Influence of shrinkage strains on the cracking of reinforced concrete beams
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[1] University of London
University of London
Reino Unido
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[2] The Concrete Centre
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[3] Arup Advanced Technology and Research
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- Localización: The Structural Engineer: journal of the Institution of Structural Engineer, ISSN 1466-5123, Vol. 98, Nº. 5, 2020, págs. 25-29
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
The development of strains in the tensile reinforcement of a reinforced concrete beam, obtained from fl exural tests using strain gauged reinforcement, is discussed and the consequences of loss of strain compatibility, together with plane sections no longer remaining plane, are highlighted. These are contrasted with assumptions made in practical design and some resulting mismatches are fl agged.
The eff ect of internally restrained shrinkage on strain distributions across both uncracked and cracked sections is discussed and it is shown that the reinforcement is in compression, even for the cracked situation. Experimental evidence is presented to support the latter assertion.
Results of this work demonstrate that it can be appropriate to add part of the shrinkage strain to the cracking strain resulting from mechanical loads. A revision to the crack width expression 7.8 in Eurocode 2, which currently ignores this eff ect, is proposed and discussed.
