numerical method of damage mechanics and compared with the experimental results. The research shows that the damage constitutive model established can well reflect the nonlinear characteristics and regularity of reinforced concrete structures.