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研究*
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（1 四川大学建筑与环境学院，成都 610065；2 重庆交通科研设计院，重庆 400067）[摘要] 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。[关键词] 桥墩;迭代算法; 数值模型; 弯矩曲率; 塑性铰中图分类号：TU375 文献标识码：A 文章编号：1002-848X(2013)S2-0445-04*桥梁工程结构动力学国家重点实验室开放基金（201201），桥梁结构抗震技术交通行业重点实验室资助（201201），教育部创新团队计划项目（ITR1027）。作者简介：陈成，硕士研究生，Email: chenchengnantong@gmail.com。Numerical model study of the relationship of moment-curvature and thrust-displacement in the plastic hinge zone based on mesostructureChen Cheng11, Zeng Xiangguo11, Tang Guangwu2, Chen Huayan11（1 College of Architecture and Environment , Sichuan University, Chengdu 610065, China; 2 Chongqing Communication Research & Design Institute, Chongqing 400067,.Cnina）Abstract: The constitutive relations of HRB335 rebar and C25 confined concrete have established separately according to the mesostructures of the rebar and concrete in the bridge pier. With the plane section assumption, loaded by curvature, the compression zone edge of the strain as intermediate parameters, a nonlinear iterative algorithm was developed and the relationship of moment-curvature and thrust-displacement was got. Compared with existing experimental results, the results based on our model are in good agreement with the experimental results. Therefore, the method and the nonlinear iterative algorithm have important theoretical significance and value in engineering about the ductility design of a bridge and the evaluation of the safety of a bridge.Keywords: bridge pier; iterative algorithm; numerical model; moment-curvature; plastic hinge
