Resumo

RIVEROS, Carlos Alberto; GARCIA, Edwin Fabián  e  BUILES, Manuel Alonso. A NUMERICAL APPROACH FOR FAULT DETECTION INBEAM-LIKE STRUCTURES USING MODAL STRAIN ENERGY. Rev.EIA.Esc.Ing.Antioq [online]. 2010, n.13, pp.171-184. ISSN 1794-1237.

Vibration-based damage detection is based on the fact that measurements of changes in the vibration propertiesof a structure can be used to determine the occurrence of structural damage. Therefore, there is a strong needfor the development and implementation of fault detection and optimum sensor location methods that addressthe issue of limited instrumentation and its effect in predicting damage degradation. In this paper, the results of anumerical implementation of a previously developed sensor distribution method are presented. A finite elementmodel of a railway box-girder bridge is assembled. Then, the damage index method is numerically implementedin order to identify damage from the resulting sensor measurements. Both the optimum sensor placement and thedamage detection methods are based on the concept of modal strain energy. Finally, the numerical results showthat the proposed approach is suitable for continuous damage monitoring implementations and can be used as auseful tool for damage assessment in beam-like structures.

Palavras-chave : structural health monitoring; fault detection; optimum sensor location; modal strain energy; sensitivity matrix; curvature of the vibration mode shape.

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