Study on Seismic Safety Improvement of Hanging Type Mechanical Structure during Long Duration Earthquake

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560277
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Dynamics/Control
• Research Institution: Tokyo City University
• Principal Investigator: FURUYA OSAMU 東京都市大学, 工学部, 准教授 (00290726)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 天吊形式 / 機械構造物 / 地震被害 / 耐震安全性向上 / 振動実験 / 累積疲労 / 対策技術

Outline of Final Research Achievements

A lot of seismic damages of hanging type mechanical structure in industrial facilities were occurred in Great East Japan Earthquake, and the industrial functions stopped at many facilities. This study has been carried out to upgrade the seismic safety improvement of hanging type mechanical structure in several industrial and plant facilities from analytical and experimental approaches. As the results, it was confirmed that the conservation of function and seismic safety of hanging type mechanical structure are obtained by following conditions including countermeasure for afterquake. One is that the frequency ratio between main structure and hanging type mechanical structure should be over 1.1 or under 0.9, and the other is that the damping ratio in the vibration system of hanging type mechanical structure should be over 20%.

Free Research Field

耐震工学，装置機器学