The research manuscript deals with the brief introduction to the development and the validation of the new coupled numerical formulation, comprised of the Rigid Body Spring Model (RBSM) and the solid Finite Element Method (FEM) evaluating the bond behavior and…
The research manuscript deals with the brief introduction to the development and the validation of the new coupled numerical formulation, comprised of the Rigid Body Spring Model (RBSM) and the solid Finite Element Method (FEM) evaluating the bond behavior and failure mechanism of the actively confined and unconfined RC specimens loaded under pull-out test. The RBSM has been referred as an effective numerical framework for the evaluation of nonlinear mechanical response of concrete, quantitatively. However, the modeling of the reinforcing steel in RBSM has difficulty for simulating the complex behavior of steel such as elastoplasticity. Therefore, this limitation refers towards the development of new numerical formulation, i.e., coupled RBSM-FEM. In coupled RBSM-FEM, steel embedded in concrete is modeled using eight noded nonlinear solid finite elements considering the actual geometrical features e.g., rib height, shape and lug spacing, etc. In the coupled numerical formulation, concrete is modeled using RBSM. The boundary interfaces between concrete and steel (Solid FEM) has been accomplished through link element. The link element on the interface between RBSM element and solid FEM element consists of two shear springs and one normal spring. The proposed model is validated through the experimental investigations on RC specimens loaded under pull-out test with and without externally applied normal pressure. The proposed model has capability to simulate the internal fracture mechanism of concrete and elastoplastic behavior of the steel.