2023 Volume 79 Issue 13 Article ID: 22-13030
The damping characteristics shown in the Specifications for Highway Bridges and their explanations are specified based on past experimental results. The calculation results of damping characteristics using seismic observation records of actual bridges are not directly reflected. The attenuation characteristics of highway bridges are not sufficiently verified due to the lack of actual measurement records. Therefore, we thought it necessary to verify the set values of damping characteristics based on actual measurement records. In this study, using a highway bridge as a case study, we calculated the natural frequency and damping characteristics by system identification based on the subspace method using the records observed at multiple points in the entire bridge system. Furthermore, this study suggests the possibility of calculating the natural frequencies and damping characteristics of bridge components such as the ground and bearings by using system identification.
