External strengthening of RC beams with carbon fiber-reinforced polymer (CFRP) offers an effective means to extend the service life of structures and enhance their structural performance, being particularly attractive due to the outstanding mechanical properties of CFRP [1]. The structural response of such strengthened structural RC members is complex and non-linear, their strength often determined by the CFRP-concrete bond behaviour and strength. This study focuses on the numerical modelling of such strengthened systems by proposing a cost-efficient, displacement-based corotational layered beam finite element (FE) model inspired by [2], explicitly incorporating the CFRP-concrete interface governed by a bond-slip law. The relative displacement between concrete and CFRP is modeled through dedicated degrees of freedom added to the classical FE beam formulation. The interface behaviour is governed by a non-linear bond-slip law decoupled from other constitutive relations, allowing to account for plastic energy dissipation at the interface for a physically representative and predictive model. The model is shown to accurately simulate the load-deflection behaviour of CFRP-strengthened beams and shows good agreement with experimental results. 1] M. Hammad et al. A State-of-the-Art Review on Structural Strengthening Techniques with FRPs: Effectiveness, Shortcomings, and Future Research Directions, Materials, Vol. 17.6, pp. 1408, 2024 [2] A. Aprile, E. Spacone, S. Limkatanyu, Role of Bond in RC Beams Strengthened with Steel and FRP Plates, Journal of Structural Engineering, Vol. 127.12, pp. 1445–1452, 2001.