00213841

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http://onlinepubs.trb.org...s/hrr/1970/324/324-001.pdf

THE INSTANTANEOUS DEFORMATIONS OF CONCRETE ARE EXPLAINED AS A RESULT OF ELASTIC DEFORMATIONS AND INTERNAL CRACK PROPAGATION. EMPIRICAL FORMULAS ARE PRESENTED FOR THE NUMERICAL APPROXIMATION OF THE STRESS-STRAIN DIAGRAM. THE DEFINITIONS AND VARIOUS STATIC AND DYNAMIC TEST METHODS ARE DISCUSSED FOR THE DETERMINATIONS OF THE YOUNG'S MODULUS, SHEAR MODULUS, AND POISSON'S RATIO. RELATED FORMULAS ARE ALSO PRESENTED. COMPARISONS ARE MADE BETWEEN STATIC YOUNG'S MODULI DETERMINED BY VARIOUS METHODS, BETWEEN DYNAMIC YOUNG'S MODULI OBTAINED BY VARIOUS METHODS, BETWEEN STATIC AND DYNAMIC MODULI, AND BETWEEN STATIC AND DYNAMIC POISSON'S RATIOS. IT IS SHOWN THAT THE CONSTANTS DETERMINED BY DYNAMIC METHODS ARE GREATER THAN THE CORRESPONDING STATIC CONSTANTS. ATTEMPT IS MADE TO EXPLAIN THE DIFFERENCES REVEALED. DATA CONCERNING THE REPRODUCIBILITY OF THE ELASTIC CONSTANTS INDICATE THAT THE TEST METHODS FOR DYNAMIC CONSTANTS ARE SUPERIOR IN THIS RESPECT. THE STATIC ELASTIC CONSTANTS OF CONCRETE ARE OF GREATER SIGNIFICANCE TO THE DESIGN ENGINEER THAN THE CORRESPONDING DYNAMIC VALUES. ON THE OTHER HAND, THE DETERMINATION OF THE DYNAMIC CONSTANTS IS EASIER. /AUTHOR/

Paper sponsored by Committee on Mechanical Properties of Concrete. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01410263

pp 1-14

1970

Highway Research Record

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Figures (5) ; References (80)

Concrete; Constants; Cracking; Deformation; Deformation curve; Dynamics; Elastic deformation; Elasticity (Mechanics); Loads; Modulus of elasticity; Poisson ratio; Reviews; Shear modulus; Statics

Highways; Materials

TRIS, TRB

Apr 25 1971 12:00AM

• DEFORMATION OF CONCRETE AND ITS CONSTITUENT MATERIALS IN UNIAXIAL TENSION
• STRAIN GRADIENT AND THE STRESS-STRAIN RELATIONSHIP ON CONCRETE IN COMPRESSION
• THE EFFECT OF HOLES ON TENSILE DEFORMATIONS IN PLAIN CONCRETE
• THE INELASTIC DEFORMATION OF CONCRETE
• TIME-DEPENDENT DEFORMATION OF NONCOMPOSITE AND COMPOSITE PRESTRESSED CONCRETE STRUCTURES
• YOUNG'S MODULUS, CREEP, AND SHRINKAGE OF GAP-GRADED CONCRETE VERSUS CONTINOUSLY GRADED CONCRETE