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The effectiveness of seismic isolation in slender structures subjected to intense ground motion can be compromised by unwanted uplifting, a phenomenon often observed in frictional bearings featuring spherical sliding surfaces, such as the Friction Pendulum System (FPS) device. One solution to this issue involves incorporating a mechanism within the isolation devices to prevent uplifting. This study introduces an innovative numerical formulation for the tension-restraint Friction Pendulum isolator, referred to as the XY-FP bearing, which integrates complete frictional coupling and accounts for large displacements. Unlike conventional designs, the XY-FP bearing employs cylindrical sliding surfaces to achieve its isolation mechanism. Two structural models were created to investigate the dynamic behavior disparities between isolation systems utilizing cylindrical versus spherical frictional ...