STUDY ON FINITE ELEMENT ANALYSIS METHOD FOR BONDING PERFORMANCE OF POST-INSTALLED REBAR SYSTEM UPON COHESIVE ELEMENT

The excellent performance between different materials is crucial for ensuring their joint load-bearing capacity and significantly influences the mechanical and deformation properties of structural components. Finite element analysis (FEA) is commonly employed to simulate interfacial bonding behaviors, utilizing various element types. After reviewing the advantages, disadvantages and, applicable conditions of five commonly used bonding elements, the cohesive element was recommended to simulate the complex bonding behaviors in a special post-installed rebar system. Comparative simulations revealed that: except for the 0-thickness cohesive contact, the numerical results of 0-thickness element, of the element with thickness and, of the dual-interface model closely aligned with the experimental ones. Among these, the dual-interface model most accurately simulated the bonding damage modes of different interfaces of the post-installed rebar. Further analyses using the dual-interface model obtained the shearing stress and deformation behaviors at the adhesive-rebar interfaces, and reconstructed the entire failure damage process. These analyses reasonably explained the damage mechanism and the stiffness softening phenomenon observed in the load-slip curves. The results validated the advantages and applicability of the dual-interface model for the FEA of the post-installed rebar system.