Bridge Monitoring with Harmonic Excitation and Principal Component Analysis

2018
Viet Ha Nguyen, Jean-Claude Golinval, Stefan Maas

Principal Component Analysis is used for damage detection in structures excited by harmonic forces. Time responses are directly analysed by Singular Value Decomposition to deduct two dominant Proper Orthogonal Values corresponding to two Proper Orthogonal Modes. Damage index is defined by the concept of subspace angle that a subspace is built from the two Proper Orthogonal Modes. A subspace angle reflects the coherence between two different structural health states. An example is given through the application on a part of a real prestressed concrete bridge in Luxembourg where different damage states were created by cutting a number of prestressed tendons in four scenarios with increasing levels. Results are better by using excitation frequency close to an eigenfrequency of the structure. The technique is convenient for practical application in operational bridge structures.

Keywords
bridge structure, damage detection, forced harmonic excitation, principal component analysis, subspace angle, time response
DOI
10.7250/bjrbe.2018-13.423

Nguyen, V., Golinval, J., Maas, S. Bridge Monitoring with Harmonic Excitation and Principal Component Analysis. The Baltic Journal of Road and Bridge Engineering, 2018, Vol. 13, No. 4, pp.374-384. ISSN 1822-427X. e-ISSN 1822-4288. Available from: doi:10.7250/bjrbe.2018-13.423

Publication language
English (en)