31 March 1998 Comparison of the experimental performance of post-tensioned beam superstructures
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Because of corrosion evidence, an aggressive environment and aging effects on a post tensioned beam substructure and its superstructure, a non destructive testing of a bridge was performed. The same kind of experimental work was carried out on another bridge of very similar structural characteristics but shorter lifetime. The experimental setup and testing procedures are described. Transducers of displacements and accelerometers were used to register the movements induced by static and dynamic loads on both superstructures. Results of field tests are presented in terms of maximum static and dynamic displacements, time histories and frequency functions. These latter are used to derive characteristic dynamic parameters of the superstructures and identify associated modal shapes. The experimental response of both bridges is compared. Mathematical models of the superstructures were prepared and calibrated with the results of the experimental testing program. Currently design live loads were applied on the calibrated models and their responses were evaluated and compared. From the analysis of the experimental and analytical work, a structural safety evaluation of the superstructures was done.
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Roberto Gomez, Roberto Gomez, David Muria-Vila, David Muria-Vila, Jose Alberto Escobar, Jose Alberto Escobar, Roberto Sanchez-Ramirez, Roberto Sanchez-Ramirez, } "Comparison of the experimental performance of post-tensioned beam superstructures", Proc. SPIE 3400, Structural Materials Technology III: An NDT Conference, (31 March 1998); doi: 10.1117/12.300082; https://doi.org/10.1117/12.300082

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