The mitigation of seismic vulnerability in existing structures is a critical challenge in modern engineering. The implementation of energy dissipation devices has proven to be an effective solution for improving seismic resilience and reducing the risk. Numerous studies have demonstrated the effectiveness of damping systems in reducing excessive displacements and mitigating the impact of seismic forces on structural elements. In this frame, a novel approach to energy dissipation is discussed, based on the use of dampers able to exhibit variable friction depending on the external loading that here has been referred to as Variable Friction Dampers (VFDs). VFDs are able to modulate their dissipation capacity by combining a constant friction component with a variable damping component that increases as soon as the displacement increases, so an appropriate energy dissipation is provided based on the dynamic response of structures. The intrinsic characteristics of this innovative dissipation system in reducing displacements and mitigating seismic forces are numerically analyzed, with a focus on key design variables. For this purpose, a numerical model of the VFD system is developed, and a comparative seismic response analysis is carried out to evaluate its effectiveness under different seismic excitations. Considering the growing interest in developing effective strategies to reduce the impact of dynamic loads on strategic civil structures, applications for bridges are considered here.