NONLINEAR CREEP DAMAGE MODEL FOR CONCRETE UNDER UNIAXIAL COMPRESSION

An isotropic model for creep damage of concrete under uniaxial compression is proposed, where the combined effect of nonlinear viscous strain evolution and crack nucleation and propagation at high stress levels is considered. Strain splitting assumption is used for creep and damage contributions. Creep is modeled by a modified version of solidification theory. As usual in the modeling of damage of concrete, a damage index based on positive strains is introduced. As particular cases, the proposed model reduces to linear viscoelasticity for long time low stress levels whereas, for very high stresses, tertiary creep causing failure at a finite time can be described. The effect of strength variation with time is also included. The model is numerically implemented to perform time integration of nonlinear equations by means of a modified version of exponential algorithm. The model is validated through comparison with experimental results. Some numerical examples are also provided, where the roles of concrete ageing and strength variation with time are investigated.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/07339399
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Mazzotti, C
  • Savoia, M
• Publication Date: 2003-9

Language

• English

Media Info

• Features: Figures; References;
• Pagination: p. 1065-75
• Serial:
  • Journal of Engineering Mechanics
  • Volume: 129
  • Issue Number: 9
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9399
  • EISSN: 1943-7889
  • Serial URL: http://ascelibrary.org/journal/jenmdt

Subject/Index Terms

• TRT Terms: Concrete structures; Creep properties; Nonlinear systems; Solidification; Structural analysis; Structural deterioration and defects; Structural mechanics; Uniaxial stress; Validation
• Subject Areas: Bridges and other structures; Design; Highways; Planning and Forecasting; I21: Planning of Transport Infrastructure; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00961760
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 29 2003 12:00AM