THERMO-CHEMO-MECHANICAL MODEL FOR CONCRETE. II: DAMAGE AND CREEP

In this work a coupled thermo-chemo-mechanical model for the behavior of concrete at early ages is proposed. This paper presents the formulation and assessment of the mechanical aspects of the model. Short- and long-term mechanical behaviors are modeled via a viscoelastic damage model that accounts for the aging effects. The short-term model is based on the framework of the continuum damage mechanics theory. A novel normalized format of the damage model is proposed, so that the phenomenon of aging is accounted for in a natural fashion. Long-term effects are included by incorporating a creep model inspired in the microprestress-solidification theory.

[1]  Zdeněk P. Bažant,et al.  Mathematical modeling of creep and shrinkage of concrete , 1988 .

[2]  J. Oliver,et al.  A strain-based plastic viscous-damage model for massive concrete structures , 1998 .

[3]  Miguel Cervera,et al.  THERMO-CHEMO-MECHANICAL MODEL FOR CONCRETE. I: HYDRATION AND AGING , 1999 .

[4]  Jean-Louis Chaboche,et al.  ASPECT PHENOMENOLOGIQUE DE LA RUPTURE PAR ENDOMMAGEMENT , 1978 .

[5]  J. Oliver.  A consistent characteristic length for smeared cracking models , 1989 .

[6]  J. Lemaître.  How to use damage mechanics , 1984 .

[7]  Denis Mitchell,et al.  Early age compressive stress-strain properties of low-, medium, and high-strength concretes , 1995 .

[8]  J. C. Simo,et al.  Strain- and stress-based continuum damage models—II. Computational aspects , 1987 .

[9]  Miguel Cervera,et al.  A RATE-DEPENDENT ISOTROPIC DAMAGE MODEL FOR THE SEISMIC ANALYSIS OF CONCRETE DAMS , 1996 .

[10]  J. Chaboche.  Continuum Damage Mechanics: Part II—Damage Growth, Crack Initiation, and Crack Growth , 1988 .

[11]  J. Chaboche.  Continuum Damage Mechanics: Part I—General Concepts , 1988 .

[12]  Zdeněk P. Bažant,et al.  Viscoelasticity with Aging Caused by Solidification of Nonaging Constituent , 1993 .

[13]  Zdenek P. Bazant,et al.  I: Formulation , 2022 .

[14]  Gilles Pijaudier-Cabot,et al.  CONTINUUM DAMAGE THEORY - APPLICATION TO CONCRETE , 1989 .

[15]  Rui Faria,et al.  Seismic evaluation of concrete dams via continuum damage models , 1995 .

[16]  Franz-Josef Ulm,et al.  Microprestress-Solidification Theory for Concrete Creep. I: Aging and Drying Effects , 1997 .

[17]  J. C. Simo,et al.  Strain- and stress-based continuum damage models—I. Formulation , 1989 .