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2015 Impact Factor: 0.519 ©2015 Thomson Reuters, 2015 Journal Citation Report®

ISSN 1822-427X print
ISSN 1822-4288 online



"The Baltic Journal of Road and Bridge Engineering"
Vilnius: Technika, 2011, Vol VI, No 3, p. 193-200

Gediminas Marčiukaitis, Remigijus Đalna, Bronius Jonaitis, Juozas Valivonis

Calculation Model for Steel Fibre Reinforced Concrete Punching Zones ff Bridge Superstructure and Foundation Slabs

DOI: 10.3846/bjrbe.2011.25
The usage of steel fibre reinforced concrete in monolithic joins is well known as a good alternative of additional reinforcement because of chaotic distribution of steel fibres in complex stress ant strain state. Unfortunately, the analysis of well known design codes and different models even in punching case without steel fibres shows that there is no common theory in calculating punching shear strength. Existing models of punching shear strength with steel fibres are mainly based on empirical coefficients, or require direct tests, what makes the design of such structures more complicated. Besides, the analysis of elastic and plastic characteristics of steel fibre reinforced concrete is incomplete, because there is no unified, well-grounded theory to evaluate them. The aim of this paper is to present steel fibre reinforced concrete punching shear strength model. Suggested steel fibres reinforced concrete punching shear strength model estimates the main factors, such as concrete strength, longitudinal reinforcement, steel fibres volume, type, geometric and anchoring characteristics, and also plastic strains of steel fibre reinforced concrete. The comparison of suggested model with tests results demonstrates good accuracy of the suggested model for steel fibre reinforced concrete slabs (mean value – 1.12, standard deviation – 0.08 coefficient of variation – 7%).
Keywords: punching shear strength, steel fibres, reinforced concrete, plastic strains, complex stress and strain state.

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