基于截面配筋率的钢筋混凝土统一本构关系研究

Study on Unified Constitutive Relation of Reinforced Concrete Based on Section Reinforcement Ratio

为避免数值化分析中直接处理钢筋与混凝土之间的复杂关系,推导出钢筋混凝土构件轴心受压统一理论公式,做了不同配筋率与不同混凝土强度等级下的钢混棱柱体轴心受压试验,利用试验量测的荷载位移数据,结合Matlab曲线拟合工具的线性回归与拟合功能,建立了一种基于截面配筋率的能够描述钢筋混凝土材料力学性能的统一本构关系。对试验梁进行数值化分析表明,所建立的数值化模型应力应变特征与试验结果吻合较好,证明了该模型在钢筋混凝土实际运用过程中的可行性与适用性。

In order to avoid directly dealing with the complex relationship between steel bar and concrete in numerical analysis,a unified theoretical formula for axial compression of reinforced concrete members was derived,and axial compression tests of steel-concrete prisms with different reinforcement ratios and different concrete strength grades were carried out.Based on the load displacement data measured by the test,combined with the linear regression and fitting function of Matlab curve fitting tool,a unified constitutive relationship based on the section reinforcement ratio was established,which could describe the mechanical properties of reinforced concrete materials.Through the numerical analysis of the test beam,the results show that the stress-strain characteristics of the numerical model based on the unified constitutive relationship has better tally with test result,which proved the feasibility and applicability of the model in the practical application of reinforced concrete.