Communications - Scientific Letters of the University of Zilina 2009, 11(1):50-54 | DOI: 10.26552/com.C.2009.1.50-54

Damage Identification Method with Structural Frequency Data from Modal Test

Du Jian-hua¹, Ouyang Zhiwei², Zhao Yangdong³

¹ School of Transportation, Shijiazhuang Institute of Railway Technology, Shijiazhuang, China

² School of Civil Engineering, Harbin Institute of Technology, Harbin, China

³ First Branch, CCCC First Highway Consultants Co., Ltd, Xi'an, China

Testing and analysis technology based on vibration mode is a common method to structural health monitoring and checking. This paper deduces the damage factor used for structural damage evaluation based on test frequency of structure, makes a finite element numerical simulation using ANSYS software and model test to a pressure pipe. Here a stiffness reduction method is utilized to reproduce the damage state of a single-point and multiple-point, damage identification is carried out with a FEM model of redundant pipe. Meanwhile, a model experiment system is designed to validate the efficiency of damage factor with cutting-groove to simulate damage states. Numerical and experimental results show the proposed damage factor is theoretically breviate, simple realization and high-accuracy performance, therefore, it has a good usage prospect in the implementation of structural damage monitoring and identification.

Keywords: vibration mode; structural damage evaluation, damage factor, damage state

Published: March 31, 2009  Show citation