This study proposes a technique for the establishment of an analytical model based on field-measured data. This technique is applied to the Gwangan Bridge, a suspension bridge in Korea, to propose an analytical model reflecting the as-built state of the bridge for the purpose of maintenance. The exploited field-measured data are surveyed coordinates of the target points located in the main cables, stiffening trusses and towers, thermal measurements at the time of survey, tensions of the hangers, and measured dead loads during construction. An ambient vibration test has been also carried out to identify the dynamic characteristics of the bridge. Based on the identified natural frequencies, a FE model updating procedure has been applied to enhance the dynamic reproducibility of the model
