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Image of Vibration Testing and System Dynamics
ISSN: 2475-4811 (print)
ISSN: 2475-482X (online)
Journal of Vibration Testing and System Dynamics

C. Steve Suh (editor), Pawel Olejnik (editor),

Xianguo Tuo (editor)

Pawel Olejnik (editor)

Lodz University of Technology, Poland

Email: pawel.olejnik@p.lodz.pl

C. Steve Suh (editor)

Texas A&M University, USA

Email: ssuh@tamu.edu

Xiangguo Tuo (editor)

Sichuan University of Science and Engineering, China

Email: tuoxianguo@suse.edu.cn

Experimental Validation of Damage Detection based on Member Axial-strain Mode Shapes for Truss Structures

Journal of Vcibration Testing and System Dynamics 2(4) (2018) 403--416 | DOI:10.5890/JVTSD.2018.12.005

Guirong Yan$^{1}$, Shirley J. Dyke, Ayhan Irfanoglu

$^{1}$ Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA

$^{2}$ School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA

$^{3}$ School of Civil Engineering, Purdue University, West Lafayette, IN 47907, USA

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Abstract

In this study, a simple, effective damage detection approach is proposed for truss structures to locate damage onto exact member(s) using vibration responses. First, a parameter that reflects the axial strain in truss members and is sensitive to local damage is proposed. This parameter is called the member axial-strain mode shape and can be extracted from the translational mode shapes. Each component in an member axial-strain mode shape is associated with a member, reflecting the axial strain in that member. Because damage to a member directly affects the axial strain in that member, the proposed member axial-strain mode shape is an effective parameter for evaluating the condition of truss members. Second, a damage indicator constructed by both member axial- strain mode shapes and natural frequencies are proposed. Experimental tests are conducted on a full-scale sign support truss to demonstrate the effectiveness of the proposed approach. The results illustrate that the proposed approach can be applied to truss structures instrumented with a few accelerometers and using only response data.

Acknowledgments

The authors greatly appreciate the financial support from National Science Foundation under Grant Nos. 1002641 and 1455709. The authors would also like to thank Prof. Robert Connor at Purdue University and Mr. Michael Todsen at the Iowa Department of Transportation for helping them acquire the sign support truss used in this study.

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