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Computers and Concrete
  Volume 5, Number 1, February 2008, pages 37-60

Identification of reinforced concrete beam-like structures subjected to distributed damage from experimental static measurements
N. Lakshmanan, B. K. Raghuprasad, K. Muthumani, N. Gopalakrishnan and D. Basu

    Structural health monitoring of existing infrastructure is currently an important field of research, where elaborate experimental programs and advanced analytical methods are used in identifying the current state of health of critical and important structures. The paper outlines two methods of system identification of beam-like reinforced concrete structures representing bridges, through static measure- ments, in a distributed damage scenario. The first one is similar to the stiffness method, re-cast and the second one to flexibility method. A least square error (LSE) based solution method is used for the estimation of flexural rigidities and damages of simply supported, cantilever and propped cantilever beam from the measured deformation values. The performance of both methods in the presence of measurement errors is demonstrated. An experiment on an un-symmetrically damaged simply supported reinforced concrete beam is used to validate the developed method. A method for damage prognosis is demonstrated using a generalized, indeterminate, propped cantilever beam.
Key Words
    damage identification; beam-like structures; bridges; static measurements.
N. Lakshmanan; Structural Engineering Research Centre, CSIR Campus, Taramani, Chennai 600113, India
B. K. Raghuprasad; Department of Civil Engineering, Indian Institute of Science, Bangalore 560012, India
K. Muthumani, N. Gopalakrishnan and D. Basu; Structural Engineering Research Centre, CSIR Campus, Taramani, Chennai 600113, India

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