A Constitutive Law for Concrete at Transient High Temperature Conditions


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Title: A Constitutive Law for Concrete at Transient High Temperature Conditions

Author(s): Y. Anderberg and S. Thelandersson

Publication: Special Publication

Volume: 55


Appears on pages(s): 187-206

Keywords: tion; high temperature rise stresses compressive strength; tern erature; strains; in concrete); thermal concretes; creep properties; deforma-stress- strain relationships; tempera-expansion; thermal gradient; thermal

Date: 8/1/1978

A computer-oriented constitutive model for concrete in compresslon, valid at first heating of concrete up to 800 C is described. The total deformation is expressed in terms of thermal, instantaneous stress-related, creep and transient strain components, where the transient strain is a concept introduced to describe the particular behavior under changing temperature. Comparisons with independent tests demonstrate that the material behaviour is described in a very appropriate way. The model is applied in a simple example calculation, showing that thermal stresses due to non-uniform temperature distribution are very insignificant or even nonexistant.Stresses due to restrained thermal expansion cannot in themselves contribute to compression failure of concrete.