https://scholars.lib.ntu.edu.tw/handle/123456789/598542
Title: | Novel method for identifying residual prestress force in simply supported concrete girder-bridges | Authors: | Bonopera M Chang K.-C. KUO-CHUN CHANG |
Keywords: | Concrete beam-bridge;flexural rigidity;prestress force identification;three-point bending;vertical deflection;Bending dies;Bending tests;Compression testing;Prestressed beams and girders;Prestressed concrete;Rigidity;Flexural rigidities;Nondestructive methods;Prestress forces;Reference solution;Residual prestress;Simply supported;Three point bending;Vertical deflections;Concrete beams and girders | Issue Date: | 2021 | Journal Volume: | 24 | Journal Issue: | 14 | Start page/Pages: | 3238-3251 | Source: | Advances in Structural Engineering | Abstract: | 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. ? The Author(s) 2021. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85110087127&doi=10.1177%2f13694332211022067&partnerID=40&md5=28e04725f9d2c7061e0e10052e1017ec https://scholars.lib.ntu.edu.tw/handle/123456789/598542 |
ISSN: | 13694332 | DOI: | 10.1177/13694332211022067 |
Appears in Collections: | 土木工程學系 |
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