Creep analysis of reinforced and prestressed concrete structures under non-uniform temperature distributions, using elastic solutions

Autor: M. M. A. Khalifa, I. J. Jordaan
Rok vydání: 1977
Předmět:
Zdroj: International Journal for Numerical Methods in Engineering. 11:883-895
ISSN: 1097-0207
0029-5981
DOI: 10.1002/nme.1620110510
Popis: The analysis of stresses and deformations in concrete structures subjected to temperature gradients is described. As a result of the spatial variation of temperature, the creep compliance is a function of position. Previous work has shown that the constitutive equations for concrete creep can be expressed in a form which is invariable although ageing is included in the analysis. Thus viscoelastic methods can be used and correspondence principles can be developed; emphasis is placed in the present work on those which are based on the Laplace transform. A particular form is described, in which replacement of the elastic modulus by a function of the transformed creep compliance gives transformed values of stress; these values are easily obtained numerically by the finite element method using elastic analyses. The transformed values of stress are then expressed as approximate functions of the transformed creep compliance; inversion of the ensuing functions gives the stress as an approximate function of time. Two applications are given; the first considers a simple axially loaded column with reinforcement and the second deals with a thick cylinder subjected to a temperature gradient.
Databáze: OpenAIRE
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