The analysis of load carrying capacity and cracking of slightly reinforced concrete members in bending

Marta Słowik


Department of Building Structures; Faculty of Civil Engineering and Architecture; Lublin University of Technology (Poland)
https://orcid.org/0000-0001-9627-3625

Abstract

Slightly reinforced concrete members are the members made by concrete with reinforcement less than minimum given in codes for reinforced concrete ones. Plain concrete and slightly reinforced concrete members in bending are treated in the same way during the dimensioning and the influence of longitudinal reinforcement on the load carrying capacity is not taken into account. The mechanism of work and crack formation in slightly reinforced concrete members is not completely recognized. The author’s own research program was made. The experiment was aimed at the determination of cracking moment and load carrying capacity of slightly reinforced concrete beams with different reinforcement ratio. Also plain concrete beams and the typical reinforced concrete beam were tested. The analysis of the obtained values of maximum bending moment and crack’s widths was made according to the reinforcement ratio. The analysis of test results shows how the presence of longitudinal steel bars in concrete members, even when reinforcement ratio is low, changes cracking process and influences the value of cracking moment in flexural members. On the basis of test results, the method how to calculate the load carrying capacity of slightly reinforced concrete elements in bending has been proposed.


Keywords:

slightly reinforced concrete, minimum reinforcement ratio, load carrying capacity, cracking

Bažant Z.P., Oh B.H., Crack Band Theory for Fracture of Concrete, Materiaux et Constructions. Vol.16-No 93, mai-juin, 1983.
DOI: https://doi.org/10.1007/BF02486267   Google Scholar

Bažant Z.P., Pfeiffer P.A., Determination of Fracture Energy from Size Effect and Brittleness Number, ACI Materials Journal, November-December, 1987.
  Google Scholar

Bosco C., Carpinteri A., Fracture Mechanics Evaluation of Minimum Reinforcement in Concrete Structures, Off-print from the volume "Applications of Fracture Mechanics to Reinforced Concrete". Elsevier Applied Science, 1992.
  Google Scholar

Carpinteri A., Ferro G., Apparent Tensile Strength and Fictitious Fracture Energy of Concrete: A Fractal Geometry Approach to Related Size Effects, Proceedings of the International Conference on Fracture and Damage of Concrete and Rock. Vienna, 1992.
  Google Scholar

Chambaud M.R., Le calcule a la supture par flexion des poutres eu beton arme a faible pourcentage d'armature tendue, Inst. Techn. du Beton et des Fr. Publ. nr 78, 1954.
  Google Scholar

Dąbrowski K., Prostokątne elementy zginane z betonu słabo zbrojonego, Towarzystwo Naukowe Ekspertów Budownictwa w Polsce. Warszawa, 1962.
  Google Scholar

Hillerborg A., Modeer M., Petersson P.E., Analysis of Crack Formation and Crack Growth in Concrete by Means of Fracture Mechanics and Finite Elements, Cement and Concrete Research. Vol. 6, 1976.
DOI: https://doi.org/10.1016/0008-8846(76)90007-7   Google Scholar

Hjorteset K., Minimum Reinforcement Requirements for Concrete Flexural Members Determined Using Nonlinear Fracture Mechanics, MSc thesis in Civil Engineering. University of Washington, 1990.
  Google Scholar

Mianowski K. M., Metoda analizy przyczepności i rys w żelbecie, Archiwum Inżynierii Lądowej, Vol. XXXVI, z. 1-2/1990.
  Google Scholar

Saliger R., Nowa teoria żelbetu na podstawie odkształceń plastycznych przy złamaniu, PWN. Warszawa, 1952.
  Google Scholar

Słowik M., Analiza nośności elementów z betonu słabo zbrojonego z uwzględnieniem stanów granicznych użytkowania, Rozprawa doktorska. Politechnika Lubelska, Lublin, 2000.
  Google Scholar

Słowik M, Błazik-Borowa E., Wpływ doboru prętów zbrojeniowych na rozkład naprężeń w elemencie betonowym, Eksploatacja i Niezawodność, nr4/2001.
  Google Scholar

Słowik M., Wyznaczania minimalnego stopnia zbrojenia w zginanych elementach z betonu, XIV Konferencja Naukowa „Metody numeryczne w projektowaniu i analizie konstrukcji hydrotechnicznych”. Korbielów 2002. Materiały pokonferencyjne, 2002.
  Google Scholar

Słowik M., O wyznaczaniu minimalnego stopnia zbrojenia zginanych elementów żelbetowych, Inżynieria i Budownictwo, nr 1/2003.
  Google Scholar

Styś D., Rejman G., Efekt skali a minimalny stopień zbrojenia belek żelbetowych, XLI Konferencja Naukowa KILiW PAN i KN PZITB, Kraków-Krynica, 1995.
  Google Scholar

Woliński Sz., Właściwości betonu rozciąganego i ich zastosowania w nieliniowej mechanice pękania, Zeszyty Naukowe Politechniki Rzeszowskiej Budownictwo i Inżynieria Środowiska. Vol. 15, No 91. Rzeszów, 1991.
  Google Scholar

CEB-FIP Model Code. Bulletin d'information, No. 196, 1990.
  Google Scholar

PN-56/B-03260, Konstrukcje żelbetowe. Obliczenia statyczne i projektowanie, 1956.
  Google Scholar

PN-B-03260, Konstrukcje żelbetowe. Obliczenia statyczne i projektowanie, 2002.
  Google Scholar

PrEN 1992-1-1, Design of Concrete Structures. General Rules and Rules for Buildings, 2002.
  Google Scholar

ZN-66/HP/1, Budowle hydrotechniczne. Konstrukcje słabo zbrojone. Obliczenia statyczne i projektowanie, Centralne Biuro Studiów i Projektów Budownictwa Wodnego "Hydroprojekt". Warszawa, 1966.
  Google Scholar


Published
2008-06-11

Cited by

Słowik, M. . (2008) “The analysis of load carrying capacity and cracking of slightly reinforced concrete members in bending”, Budownictwo i Architektura, 2(1), pp. 065–078. doi: 10.35784/bud-arch.2312.

Authors

Marta Słowik 

Department of Building Structures; Faculty of Civil Engineering and Architecture; Lublin University of Technology Poland
https://orcid.org/0000-0001-9627-3625

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