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根据桥梁矩形截面内混凝土和钢筋的细观结构,分别建立了HRB335钢筋弹塑性强化本构关系和C25优化的约束混凝土本构关系,利用平截面假设,采用变形曲率加载,以受压区边缘应变作为中间参量,发展了一种非线性迭代算法,获得了矩形截面桥墩弯矩-曲率和横向推力-墩顶位移的关系曲线。并与现有的试验结果进行了比较,结果表明:发展的基于细观结构塑性铰区弯矩-曲率和墩顶推力-位移关系的数值模型预测的结果与试验吻合较好。提出的模型和相适应的非线性迭代算法对于桥梁的延性设计与桥梁结构的安全性评定具有重要的理论意义和工程应用价值。
Based on the mesostructure of concrete and steel bar in the rectangular section of the bridge, the constitutive relation between the elastic-plastic behavior of the HRB335 steel and the C25-optimized constitutive model was established respectively. By using the assumption of flat section and loading with the deformation curvature, As an intermediate parameter, a nonlinear iterative algorithm was developed to obtain the curve of moment-curvature and lateral thrust-pier displacement of rectangular section pier. Compared with the existing experimental results, the results show that the numerical model predictions based on the bending moment-curvature and pier thrust-displacement relationship of the plastic hinges in the meso-structure are in good agreement with the experimental results. The proposed model and the corresponding non-linear iterative algorithm have important theoretical significance and engineering application value for the design of bridge ductility and the safety assessment of bridge structure.