THERMOMECHANICAL CREEP OF AGING CONCRETE: A UNIFIED APPROACH
A unifying analytical structure is provided for studying creep of concrete subjected to uniaxial stress (loading and relieving) with simultaneous changes in temperature. A general thermomechanical creep equation was formulated, in which rate and history effects are reflected by internal variables, the evolution of which is modeled by first-order differential equations, expressing growth laws which determine the amount of creep. The total creep deformation is composed of instantaneous and delayed elastic parts as well as permanent flow. Introduction of the concept of an effective time permits representation of the creep law as a convolution integral, the corresponding kernel of which is the creep function. In addition to possessing a degenerate structure, leading to a numerical solution scheme, the model suggests test programs from which internal variable parameters can be evaluated from measurements of recoverable and permanent creep deformation as functions of time, loading age, and temperature.
- Subm-Sponsored in Part by Fulbright Grant.
Stuttgart University, West GermanyInstitute of the Statics and Dynamics of Aeronatucial Constr
7 Stuttgart, Germany
- Argyris, J H
- Pister, K S
- Willam, K J
- Publication Date: 1974
- Pagination: 47 p.
- TRT Terms: Aging (Materials); Axial loads; Concrete; Creep; Creep properties; Differential equations; Equations; History; Loads; Mathematical models; Rates; Temperature; Thermal stresses; Time; Viscoelasticity
- Uncontrolled Terms: Axial stress; Loading; Loading rate
- Old TRIS Terms: Aging; Concrete creep; Convolution integrals
- Subject Areas: Highways; History; Materials;
- Accession Number: 00092526
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: ISD-167
- Contract Numbers: SBB-4act
- Files: TRIS
- Created Date: Nov 5 1975 12:00AM