Modelling of Creep in High Strength Concrete

Urquhart, James (2008). Modelling of Creep in High Strength Concrete Honours Thesis, School of Engineering, The University of Queensland.

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Author Urquhart, James
Thesis Title Modelling of Creep in High Strength Concrete
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2008-01-01
Thesis type Honours Thesis
Supervisor Liza O’Moore
Total pages 57
Language eng
Subjects 0905 Civil Engineering
Formatted abstract
Creep is the component of strain in concrete that is dependent on both time and sustained stress. The proportion of strain as a result of creep can be quite large and as such it is an important consideration in the design of structures. Generally, the mathematical models currently used to model creep perform poorly for the case of high strength concrete. Within this project  several of these models are considered and modifications applied in an effort to improve their  accuracy for this case. The models considered are the revised AS3600 (found in DR05252), GL2000, ACI, Eurocode 2 and B3 models.

Modifications applied to the models are aimed at removing the drying portion of creep. The revised  AS3600 and Eurocode 2 models have been recently updated to include high strength concrete. The predicted values of creep coefficient given by each of the models are compared with experimental  data from three test specimens.

It is found that the removal of drying creep has a positive effect on the accuracy of predictions for most cases. Improvements were achieved for all data sets in the case of the GL2000 and B3 models. A significant improvement was made for the ACI model for the highest strength (87.8 MPa) specimen whereas for the lower strength (69 MPa) specimens the unmodified model provided very accurate predictions.

The Eurocode 2 model is found to consistently provide the most accurate predictions of creep in high strength concrete. This model is also simple to apply in design situations. Model B3 also provides reasonably accurate predictions; however, its complexity and required inputsmean its use is not recommended.

Keyword Creep
High Strength Concrete

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
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Created: Fri, 31 Oct 2014, 20:10:02 EST by Asma Asrar Qureshi on behalf of Scholarly Communication and Digitisation Service