Research Article
Oct 1982
Strain-Rate Effect in Rapid Triaxial Loading of Concrete
Authors: Zdeněk P. Bažant, F.ASCE, and Byung H. OhAuthor Affiliations
Publication: Journal of the Engineering Mechanics Division
Volume 108, Issue 5
Abstract
Presented is a generalization of time-independent nonlinear triaxial constitutive relations for concrete to model short-time viscoelastic effects. The effect of strain-rate magnitude upon the initial elastic modulus, the peak stress, and the sharpness of the stress peak is taken into account. To obtain a model that also exhibits short-time rapid creep and stress relaxation, the incrementally linear constitutive law fully characterized by tangential moduli is replaced by a nonlinear first-order differential equation in stress, strain, stress rate and strain rate. This requires introduction of the (apparent) instantaneous modulus, the relaxation time and retardation time. The irreversibility at unloading, caused by the short-time viscoelastic mffects, is also analyzed. The model allows more realistic dynamic finite element analysis of concrete structures.
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Published In
Journal of the Engineering Mechanics Division
Volume 108 • Issue 5 • October 1982
Pages: 764 - 782
Copyright
© 1982 American Society of Civil Engineers.
History
Published in print: Oct 1982
Published online: Feb 3, 2021
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Authors
Affiliations
Zdeněk P. Bažant, F.ASCE
Prof. of Civ. Engrg. and Dir., Center for Concrete and Geomaterials, Northwestern Univ., Evanston, Ill. 60201
Byung H. Oh
Grad. Research Asst., Northwestern Univ., Evanston, Ill. 60201
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