考虑双重界面滑移的钢套筒植筋系统受力机理有限元分析

FE ANALYSIS ON LOAD TRANSFER MECHANISM OF BONDED REBARS WITH STEEL SLEEVE CONSIDERING SLIP OF TWO INTERFACES

为研究包含双重界面滑移的植筋系统受力机理,对钢套筒植筋系统进行考虑粘结滑移的非线性有限元分析。在钢套筒植筋系统中,由于钢筋和钢套筒均为钢材,材料性能类似,使得植筋胶与钢筋、植筋胶与钢套筒的粘结性能类似,因此胶筋界面和胶筒界面应有相类似的粘结滑移本构关系。利用钢套筒植筋试验研究得到包含胶筋和胶筒两个界面滑移的粘结滑移本构关系,采用均分方法得到钢套筒植筋系统的胶筋界面和胶筒界面独立分离的粘结滑移本构关系,在此基础上对钢套筒植筋系统进行考虑粘结滑移的ANSYS有限元分析。根据有限元分析结果,证明所建立的两个界面的粘结滑移本构关系合理。了解钢套筒植筋系统的粘结滑移受力机理,为进一步认识自由拉拔植筋系统的粘结滑移受力机理提供了基础。

To study the load transfer mechanism of bonded rebars including slip of two interfaces, the bonded rebars system of steel sleeve was studied by nonlinear FE analysis method. In the bonded rebars system of steel sleeve, because the material of steel sleeve is similar to the one of the steel bar, the bond performance between adhesive and steel bar is similar to the one between adhesive and steel sleeve, so that the bond-slip constitutive relationships of steel-adhesive interface and adhesive-sleeve interface are similar. Therefore, according to the bond-slip constitutive relationship including slip of two interfaces which was formed by the experimental research of steel sleeve, the respective and separate bond-slip constitutive relationships of two interfaces were formed by average division. Then by using these two constitutive relationships, the bonded rebars system of steel sleeve was studied by the FE analysis based on the ANSYS program considering slip of two interfaces. According to the analysis result, the bond-sllp constitutive relationships of two interfaces are reasonable, and the load transfer mechanism of the bonded rebars system of steel sleeve is understood, which is the fundamental work in the further cognition of the load transfer mechanism of the bonded rebars system.