This thesis offers a thorough assessment of the dynamic performance and vibration comfort of a steel pedestrian footbridge under pedestrian-induced loading, building on the Sétra–AFGC framework. Because of its low mass and natural frequencies that can coincide with walking harmonics, the bridge is categorized as a Class II structure, necessitating thorough serviceability checks that go beyond simple static design. MIDAS Gen is used to create a high-fidelity 3D finite element model that captures both local and global dynamics, such as the elasticity of supporting bearings, realistic boundary conditions, and deck-support interaction. There are two phases to the analysis. Within the critical frequency bands for human-induced excitation, prominent horizontal modes in both lateral and longitudinal directions are revealed by a modal analysis, which first determines the natural frequencies and mode shapes.