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A model updating procedure for developing a finite element model for the Seohae Bridge is proposed. The bridge is a slab-on-stringer cable-stayed bridge with a main span of 470 m and has been in operation since 2000. Natural frequencies and mode shapes identified from ambient vibration measurements with the dense application of 80 accelerometers were used as target values in developing the model. The procedure consists of two consecutive steps. The first step is to establish a baseline model using a manual tuning method, which utilizes construction and maintenance history as well as the initial design information. Variations in natural frequencies due to temperature changes are also considered in the manual tuning with the help of long-term monitoring data regarding natural frequencies and temperature. Although the manual tuning was done efficiently, errors between the analysis and measurement of …