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非线性统一强度准则将材料的强度特性分解为4个相互独立的因素,由4个材料参数分别描述,在主应力空间内的强度面连续光滑,存在连续的偏导数.本文将非线性统一强度准则作为屈服函数,以塑性剪应变的函数作为硬化/软化参数,硬化/软化函数参考单轴压缩条件下的应力应变关系给出,建立了混凝土材料的非线性统一弹塑性本构模型.通过混凝土材料单轴、双轴和三轴试验结果对本构模型的验证,以及偏心受压构件试验结果对数值模拟结果的验证表明,所建立的非线性统一弹塑性本构模型可较好地描述混凝土材料的三维变形与强度特性,并可反映应变软化特性,将模型用于数值计算时易于获得收敛解,且具有较高的精确度和计算效率.
The nonlinear uniform strength criterion decomposes the strength characteristics of the material into four independent factors, which are respectively described by four material parameters. The strength surface in the principal stress space is continuous and smooth with continuous partial derivatives. In this paper, the nonlinear uniform strength Criterion as a yield function, the plastic shear strain function is given as the hardening / softening parameter, and the hardening / softening function is given under the stress-strain relationship under uniaxial compression. A nonlinear unified elastic-plastic constitutive model of concrete is established. The verification of the constitutive model by the uniaxial, biaxial and triaxial test results of the material and the test results of the eccentric compression member verify the numerical simulation results show that the established nonlinear unified elastic-plastic constitutive model can describe the concrete Material three-dimensional deformation and strength characteristics, and can reflect the strain softening characteristics of the model used in numerical calculation easy to get the convergence solution, and with high accuracy and computational efficiency.