This paper proposes a comprehensive study on the vibration serviceability assessment of a newly built steel arch bridge located in Central Italy (Marche Region) based on both numerical and experimental investigations.

Firstly, a finite element model of the bridge is developed and a numerical investigation of the modal properties and the dynamic response under operational conditions, which include wind and pedestrian loads, is carried out.

Then, the experimental investigation of the structure’s dynamic response is presented. Various dynamic tests were conducted on site, including: (i) a comprehensive modal identification of the entire bridge under ambient excitations using operational modal analysis (OMA); (ii) an analysis of modal property variations during the static proof test carried out to assess the bridge’s load-bearing capacity prior to opening; and (iii) an evaluation of pedestrian-induced effects through dynamic tests performed in accordance with national and European codes, as well as the HIVOSS and SETRA guidelines.

The integrated numerical and experimental approach presented in this study provides valuable insights into the dynamic behaviour of the bridge case study, offering an example of robust framework for assessing vibration serviceability in line with current standards and supporting the design and safety evaluation of similar pedestrian structures.