偏心受压钢筋混凝土柱破坏性能的有限元分析

FE Analysis of Failure Behaviour of Reinforced Concrete Columns Under Eccentric Compression

给出了偏心受压钢筋混凝土柱破坏性能的有限元模拟的结果。混凝土被描述为各向同性硬化和软化的弹塑性模型。在受压区域,采用非对应塑变规则的Drucker-Prager准则,而在受拉区域,采用相关塑变规则的朗肯准则。借助一般性理论,通过软化区微观结构的特有长度对两个准则进行扩展。通过Mises准则的理想弹塑性关系描述增强效果,进行二维平面应变和三维模拟。对微观结构的不同特征长度、加固率、柱的长细比、偏心荷载、抗拉强度分布、混凝土与钢筋之间的粘结-滑移以及断裂能进行有限元计算。将有限元结果与Kim和Yang的试验结果进行定量比较,吻合较好。

Paper presents results of FE modelling of failure behaviour of reinforced concrete columns under eccentric compression. Concrete was described with an elasto-plastic model using isotropic hardening and softening. A Drucker- Prager criterion with a nonassociated flow rule was defined in a compressive region and a Rankine criterion with an as- sociated flow rule adopted in a tensile region. To ensure the mesh-independence and to capture strain localization in concrete, both criteria were extended by a characteristic length of microstructure in a softening regime with the aid of a non-local theory.