Stiffness reduction index for detection of damage location: Analytical study

Fayyadh, M.M. and Razak, H.A. (2011) Stiffness reduction index for detection of damage location: Analytical study. International Journal of Physical Sciences, 6 (9). pp. 2194-2204. ISSN 19921950,

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A new damage location index is developed and presented in this paper. The new index is based on the combined mode shape vector and its derivatives to overcome the problem of inaccuracy and insensitivity of existing indices to locate damage in a beam-like structure model. The proposed new index called the stiffness reduction index (SRI) is computed based on the change in eigenvectors and its curvature at each element and for individual mode shapes. In order to assess the validity of the new index, comparisons with an existing algorithm, that is, the co-ordinate model assurance criteria (COMAC) were undertaken using modal data from a finite element model. The study has adopted the first four bending modes to examine the sensitivity of both existing as well as developed damage location indices. The study has examined the new damage index for very small damage intensity, which has been presented by reducing the modulus of elasticity at certain elements along the beam length by only 1. The results obtained from this study revealed higher and better sensitivity of the developed index to detect a low damage intensity and at different locations along the length of the beam. The study has validated the new index to detect the damage location for the case of multi damage location presented at the same time along the beam length. In addition, the index is more adept and managed to resolve the inadequacies of the COMAC index. © 2011 Academic Journals.

Item Type: Article
Additional Information: Cited By (since 1996):7 Export Date: 16 December 2013 Source: Scopus Language of Original Document: English Correspondence Address: Fayyadh, M. M.; Department of Civil Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia; email: References: Choi, F.C., Li, J., Samali, B., Crews, K., Application of the Modified Index Method to Timber Beams (2008) J. Eng. Struct, 30, pp. 1124-1145; Dutta, A., Talukdar, S., Damage Detection in Bridges Using Accurate Modal Parameters (2004) J. Finite Elem. Anal. Des, 40, pp. 287-304; Ismail, Z., Abdul Razak, H., Determination of Damage Location In R.C. Beams Using Mode Shape Derivatives (2006) J. Eng. Struct, 28, pp. 1566-1573; Johan, M., (2003) Damage Assessment of Civil Engineering Structures By Vibration Monitoring, , Katholieke University Leuven, Faculteit toegepaste Wetenschappen, Arenbergkastell, B-3001 Heverlee (Belgium), ISBN 90-5682-390-6; Kim, J.T., Park, J.H., Hong, D.S., Park, W.S., Hybrid health monitoring of prestressed concrete girder bridges by sequential vibrationimpedance approaches (2010) Eng. Struct, 32 (1), pp. 115-128; Kopsaftopoulos, F.P., Fassois, S.D., Vibration based health monitoring for a lightweight truss structure: Experimental assessment of several statistical time series methods (2010) Mech. Syst. Signal Process, 24, pp. 1977-1997; Law, S.S., Lu, Z.R., Crack Identification in Beam from Dynamic Response (2005) J. Sound Vib, 285, pp. 967-987; Pandey, A.K., Biswas, M., Samman, M.M., Damage Detection from Change in Curvature Mode Shapes (1991) J. Sound Vib, 145 (2), pp. 321-332; Perera, R., Huerta, C., Orquin, J.M., Identification of damage in RC beams using index based on local modal stiffness (2008) Constr. Build. Mater, 22, pp. 1659-1667; Peterson, S.T., McLean, D.I., Symans, M.D., Pollock, D.J., Coder, W.F., Emerson, R.N., Fridley, K.J., Application of Dynamic System Identification to Timber Beam (2001) ASCE J. Struct. Eng, 127 (4), pp. 418-425; Ratcliffe, C.P., Damage Detection Using A Modified Laplacian Operator On Mode Shape Data (1997) J. Sound Vib, 204 (3), pp. 505-517; Rodríguez, R., Escobar, J.A., Gómez, R., Damage detection in instrumented structures without baseline modal parameters (2010) Eng. Struct, 32 (6), pp. 1715-1722; Stubbs, N., Kim, J., Field Verification of Non Destructive Damage Location and Severity Estimation Algorithm (1995) Processing of the 13th International Modal Analysis Conference, pp. 210-218; Wahab, M.M.A., Roeck, G.D., Damage Detection in Bridges Using Modal curvature: Application To A Real Damage Scenario (1999) J. Sound Vib, 226, pp. 217-235; Yan, G., Duan, Z., Ou, J., de Stefano, A., Structural damage detection using residual forces based on wavelet transform (2010) Mech. Syst. Signal Process, 24 (1), pp. 224-239
Uncontrolled Keywords: Co-ordinate modal assurance criteria, Damage location indices, Stiffness reduction index, Stiffness reduction ratio,
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 24 Jan 2014 15:25
Last Modified: 21 Dec 2014 09:33

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