Steel plate concrete (SC) composite structure is now being recognized as a promising technology for application in nuclear power plants (NPPs) as it is faster and suitable for modular construction. It is required to identify its dynamic characteristics prior to perform the seismic design of the SC structure. Damping ratio of the structure is one of the critical design factors to control the dynamic response of structure. This paper compares the criteria for the damping ratios of each type of structures which are prescribed in the regulatory guide for the NPP. In order to identify the damping ratio of SC shear wall, this study made SC wall specimens and conducted experiments by shaking table test and vibration test with impact hammer. The experimental results show that the natural frequency from impact hammer test and shaking table test were 22.3Hz and 20.7Hz, respectively. The damping ratios were identified as about 5% that is similar to value of JEAC-4618.
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