A damage detection approach based on the distribution of constraint forces predicted from measured flexural strain

초록

Changes in flexural strain are good indicators for locating damage in structures. Despite such promise, flexural strain data measured at a few positions do not provide enough information to detect damage. However, they do become more effective if converted to vertical deflection data. Considering the relationship between measured flexural strain and vertical deflection as a constraint, this work provides a method to detect damage based on the distribution of flexural curvatures and constraint forces along a structural beam-member. The constraint forces are forces required for describing the flexural shape of the damaged beam under static and dynamic loadings. It is illustrated in two applications that the proposed constraint force method is more effective than the displacement curvature method in detecting multiple areas of low-level damage and when considering noisy measured data.

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