Problem of condition assesment of precast, posttensioned concrete crane beams in an extended period of use / Wit Derkowski, Rafał Walczak // W: Concrete – innovations in materials, design and structures ... więcej

Problem of condition assesment of precast, posttensioned concrete crane beams in an extended period of use / Wit Derkowski, Rafał Walczak // W: Concrete – innovations in materials, design and structures : proceedings of the fib Symposium 2019 held in Kraków, Poland 27-29 May 2019 [Dokument elektroniczny] / eds. W. Derkowski, P. Gwoździewicz, Ł. Hojdys, P. Krajewski, M. Pańtak. – [Kraków] : International Federation for Structural Concrete, 2019. – Pamięć USB. – (fib Symposium Proceedings, ISSN 2617-4820). – S. 1507-1514 : fot., rys., tab., wykr. – Bibliogr. s. 1514, Abstr. – Nazwa wydawcy wg cop. – ISBN 978-2-940643-00-4

Research on posttensioned, precast crane beams after more than 50 years of exploitation is presented in the paper. Despite not secured tendons’ anchorages from corrosion as well as the use of the low ... więcej

Research on posttensioned, precast crane beams after more than 50 years of exploitation is presented in the paper. Despite not secured tendons’ anchorages from corrosion as well as the use of the low amount of stirrups the beams are still successfully used in industrial facilities. The failure modes as well as results of the load, deflections, cracks width and strains measurements for tests in different static schemes are given. First stage of tests contain four beams 60 cm of height. In second stage, test were conducted on a beam 80 cm of height made of two precast segments. The role of the experiments in the decision-making process regarding further exploitation of the structure after the period of their designed durability is highlighted. © Federation Internationale du Beton (fib) - International Federation for Structural Concrete, 2019.