Novel method for identifying residual prestress force in simply supported concrete girder-bridges

Testing methods are required for estimating prestress losses in Prestressed Concrete (PC) girder-bridges. They mainly include destructive approaches which cause significant damages. Conversely, dynamic nondestructive unsuitable. Given these findings, a novel method identifying residual force simply supported PC girder-bridges was implemented. Following the vertical load application three-point bending, estimates by measuring deflection at quarter or, alternatively, midspan of girder-bridge. The also requires information regarding its flexural rigidity. Particularly, initial tangent Young’s modulus must be evaluated compression tests on cores drilled and cross-sections after bending. In absence geometric and/or material properties, rigidity can estimated according to free vibrations. Secondly, comprises reference solution, or finite element model girder-bridge, is unknown. Thirdly, measured becomes parameter identification process. Accurate identifications obtained when deflection, under higher load, precisely determined using solution modulus. this article, simulated beam-bridge subjected time-dependent ≈9.5 months laboratory.