Methods of assessing concrete creep in prestressed bridge structures

• Autorzy: Nowak Krzysztof , Oleszek Radosław , Zbiciak Artur

Identyfikatory

DOI

10.24425/ace.2025.155105

Warianty tytułu

PL

Metody oceny pełzania betonu w mostowych konstrukcjach sprężonych

• Języki publikacji: EN

Abstrakty

EN

The paper discusses the phenomenon of concrete creep, its mechanical models and simplified as well as more sophisticated methods of estimating creep effects applied in the design of bridge structures. The section on simplified methods describes the metod of substitutive concrete elasticity modulus and the method of estimating creep effects with the correction factor Ccreep for spans with precast beams. Among the precise methods, it presents the modified effective modulus method (Trost 1967), age-adjusted effective modulus method (Bažant 1972) and the general incremental method according to the linear theory of elasticity. Methods for computationally accounting for creep according to current PN-EN standards, withdrawn Polish standards, and recommendations from foreign literature are characterized. The impact of creep on the redistribution of internal forces during the incremental erection of the structure was demonstrated using examples of a viaduct made of precast beams and a bridge constructed using balanced cantilever method. Attention was drawn to the possibilities of extending the description of creep phenomena in concrete bridge structures using the conceptual framework of fractional-order derivatives.

PL

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.

• Wydawca: Komitet Inżynierii Lądowej i Wodnej PAN ; Politechnika Warszawska, Wydział Inżynierii Lądowej
• Czasopismo: Archives of Civil Engineering
• Rocznik: 2025
• Tom: Vol. 71, nr 3
• Strony: 369--384
• Opis fizyczny: Bibliogr. 38 poz., il., tab.

Twórcy

autor

Nowak Krzysztof

• Warsaw University of Technology, Faculty of Civil Engineering, Warsaw, Poland

• https://orcid.org/0000-0003-4079-6579

autor

Oleszek Radosław

• Warsaw University of Technology, Faculty of Civil Engineering, Warsaw, Poland

• https://orcid.org/0000-0002-1036-329X

autor

Zbiciak Artur

• Warsaw University of Technology, Faculty of Civil Engineering, Warsaw, Poland

• https://orcid.org/0000-0001-8882-2938

Bibliografia

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