Influence of shrinkage strains on the cracking of reinforced concrete beams

Author: Richard Scott, Tony Jones and Robin Whittle

Date published

1 May 2020

Price
Standard: £9
Members/Subscribers: Free
 
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Influence of shrinkage strains on the cracking of reinforced concrete beams

Tag
Author
Richard Scott, Tony Jones and Robin Whittle
Date published
1 May 2020
Price
Standard: £9
Members/Subscribers: Free
 
The Structural Engineer
Author

Richard Scott, Tony Jones and Robin Whittle

Date published

1 May 2020

Author

Richard Scott, Tony Jones and Robin Whittle

Price

Standard: £9
Members/Subscribers: Free
 

The development of strains in the tensile reinforcement of a reinforced concrete beam, obtained from flexural 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 flagged.

The effect 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 effect, is proposed and discussed.

Additional information

Format:
PDF
Pages:
5
Publisher:
The Institution of Structural Engineers

Tags

Concrete - reinforced Loading Strain Technical Issue 5

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