To improve the noise and vibration problems of the existing public parking systems, new floor system was proposed. This system consists of the Sandwich Plate System(SPS), steel beam and post-tensioned steel tendons. To verify the dynamic characteristics such as the natural frequency and damping ratio of the system, the free vibration test was performed. Test results showed that the natural frequency of the SPS composite beam was 23.8Hz and it was increased by 3.8% by installing the post-tensioned tendons. The damping ratio of the specimen with tendons was about 1.64%.

1. 서론
 2. 휨재의 동적 특성에 대한 이론적고찰
  2.1 고유진동수
  2.2 감쇠율
 3. 실험 계획
  3.1 실험체 종류 및 형상
  3.2 실험체 Setup 및 계측계획
 4. 실험 결과
  4.1 고유진동수
  4.2 감쇠율
 5. 결론
 감사의 글
 References

• 류재호(고려대학교 건축사회환경공학부,) | Ryu, Jae-Ho
• 주영규(고려대학교 건축사회환경공학부) | Ju, Young-Kyu
• 윤성원(서울과학기술대학교 건축학부) | Yoon, Sung-Won Corresponding author