Journal article
Zur Druck-Zug-Festigkeit von Stahlbeton und stahlfaserverstärktem Stahlbeton



Publication Details
Authors:
Fehling, E.; Leutbecher, T.; Röder, F.
Publication year:
2009
Journal:
Beton- und Stahlbetonbau / Concrete and Reinforced Concrete Structures
Pages range:
471-484
Volume number:
104
ISSN:
0005-9900

Abstract
Biaxial Compression-Tension-Strength of Reinforced Concrete and Reinforced Steel Fibre Concrete The compressive strength of concrete can be substantially increased in relation to uni-axial compressive strength by transverse compression acting at the same time. In contrast, transverse tension and cracking lead to a re­duc­tion of the load-carrying capacity. This holds true for plain concrete as well as for reinforced concrete. In inter­national standards very different calculation rules can be found on this subject, whereby the provided re­ductions differ up to a factor of two for the same application. The question of biaxial compression-tension-strength of reinforced concrete was examined in the past 40 years by numerous scientists. Their results are, however, partially contradictory in the same way as the current stan­dard si­tuation. Based on own experimental investigations as well as on a critical review and classification of for­mer test series regarded as trend-setting, a proposal for the reduction of the compressive strength of cracked re­inforced concrete is developed. For the first time, also the influence of fibres in addition to bar reinforcement is considered thereby. A comparison with the calculation rules in DIN1045-1, CEB-FIPModelCode1990, Eurocode2, and ACIStan­dard318-05 shows, that exclusively DIN1045-1 underestimates sometimes substantially the maximum reduction of the com­pres­sive strength by transverse tension and cracking observed in the tests, so that a conservative design of struc­tures cannot always be ensured.

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