An Approach on Damage Detection of Beams Using Operational and Numerical Modal Analyses

Volume 39, Issue 4 (July 2011)

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ISSN: 1945-7553
CODEN: JTEVAB
Published Online: 20 January 2011
Page Count: 8

An Approach on Damage Detection of Beams Using Operational and Numerical Modal Analyses

Türker, Temel
Research Assistant, Dept. of Civil Engineering, Karadeniz Technical Univ., Trabzon,

Bayraktar, Alemdar
Professor, Dept. of Civil Engineering, Karadeniz Technical Univ., Trabzon,

(Received 9 March 2010; accepted 15 December 2010)

Abstract

The study presents an application of a damage detection approach for beam like structures that is based on both operational and numerical modal analyses results obtained from undamaged and damaged cases of a structure. The effectiveness of this approach is assessed by performing investigations on a column model. In the first step of this approach, the damaged member of the column is determined by comparing the mode shapes of the undamaged and damaged cases. For this purpose, the changes on the vectors defined as the differences between the undamaged and damaged mode shapes for each mode are observed. It is assumed that the abrupt change in these vectors shows the existence of the damage. In the second step, the numerical model of the column is created and calibrated according to the experimental results obtained from the undamaged case. To find the damaged section, a step-by-step analysis on the pre-identified member of the column model is performed numerically. For this reason, the natural frequencies obtained from the numerical modal analyses of the column for the damaged case are compared with the experimental results. The minimum difference between the numerical and experimental results indicates the presence of the damage on this section. The approach used in this study provides an important contribution that the number of structural members to be analyzed is limited instead of analyzing all structural members.

Keywords:
damage detection, modal analysis, mode shapes, natural frequencies, operational modal analysis

Paper ID: JTE103073
DOI: 10.1520/JTE103073
ASTM International is a member of CrossRef.

Author Title An Approach on Damage Detection of Beams Using Operational and Numerical Modal Analyses Symposium , 0000-00-00 Committee E07

		SEDL / Journals / Journal of Testing and Evaluation (JTE) / Citation Page Volume 39, Issue 4 (July 2011) Click here to download this paper now for $25 PDF (284K) View License Agreement ISSN: 1945-7553 CODEN: JTEVAB Published Online: 20 January 2011 Page Count: 8 An Approach on Damage Detection of Beams Using Operational and Numerical Modal Analyses Türker, Temel Research Assistant, Dept. of Civil Engineering, Karadeniz Technical Univ., Trabzon, Bayraktar, Alemdar Professor, Dept. of Civil Engineering, Karadeniz Technical Univ., Trabzon, (Received 9 March 2010; accepted 15 December 2010) Abstract The study presents an application of a damage detection approach for beam like structures that is based on both operational and numerical modal analyses results obtained from undamaged and damaged cases of a structure. The effectiveness of this approach is assessed by performing investigations on a column model. In the first step of this approach, the damaged member of the column is determined by comparing the mode shapes of the undamaged and damaged cases. For this purpose, the changes on the vectors defined as the differences between the undamaged and damaged mode shapes for each mode are observed. It is assumed that the abrupt change in these vectors shows the existence of the damage. In the second step, the numerical model of the column is created and calibrated according to the experimental results obtained from the undamaged case. To find the damaged section, a step-by-step analysis on the pre-identified member of the column model is performed numerically. For this reason, the natural frequencies obtained from the numerical modal analyses of the column for the damaged case are compared with the experimental results. The minimum difference between the numerical and experimental results indicates the presence of the damage on this section. The approach used in this study provides an important contribution that the number of structural members to be analyzed is limited instead of analyzing all structural members. Keywords: damage detection, modal analysis, mode shapes, natural frequencies, operational modal analysis Paper ID: JTE103073 DOI: 10.1520/JTE103073 ASTM International is a member of CrossRef. Author Title An Approach on Damage Detection of Beams Using Operational and Numerical Modal Analyses Symposium , 0000-00-00 Committee E07