The increasing trend toward slender and low-stiffness pedestrian bridge designs has significantly raised their susceptibility to dynamic excitations induced by pedestrian activity. One of the most critical vibration phenomena in such structures is synchronous excitation, which occurs when the walking frequency of pedestrians coincides with the natural frequency of the bridge. This resonance condition can amplify the structural response, negatively impacting both user comfort and overall structural performance. These challenges are particularly relevant in densely populated urban environments such as Lima. In this study, the dynamic behavior and comfort performance of the “Católica” pedestrian bridge were evaluated through in-situ vibration measurements using a geophone-based seismograph. The recorded data were analyzed based on the SETRA guideline, which classifies comfort into four...