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本文应用非线性有限元法分析钢筋混凝土简支与连续深梁的非线性性能。采用Chen—Chen模型建立了混凝土弹塑性本构关系,结合Bazant Z P断裂带理论建立了考虑软化后混凝土的单向,双向正交开裂的本构关系。编制了非线性分析程序,研究了混凝土抗压强度,剪跨比、配筋率等参数对深梁抗剪强度的影响,依据相关系数的概念提出了深浅梁分界的标准。同时在分析支座实际状况的基础上提出了一个较理想的支座处理方法。
In this paper, nonlinear finite element method is used to analyze the nonlinear behavior of reinforced concrete simply-supported and continuous deep beams. The Chen-Chen model was used to establish the elasto-plastic constitutive relation of concrete, and the Bazant Z P fracture zone theory was used to establish the constitutive relation of one-way and two-way orthogonal cracking of the concrete considering softening. A nonlinear analysis program was developed to study the influence of parameters such as compressive strength, shear-span ratio and reinforcement ratio on the shear strength of deep beams. The criteria for the boundary of deep beams were proposed based on the concept of correlation coefficient. At the same time, based on the analysis of the actual conditions of the bearings, an ideal support method is proposed.