DAMAGE IDENTIFICATION USING CHANGES OF EIGENFREQUENCIES AND MODE SHAPES |
| |
| Affiliation: | 1. Dynamical Systems and Risk Laboratory, Civil and Environmental Engineering, School of Engineering, University College Cork, Ireland;2. Communication and Signal Processing Research Group, Department of Electrical and Electronic Engineering, Imperial College, London, UK;3. Civil and Architectural Engineering, The Royal Institute of Technology (KTH) Stockholm, Sweden;4. Department of Civil Engineering, Indian Institute of Science, Bangalore, Karnataka, India;1. CONSTRUCT-LESE, Faculty of Engineering, University of Porto, Portugal;2. LNEC, Laboratório Nacional de Engenharia Civil, Portugal;3. CONSTRUCT-LESE, School of Engineering, Polytechnic of Porto, Portugal;4. Department of Structural Engineering, University California San Diego, USA |
| |
| Abstract: | In the present paper, we describe an approach to identify the location and the extent of the damage introduced into the steel frame, using a two-step procedure. In the first step, the measured dynamic response of the original undamaged structure was used to generate a reference finite element (FE) model of the structure. The selected parameters were identified by means of a mathematical optimisation algorithm (‘updating procedure'), minimising an objective function containing the test/analyses differences of eigenfrequencies and mode shapes. The uncertain model parameters had to be chosen with care in order to retain the physical significance of the updated model. In the next step, the experimental modal data of the damaged structure were used to identify the extent of the damages. This was based on comparing the changes of stiffness parameters identified from the undamaged and the damaged structure. With the identified parameters, the FE model was able to reproduce the experimental data as close as possible and allowed the identification of the extent of the damage. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
