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应用角点非共轴本构模型结合有限元方法分析浅基础的受力沉降问题。当非共轴塑性模量较小时,包含非共轴模型子程序的ABAQUS的非线性计算可能不收敛。深入地分析表明,不收敛问题是由于在塑性变形刚开始时,非共轴的塑性应变增量明显大于共轴的塑性应变增量。为了克服数值不收敛问题,对原有的角点非共轴模型加以改进。在改进的模型中,非共轴塑性模量是累加塑性剪应变的函数。计算结果表明,这个改进的非共轴模型提高了非线性计算的收敛性,同时保持了原有非共轴模型的功能。
The non-coaxial constitutive model of the corner and the finite element method are used to analyze the stress subsidence of shallow foundations. Non-linear calculations of ABAQUS with non-coaxial model subroutines may not converge when the non-coaxial plastic modulus is small. In-depth analysis shows that the non-convergence problem is due to the non-coaxial plastic strain increment being significantly larger than the coaxial plastic strain increment at the beginning of plastic deformation. In order to overcome the problem of numerical non-convergence, the original non-coaxial model of corner point is improved. In the improved model, the non-coaxial plastic modulus is a function of cumulative plastic shear strain. The calculation results show that the improved non-coaxial model improves the convergence of nonlinear computation while maintaining the original non-coaxial model.