Transmission length test for prestressing cable after loss of mechanical anchorage / Rafał Walczak ; supervisor Wit Derkowski // W: Proceedings of the 2020 session of the 13th fib International PhD-Symposium ... więcej

Transmission length test for prestressing cable after loss of mechanical anchorage / Rafał Walczak ; supervisor Wit Derkowski // W: Proceedings of the 2020 session of the 13th fib International PhD-Symposium In Civil Engineering, Paris, France, August 26-28, 2020 [Dokument elektroniczny] / ed. by Fabrice Gatuingt, Jean-Michel Torrenti. – Paris : International Federation for Structural Concrete, 2020. – (fib Symposium Proceedings, ISSN 2617-4820). – S. 304-311 : fot., rys., tab., wykr. – Tryb dostępu: https://phdsymp2020.sciencesconf.org/data/pages/Proceedings_phdsymp_2021.pdf. – Bibliogr. 5 poz., Abstr. – ISBN 978-2-940643-06-6

The test of transmission length for a prestressing cable in case of loss of its mechanical anchorage is presented in the paper. In order to determine the work of the prestressing cable in the case of anchorage ... więcej

The test of transmission length for a prestressing cable in case of loss of its mechanical anchorage is presented in the paper. In order to determine the work of the prestressing cable in the case of anchorage failure, a controlled cut-off of the prestressing cable located in the upper flange of the member was conducted. The test was carried out on the precast post-tensioned concrete crane beam that was operated for over 50 years. During the test, the strain variation was recorded using four methods: electrofusion strain gauges, DIC, DOFS, and High-frequency DOFS. The test results indicate that after losing the cable anchorage, the prestressing force is transmitted through the bond of the prestressing wires to the cement grout, providing that the injection was done properly and the prestressing wires are tightly wrapped. The article also highlights the problem of the partial filling of the cable ducts.