Table of Contents
Journal of Structures
Volume 2014, Article ID 520310, 7 pages
Research Article

Damage Location Index of Shear Structures Based on Changes in First Two Natural Frequencies

Mita Laboratory, Department of System Design Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan

Received 20 February 2014; Accepted 23 April 2014; Published 22 June 2014

Academic Editor: Yiyang Li

Copyright © 2014 Hien HoThu and Akira Mita. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A method of detecting the location of damage in shear structures by using only the changes in first two natural frequencies of the translational modes is proposed. This damage detection method can determine the damage location in a shear building by using a Damage Location Index (DLI) based on two natural frequencies for undamaged and damaged states. In this study, damage is assumed to be represented by the reduction in stiffness. This stiffness reduction results in a change in natural frequencies. The uncertainty associated with system identification methods for obtaining natural frequencies is also carefully considered. Some simulations and experiments on shear structures were conducted to verify the performance of the proposed method.