Shear capacity of the interface between concretes cast at different time in the light of experimental investigations and codes of practice

• Autorzy: Gołdyn Michał

Identyfikatory

DOI

10.24425/ace.2022.140168

Warianty tytułu

PL

Nośność styków pomiędzy betonami układanymi w różnym czasie w świetle wyników badań eksperymentalnych i procedur projektowych

• Języki publikacji: EN

Abstrakty

EN

The paper presents selected issues related to the load carrying capacity of joints between concretes cast at different times. The most important factors affecting the shear resistance, such as: surface roughness (profile), shear reinforcement ratio, concrete strength as well as the aggregate composition are discussed, including results of previous experimental studies conducted on push-off specimens and composite reinforced concrete beams. The differences in behaviour and shear resistance of contacts between ordinary concretes, lightweight aggregate concretes and recycled aggregate concretes are presented. Principles of interface design in the light of codes of practise: AASHTO-LRFD, ACI 318-19, EN 1992-1-1 and prEN 1992-1-1 were described. The theoretical predictions were compared with 184 results of experimental tests on push-off specimens. It has been found that most of the procedures allow for a safe estimation of the load carrying capacity of interfaces - with and without shear reinforcement. However, the obtained results were mostly conservative (depending on the considered design procedure, ratio of the experimental to theoretical load carrying capacity lies in range 1.51÷2.68). This may indicate that the description of shear transfer mechanism between concretes cast at different times is still imperfect and need to be improved.

PL

W artykule przedstawiono wybrane zagadnienia związane z nośnością styków pomiędzy betonami układanymi w różnym czasie. Konieczność zapewnienia właściwego zespolenia pomiędzy “starym” i “nowym” betonem zachodzi nie tylko w przypadku konstrukcji nowo wznoszonych, w których stosuje się elementy prefabrykowane, lecz także w obiektach już istniejących, gdy zachodzi potrzeba wzmocnienia konstrukcji. Tematyka nośności styków pomiędzy betonami układanymi w różnym czasie stanowi przedmiot badań eksperymentalnych prowadzonych od lat 60. ubiegłego wieku. Za pierwszy model opisujący zachowanie styków uznaje się teorię shear-friction, przedstawioną przez Masta i opisaną szczegółowo przez Birkelanda i Birkelanda. Model ten stosowany jest do dnia dzisiejszego w procedurach obliczeniowych ACI 318 i AASHTO-LRFD, jednak badania eksperymentalne prowadzone na przestrzeni lat wykazały potrzebę rewizji przyjętych założeń, polegających m.in. na uwzględnieniu sił adhezji czy kompozycji stosu okruchowego.

Słowa kluczowe

EN

shear capacity; shear-friction; push-off test; concrete interface; concrete cast; different time; overlay

PL

wytrzymałość na ścinanie; naprężenie graniczne; tarcie ścinające; badanie push-off; styk; warstwa betonu; czas różny; nadbeton

• Wydawca: Komitet Inżynierii Lądowej i Wodnej PAN ; Politechnika Warszawska, Wydział Inżynierii Lądowej
• Czasopismo: Archives of Civil Engineering
• Rocznik: 2022
• Tom: Vol. 68, nr 1
• Strony: 275--298
• Opis fizyczny: Bibliogr. 48 poz., il., tab.

Twórcy

autor

Gołdyn Michał

• Lodz University of Technology, Department of Concrete Structures, Łódź, Poland

• https://orcid.org/0000-0002-7791-1940

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).