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Metody oceny pełzania betonu w mostowych konstrukcjach sprężonych
DOI:
https://doi.org/10.24425/ace.2025.155105Abstrakt
W referacie omówiono zjawisko pełzania betonu, jego modele mechaniczne oraz uproszczone i bardziej wyrafinowane sposoby szacowania efektów pełzania stosowane w projektowaniu konstrukcji mostowych. W części dotyczącej metod uproszczonych opisano metodę – efektywnego modułu sprężystości oraz metody współczynnika korekcyjnego Ccreep stosowane w przypadku przęseł z belek prefabrykowanych. Spośród dokładnych metod przedstawiono m.in. metodę zmodyfikowanego efektywnego modułu sprężystości (Trost 1967), metodę efektywnego modułu sprężystości betonu dostosowanego do wieku jego obciążenia (Bažant 1972) oraz metodę przyrostową według liniowej teorii sprężystości. Scharakteryzowano metody obliczeniowego ujęcia pełzania według aktualnych przepisów PN-EN, wycofanych norm polskich oraz w zaleceniach i literaturze zagranicznej. Zaprezentowano wpływ pełzania na redystrybucję sił wewnętrznych przy etapowym wznoszeniu ustroju na przykładzie wiaduktu z belek prefabrykowanych i mostu budowanego metodą betonowania nawisowego. Zwrócono uwagę na możliwości rozszerzenia opisu zagadnień pełzania w betonowych konstrukcjach mostowych przy użyciu aparatu pojęciowego pochodnych ułamkowego rzędu.Bibliografia
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