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18 August 2003 Corrosion damage evaluation of prestressed beams using an inverse wave propagation method
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Experimental corrosion damage and dynamic behavior of nine 3 meter concrete beams (15x15 cm cross section) pre-stressed with four strands (6-wire, 0.8 cm in diameter) were evaluated by visual inspection (crack morphology) and vibration testing. Corrosion was induced in the embedded strand under controlled conditions and different levels of degradation were achieved. The Sub-Domain Inverse Method (SDIM), which is a dynamic method based on the wave propagation analysis of impact loads, was used to evaluate the damage. Stiffness reductions were calculated using a non-corroded control beam for reference and to calibrate a FEM. SDIM results compared with modal analysis, show reasonable agreement for low damage levels, while for the high damage levels differences is found. From the modal analysis, it is observed that the fundamental frequency is primary affected by the pre-stressing load reduction and none effect is recorded due to the longitudinal cracks generated by the corroded strands. Results show that the SDIM is sensitive to both, pre-stress reduction and concrete cracking damage.
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Francisco Carrion, Andres Torres-Acosta, Juan A. Quintana, Greg Mullins, and Rajan Sen "Corrosion damage evaluation of prestressed beams using an inverse wave propagation method", Proc. SPIE 5057, Smart Structures and Materials 2003: Smart Systems and Nondestructive Evaluation for Civil Infrastructures, (18 August 2003);

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