Research Article
Dec 1979
Approximate Relaxation Function for Concrete
Authors: Zdeněk P. Bažant, F.ASCE, and Sang-Sik KimAuthor Affiliations
Publication: Journal of the Structural Division
Volume 105, Issue 12
Abstract
Presented is an approximate algebraic formula for calculating the relaxation function for aging concrete. The formula is general; it applies to any form of the creep function. Compared to the previously used effective modulus method, the formula reduces the error from up to 37% to within 2% relative to the exact solution according to the superpositon principle. Calculation of long-time relaxation does not require knowledge of the elastic modulus and of the creep function for load duration below one day. The formula enables direct calculation of the age-adjusted effective modulus from the creep function, and thus it allows dispensing with the table of the aging coefficient. This is particularly useful in case of a more sophisticated creep model which reflects the fact that the creep functions for different humidities and sizes have different (nonproportional) shapes.
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Published In
Journal of the Structural Division
Volume 105 • Issue 12 • December 1979
Pages: 2695 - 2705
Copyright
© 1979 American Society of Civil Engineers.
History
Published in print: Dec 1979
Published online: Feb 1, 2021
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Authors
Affiliations
Zdeněk P. Bažant, F.ASCE
Prof. of Civ. Engrg., Northwestern Univ., Evanston, Ill.
Sang-Sik Kim
Structural Engr., Skidmore, Owings, and Merrill, Chicago, Ill.; formerly, Grad. Research Asst., Northwestern Univ., Evanston, Ill.
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.