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 methods are unsuitable. Given these findings, a novel method for identifying residual prestress force in simply supported PC girder-bridges was implemented. Following the vertical load application in a three-point bending, the method estimates the prestress force by measuring the vertical deflection at a quarter or, alternatively, at the midspan of the PC girder-bridge. The method also requires information regarding its flexural rigidity. Particularly, the initial tangent Young’s modulus must be evaluated by compression tests on cores drilled at its quarter and midspan cross-sections after three-point bending. In absence of the geometric and/or material properties, the flexural rigidity can be estimated according to free vibrations. Secondly, the method comprises a reference solution, or a finite element model of the PC girder-bridge, in which the prestress force is unknown. Thirdly, the measured deflection becomes a parameter of the prestress force identification process. Accurate identifications are obtained when the deflection, under a higher vertical load, was precisely measured and the flexural rigidity was determined using reference solution and initial tangent Young’s modulus. In this article, the novel method was simulated on a simply supported PC beam-bridge subjected to time-dependent prestress losses for ˜9.5 months in the laboratory.
- Record URL:
-
Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/13694332
-
Supplemental Notes:
- © The Author(s) 2021.
-
Authors:
- Bonopera, Marco
-
0000-0003-3819-2389
- Chang, Kuo-Chun
- Publication Date: 2021-10
Language
- English
Media Info
- Media Type: Web
- Features: References;
- Pagination: pp 3238-3251
-
Serial:
- Advances in Structural Engineering
- Volume: 24
- Issue Number: 14
- Publisher: Sage Publications, Incorporated
- ISSN: 1369-4332
- Serial URL: http://journals.sagepub.com/home/ase
Subject/Index Terms
- TRT Terms: Deflection; Girder bridges; Nondestructive tests; Prestressed concrete
- Subject Areas: Bridges and other structures; Highways; Maintenance and Preservation;
Filing Info
- Accession Number: 01778717
- Record Type: Publication
- Files: TRIS
- Created Date: Aug 5 2021 9:20AM