• Title/Summary/Keyword: Logarithmic Decrement Method

Search Result 21, Processing Time 0.014 seconds

Vibration testing using the movement of a 60ton crane for the evaluation the stability of nearby stone cultural heritage. (60톤 크레인의 주행 진동 실험을 통한 인접 석조 문화재의 안정성 평가)

  • Lee, Ga-Yoon;Ra, Young-Eun;Lee, Jong-Hak;Lee, Sung-Min;Lee, Kihak
    • Journal of Korean Association for Spatial Structures
    • /
    • v.24 no.1
    • /
    • pp.47-55
    • /
    • 2024
  • The aim of this study is to evaluate the possibility of damage to cultural assets resulting from vibrations generated by construction vehicle traffic. The cultural heritage's natural vibration frequency was determined to be 150Hz by measurement. The damping ratios were calculated as 4.7% using the logarithmic decrement approach and 4.3% using the half-power method. The vibration measurements obtained during vehicle operation indicated that, despite an increase in vehicle velocity of up to 15 km/h, the vibrations remained below the detectable level of 0.13 mm/sec. When the road is curved and the terrain is sloped, a suitable speed for vehicle operation was found to be around 17 km/h, at which point vibrations were seen. The highest recorded vibration amplitude at this velocity was 0.217 mm/sec, which remains below the stringent regulation limit of 2 mm/sec. Thus, it can be concluded that there is no actual harm caused by vibrations.