Research on Two-Step Damage Detection Method for Complex Gird Truss Structure under Wind Load

Abstract:

Considering characteristics of gird truss structure, the suitable two-step damage detection method for these structures is proposed in the paper. The acceleration power spectral density sensibility of structural nodes is obtained by analyzing their acceleration power spectral density value caused every damaged structural bar. According to sensibility value, the range of influence of damaged structural bar is determined, then structural sub regions are divided and accelerators are distributed. The first step damage detection methods is identifying damaged bar occurrence region, it is extracting damage index to identify the damage occurrence region based on changes of acceleration response power spectral density of structure damaged after and before. The second step damage detection methods is located damaged bar in the region, it is completed by finding the damaged bar based on the theory of dissipation ratio of modal strain energy damage detection method. At last, taking the gird truss structure as numerical example, it shows the method has the capability to detect the damage of complex gird truss structures successfully.

• Periodical: Applied Mechanics and Materials (Volumes 256-259)
• Pages: 1131-1138
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.256-259.1131
• Online since: December 2012
• Authors: Hui Liu*, Xue Liang Wang, Wei Lian Qu
• Keywords: Acceleration Response Power Spectral Density, Damage Detection, Gird Truss Structure, Modal Strain Energy

References

[1] S.X. Wang and Zh. Jiang: Present Developing Situation and Research Advances in the Field of Structural Damage Detection. Journal of Vibration and Shock, Vol. 23(2004), pp.99-102(In Chinese).

[2] K. Worden, G. Manson and D. Allman: Experimental Validation of a Structural Health Monitoring Methodology: Part I. Novelty Detection on a Laboratory Structure. Journal of Sound and Vibration, Vol. 259(2003), pp.323-343.

DOI: 10.1006/jsvi.2002.5168

[3] H.P. Zhu and B. Li: Comparison of Analytical Approaches to Structural Damage Detection Based on Measured Dynamic Characteristics. Journal of Wuhan Urban Construction Institute, Vol. 19(2002), pp.48-53(In Chinese).

[4] Y.M. Li, X.Y. Gao and Y. Sh. Shi: Damage Diagnosis of Space Truss Based on Change of Elemental Strain Modal. Journal of Building Structures, Vol. 30(2009), pp.152-159(In Chinese).

[5] S. Beskhyroun and T. Oshima: A Numerical Analysis of Structural Damage Detection Using Changes in the Curvature of Power Spectral Density. Journal Structural Engineering, Vol. 51A(2005), pp.38-49.

[6] S. Beskhyroun, T. Oshima, S. Mikami and T. Yamazaki: Damage detection and localization on structural connections using vibration-based damage identification methods. Journal of Applied Mechanics, Vol. 6(2003), pp.1055-1064.

DOI: 10.2208/journalam.6.1055

[7] Y.B. Li, Sh. Xing and T. Oshima: Damage Detection of Steel Bridge Based on Acceleration Power Spectral Density. Journal of Experimental Mechanics, Vol. 24(2009), pp.598-604(In Chinese).

[8] H. Liu, W.L. Qu and R. Zh. Yuan: Structural Damage Detection Method Based on the Theory of Dissipation Ratio of Modal Strain Energy. Journal of Vibration and Shock, Vol. 23(2004), pp.118-121(In Chinese).