In this study, the natural frequencies of long-span truss bridges with LRB were analyzed and compared. As a result of the mode analysis, a similar mode shape was shown irrespective of whether LRB was applied or not. The natural frequency analysis using the measurement data, the natural frequencies of the first to third transverse modes could not be analyzed due to the small dynamic response, and the natural frequency of the fourth vertical mode was analyzed to be similar to the mode analysis results. As a result of comparing the natural frequency of the vertical direction mode of 18 truss bridges in the past, the bridge with LRB was analyzed to have smaller natural frequency than the bridge without LBR.

Abstract
 1. 서 론
 2. 모드해석 및 고유진동수 분석
 3. 모드형상 결과
 4. 고유진동수 분석 결과
 5. 결 론
 참고문헌

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