PURPOSES : In this paper, the measurement criteria was determined by assessing the factors influencing the measurement of bending resonance frequency which is not specified in KS F 2437. METHODS : The durability evaluation analysis of concrete beam specimens was performed immediately after freezing and thawing processes. It is primarily aiming at improving the repeatability and reproducibility of measurement results by providing measurement criteria for various measurement factors that can occur during the collection of resonance frequency data. An independent concrete durability test (KS F 2456) was executed with the proposed measurement protocol for evaluation.
RESULTS : A measurement protocol was proposed to determine the transverse resonance frequency of concrete beam specimens.
CONCLUSIONS : It was concluded that the proposed measurement protocol may be used for the concrete durability test; where the resonance frequency could be stably collected.

ABSTRACT
1. 서론
2. 공명진동수 측정 영향인자에 대한 기존 연구분석 및 실험계획
    2.1. 공시체 온도
    2.2. 공시체 표면 습윤 상태
    2.3. 측정 기준면의 일관성
    2.4. 횡진동을 벗어나는 편심측정의 영향
    2.5. 측정 시 pickup 밀착을 위한 그리스 사용여부
3. 공명진동수 측정에 따른 영향 인자의 민감도 분석
    3.1. 시편 온도의 영향
    3.2. 시편 습윤 상태의 영향
    3.3. 측정기준면에 따른 영향
    3.4. 횡진동을 벗어나는 편심측정의 영향
    3.5. 측정 시 pickup 밀착을 위한 그리스 사용여부
    3.6. 소결
4. 제안된 횡진동의 공명진동수 측정방법의 적용성평가
5. 결론
REFERENCES

• 김남호(한국기술교육대학교 디자인 건축공학부) | Kim namho
• 정현수(한국기술교육대학교 일반대학원 건축공학) | Jung hyeonsoo 교신저자
• 김노아(한국기술교육대학교 일반대학원 건축공학) | Kim noah