A FUNDAMENTAL STUDY ON THE DIAGNOSIS METHOD OF EXISTING RC STRUCTURES USING THE CHARACTERISTICS OF HAMMERING SOUND

  • Yuki Fukui Kyushu University, Fukuoka, Japan
  • Yoshimi Sonoda Kyushu University, Fukuoka, Japan

Abstract

Many infra-structures, which constructed in the period of rapid economic growth in Japan, have shown serious  ageing  deteriorations  in  recent  years.  Maintenance  and  nondestructive  testing  of  existing structures are one of the important research topics, and many kinds of nondestructive testing method have been proposed. However, most of them need expensive measurement hardware and require adequate measuring condition. As one of the few convenient existing methods, a hammering test has been used widely in the actual field site. This inspection method is easy to implement and detect the existence of defects. However it requires enough experience to evaluate the hammering sounds. Thus, it is very difficult to evaluate the defect condition such as their width and depth. In the previous study, maximum value of sound pressure and duration are often applied for defect detection, but these are not enough for evaluating the precise defect conditions. On the one hand, although frequency spectrum is also used, it is still difficult to find a specific tendency with respect to the peak spectrum range and value. From these backgrounds, we conducted hammering test to existing deteriorated bridge piers. Furthermore, we applied the Self-Organizing Map algorithm in order to construct the diagnosis system of defect condition with assessing the obtained hammering sound data comprehensively, such as maximum sound pressure, sound spectrum, and  vibration  damping.  As  a  result,  we  could  take  into  account  the  difference  of  hammering  sound characteristics effectively and distinguish the degree of deterioration clearly.

Published
2011-08-01
How to Cite
FUKUI, Yuki; SONODA, Yoshimi. A FUNDAMENTAL STUDY ON THE DIAGNOSIS METHOD OF EXISTING RC STRUCTURES USING THE CHARACTERISTICS OF HAMMERING SOUND. EACEF - International Conference of Civil Engineering, [S.l.], v. 1, p. 044, aug. 2011. Available at: <http://proceeding.eacef.com/ojs/index.php/EACEF/article/view/236>. Date accessed: 19 may 2024.
Section
Group of Building Materials Engineering (Nanotechnology)