Long-Term Characteristics of Prestressing Force in Post-Tensioned Structures Measured Using Smart Strands

Kim, Sang-Hyun; Park, Sung Yong; Jeon, Se-Jin

doi:10.3390/app10124084

Cited by 12 publications

(6 citation statements)

References 31 publications

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“…This is possible because of the effect of time dependent shortening on the cable. The creep condition is less likely to occur considering the ambient temperature when testing at normal temperatures [22].…”

Section: Cable Stay Takes a Long Time To Return To An Undeformed Statementioning

confidence: 99%

Static and Dynamic Testing of Sei Dareh Cable-Stayed Bridge West Sumatera, Indonesia

Ramdhani

2024

Preprint

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The Sei Dareh Bridge is a cable-stayed bridge located in West Sumatra Province, Indonesia. The bridge, which crosses the Batanghari River, has a main span of 123 meters long and 9 meters wide. Traffic load is transmitted through 24 prestressed cables to a 42.4-meter-high pylon made of concrete. The bridge deck and traffic loads are directly supported by steel box girders as main beams that are reinforced laterally with cross beams IWF 800.300.16.24 and stringers IWF 350.350.12.19. This paper discusses static and dynamic testing on the bridge which aims to assess its feasibility before it is opened to the public. Based on the test, it was concluded that a static load of 73% could not be achieved because the deflection that occurred was beyond the allowable deflection. This is exacerbated by a loud clanging sound on the ST2-X1 prestressed cable when loading to 240 tons or 58% of the targeted load. In addition, this bridge is included in the "lazy bridge" category because it takes 24 hours to return to an undeformed condition after loading. As a recommendation for this bridge, it is necessary to carry out a structural health monitoring system (SHMS) regularly on bridge slabs and cables.

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Section: Cable Stay Takes a Long Time To Return To An Undeformed Statementioning

confidence: 99%

Static and Dynamic Testing of Sei Dareh Cable-Stayed Bridge West Sumatera, Indonesia

Ramdhani

2024

Preprint

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“…This is possible because of the effect of time dependent shortening on steel which depends on time. The creep condition is less likely to occur considering the ambient temperature when testing at normal temperatures [10].…”

Section: The Cause Of the Explosion Soundmentioning

confidence: 99%

Static and Dynamic Testing of Sei Dareh Cable-Stayed Bridge West Sumatera, Indonesia

Sumargo¹,

Ramdhani²

2021

Preprint

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The Sei Dareh Bridge is a cable-stayed bridge located in West Sumatra Province, Indonesia. The bridge, has a main span of 123 meters length and 9 meters wide, crosses the Batanghari River. Traffic load is transmitted through 4 prestressed cables to a 42.4 meter high pylon made of concrete. Bridge deck and traffic loads are directly supported by steel box girders as main beams that are reinforced laterally with cross beams IWF 800.300.16.24 and stringers IWF 350.350.12.19. This paper discusses static and dynamic testing on the bridge which aims to assess the feasibility before it is opened for public. Based on the test, it was concluded that the 73% static load could not be achieved because the deflection that occurred was beyond the allowable deflection. This is exacerbated by the sound of a loud clanging sound on the ST2-X1 prestressed cable when loading to 240 tons or 58% of the targeted load. In addition, this bridge is included in the "lazy bridge" category because it takes 24 hours to return to an undeformed condition after loading. As a recommendation for this bridge, it is necessary to carry out a structural health monitoring system (SHMS) regularly on the vehicle floor and cables.

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“…In this regard, the optical fiber sensor has the inherent advantages of no additional installation, inherent stability, and strong anti-interference [5]. Kim et al [6] previously noticed fiber Bragg grating (FBG) coupling at the center of the central wire of a 7-wire steel strand, extended the range of FBG with polyamide recoating and casing, and then applied it to monitor the internal prestress loss of concrete I-beams with a span of 20 meters [7][8][9]. Jeon et al [10,11] investigated the temperature compensation of a smart steel strand and evaluated its friction resistance.…”

Section: Introductionmentioning

confidence: 99%

Application research on internal prestress monitoring of box girder based on FBG self-sensing steel strand

Zeng,

Zhu,

Liu

et al. 2024

Preprint

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Internal prestressing is an effective prestressing approach in the concrete box girder that ultimately plays a vital role in their construction. In practical engineering, accurate measurement and long-term monitoring are still challenging. FBG-based self-sensing steel strand (FSS) possesses the advantages of quasi-distributed monitoring of internal cable prestress and long-term stable monitoring. To examine its application in monitoring the internal prestressing of the actual box girder project, as well as to reveal the law of prestressing distribution and prestressing loss in the box girder, the self-sensing steel strand is appropriately experimented by using the cyclic tensile test. Precast and cast-in-place beams are then selected to examine the prestressing process and long-term prestressing monitoring of box girders with single-ended and double-ended tensioning processes. The results reveal that the linearity of FSS is 0.84%, the hysteresis is 0.75%, and the repeatability is 1.87%, which exhibits a good prestress monitoring performance. In the comparative application with the Elasto-Magnetic sensor and the reverse tension method, the instantaneous prestress monitoring results are basically consistent with the Elasto-Magnetic sensor. Due to the influence of the friction resistance of the anchorage, it is slightly lower than the measured value of the reverse tension method. Therefore, the FSS exhibits the accuracy of prestress monitoring and consistency of the actual box girder engineering application. In the monitoring of instantaneous prestress loss, such a loss at the tension end of the box girder mostly caused by the internal shrinkage of prestressed tendon, accounting for 81.3 % on average. The mid-span and the fixed end of the box girder, which experience tension under the single-ended tension conditions, are affected by friction and concrete compression loss. Therefore, reducing the amount of shrinkage of steel strands and adopting the double-ended tension method is still the key to reducing the instantaneous prestress loss. In the long-term prestress loss, the measured value exhibits a certain discontinuity. Compared to the theoretical value, the amount of prestress loss of the box girder tensioned at both ends is linearly positively correlated with the magnitude of applied effective prestress, and the amount of loss is negatively correlated with channel curvature.

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Long-Term Characteristics of Prestressing Force in Post-Tensioned Structures Measured Using Smart Strands

Cited by 12 publications

References 31 publications

Static and Dynamic Testing of Sei Dareh Cable-Stayed Bridge West Sumatera, Indonesia

Static and Dynamic Testing of Sei Dareh Cable-Stayed Bridge West Sumatera, Indonesia

Static and Dynamic Testing of Sei Dareh Cable-Stayed Bridge West Sumatera, Indonesia

Application research on internal prestress monitoring of box girder based on FBG self-sensing steel strand

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