Detection Indicator of Structural Nondestructive Damage Based on Flexibility Curvature Difference Rate

Abstract:

Applied to the structural damage identification, Modal Flexibility is better than the Modal Frequency and Modal Displacement, the indicators of Flexibility Curvature are effective and sensitive. This paper proposes a new detection indicator which is Flexibility Curvature Difference Rate (FCDR) that by using the change rate of diagonal elements of flexibility curvature difference when before and after damage. The numerical examples of a simple beam, a continuous beam and a frame with the damage conditions of the different positions and different degrees are used to verify FCDR. The result shows that FCDR can well identify the numerical examples damages, and sensitively diagnose the damage near the supports of beam and the nodes of framework.

• Periodical: Applied Mechanics and Materials (Volumes 744-746)
• Pages: 46-52
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.744-746.46
• Online since: March 2015
• Authors: Chang Sheng Xiang*, Yu Zhou, Sheng Kui Di, Li Xian Wang, Jian Shu Cheng
• Keywords: Curvature Difference Rate, Damage Orientation, Detection Indicator, Flexibility Matrix, Numerical Simulation Examples

References

[1] RayW. Clough, Joseph Penzien. Dynamics of Structures [M]. Beijing: Higher Education Press, (2006).

[2] Pandey A K, Biswas M, Samman M M. Damage detection from changes in curvature mode shapes [J]. Journal of Sound and Vibration, 1991, 145: 321~332.

DOI: 10.1016/0022-460x(91)90595-b

[3] Toksoy T, Aktan A E. Bridge-condition assessment by modal flexibility [J]. Experimental Mechanics, 1994, 34: 271-278.

DOI: 10.1007/bf02319765

[4] Doebling SW, Farrar CR, Prime MB, Shevitz DW. Damage identification and health monitoring of structural and mechanical systems from changes in their vibration characteristics: a literature review. Report no. LA-13070-MS, Los Alamos National Laboratory, Los Alamos (USA); 1996. 2: 1114~1116.

DOI: 10.2172/249299

[5] Raggavendrachar M, Aktan A E. Flexibility by multi-reference impact testing for bridge diagnostics [J]. Journal of Structural Engineering, 1992, 118(8): 2186-2203.

DOI: 10.1061/(asce)0733-9445(1992)118:8(2186)

[6] Zhao J, DeWolf J T. Sensitivity study for vibrational parameters used in damage detection [J]. Journal of Structural Engineering, 1999, 125(4): 410-416.

DOI: 10.1061/(asce)0733-9445(1999)125:4(410)

[7] Zhang Z & Aktan A E. The damage indices for the constructed facilities [C]. Proc. 13th Int. Modal Analysis Conf. 1995. 2: 1520~1529.

[8] Hui Cao, Michael I Friswell. Nondestructive damage evaluation indicator based on modal flexibility curvature [J]. Engineering Mechanics, 2006, 24(4): 33-38. (in Chinese).

[9] Hui Cao, Xinliang Zhang, Yingmin Li. Identify frame damage based on the modal flexibility curvature difference [J]. Journal of Vibration and Shock, 2007, 26(6): 116-120. (in Chinese).

[10] Yongmei Li, Xiyuan Zhou, Xiangyu Gao. Detection indicator of structural non-destructive damage based on curvature-flexibility difference matrix [J]. Engineer Mechanics, 2009, 26 (2): 188-195. (in Chinese).

[11] Yongmei Li, Xiyuan Zhou, Xiangyu Gao, et al. Damage diagnosis of beam structures by flexibility curvature method [J]. Journal of Beijing University of Technology, 2008, 34 (11): 1173-1178. (in Chinese).

[12] Pandey A K, Biswas M. Damage detection in structures using changes in flexibility [J]. Journal of Sound and Vibration, 1994, 169: 3~17.

DOI: 10.1006/jsvi.1994.1002