This study proposes a steel plate retrofit method and a polyurea method to improve the structural stability and usability of a factory floor slab with a thickness of 120mm. To assess vibration changes, vibrations were measured before and after retrofit. A numerical analysis model was also developed to evaluate improvements in structural safety and usability. The natural frequency increased from 11.4Hz to 17Hz through steel plate reinforcement, confirming an increase in slab stiffness. The damping ratio increased from 2.3% to 3.2% with polyurea reinforcement, indicating improved vibration reduction. Additionally, numerical analysis modeling showed that the natural frequency increased from 13.9Hz to 16.2Hz due to the steel plate reinforcement, enhancing the dynamic characteristics of the floor slab and confirming the reliability of the analysis model.

Abstract
1. 서론
    1.1 연구개요
    1.2 진동에 대한 사용성 기준
    1.3 연구동향
2. 대상 구조물 보강법
3. 진동측정 및 분석방법
    3.1 개요
    3.1 측정 장비
    3.2 측정 방법
    3.3 감쇠율 산정 방법
4. 진동측정 결과
    4.1 4층 진동측정 결과
    4.2 5층 진동측정 결과
5. 유한요소해석
    5.1 유한요소해석 개요
    5.2 유한요소해석 절차
    5.3 유한요소해석 결과
5. 결론
감사의 글
References

• 김재영(세종대학교 건축공학과 딥러닝 건축연구소, 석사과정) | Kim Jae Young (Deep Learning Architecture Research Center, Department of Architectural Engineering, Sejong University)
• 이가윤(세종대학교 건축공학과 딥러닝 건축연구소 박사후과정, 공학박사) | Lee Gayoon (Deep Learning Architecture Research Center, Department of Architectural Engineering, Sejong University)
• 이성민((재)한국건설품질연구원 부원장, 공학박사) | Lee Sung-Min (Korea Construction Quality Research Center(KCQR))
• 이기학(세종대학교 건축공학과 딥러닝 건축연구소 교수, 공학박사) | Lee Kihak (Deep Learning Architecture Research Center, Department of Architectural Engineering, Sejong University)
• 김재현(㈜에이톰엔지니어링, 대표) | Kim Jae-Hyun (Atom Engineering, CEO) Corresponding author