Hiesch, Dominik ; Proske, Tilo ; Graubner, Carl‐Alexander ; Bujotzek, Lukas ; El Ghadioui, Redouan (2023)
Theoretical and experimental investigation of the time‐dependent relaxation rates of GFRP and BFRP reinforcement bars.
In: Structural Concrete : Journal of the FIB, 2023, 24 (2)
doi: 10.26083/tuprints-00024307
Artikel, Zweitveröffentlichung, Verlagsversion
Kurzbeschreibung (Abstract)
Cracked concrete members with fiber‐reinforced polymer (FRP) reinforcement generally suffer from increased deflections compared to steel‐reinforced members due to FRP reinforcements' lower modulus of elasticity. An approach to counteract this problem can be the prestressing of the FRP reinforcement, which can significantly reduce member deflections. However, time‐dependent prestress losses occur due creep and shrinkage of the concrete and relaxation of the prestressing tendons. Within the first part of this article, mathematical approaches to determine relaxation rates from creep tests are introduced. Subsequently, short‐term and long‐term tensile tests under sustained load on glass and basalt FRP reinforcement bars are presented. Based on the experimental data and the mathematical model, relaxation rates for the investigated specimens are derived. In addition, using an approach based on logarithmic extrapolation, the relaxation rates at 1 million hours (end of service life) are calculated, and the experimentally determined residual tensile properties are evaluated.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Hiesch, Dominik ; Proske, Tilo ; Graubner, Carl‐Alexander ; Bujotzek, Lukas ; El Ghadioui, Redouan |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Theoretical and experimental investigation of the time‐dependent relaxation rates of GFRP and BFRP reinforcement bars |
| Sprache: | Englisch |
| Publikationsjahr: | 2023 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 2023 |
| Verlag: | John Wiley & Sons |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Structural Concrete : Journal of the FIB |
| Jahrgang/Volume einer Zeitschrift: | 24 |
| (Heft-)Nummer: | 2 |
| DOI: | 10.26083/tuprints-00024307 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/24307 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| Kurzbeschreibung (Abstract): | Cracked concrete members with fiber‐reinforced polymer (FRP) reinforcement generally suffer from increased deflections compared to steel‐reinforced members due to FRP reinforcements' lower modulus of elasticity. An approach to counteract this problem can be the prestressing of the FRP reinforcement, which can significantly reduce member deflections. However, time‐dependent prestress losses occur due creep and shrinkage of the concrete and relaxation of the prestressing tendons. Within the first part of this article, mathematical approaches to determine relaxation rates from creep tests are introduced. Subsequently, short‐term and long‐term tensile tests under sustained load on glass and basalt FRP reinforcement bars are presented. Based on the experimental data and the mathematical model, relaxation rates for the investigated specimens are derived. In addition, using an approach based on logarithmic extrapolation, the relaxation rates at 1 million hours (end of service life) are calculated, and the experimentally determined residual tensile properties are evaluated. |
| Freie Schlagworte: | concrete, creep, fiber‐reinforced polymer, FRP, prestress, relaxation |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-243078 |
| Zusätzliche Informationen: | Special Theme: Sustainability of Concrete Structures |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 624 Ingenieurbau und Umwelttechnik |
| Fachbereich(e)/-gebiet(e): | 13 Fachbereich Bau- und Umweltingenieurwissenschaften 13 Fachbereich Bau- und Umweltingenieurwissenschaften > Institut für Massivbau |
| Hinterlegungsdatum: | 04 Aug 2023 12:25 |
| Letzte Änderung: | 07 Aug 2023 07:06 |
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| Zugehörige Links: | |
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