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| Author(s): |
Regiane Gonçalves
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) |
| Defense date: | 2003-03-14 |
| Examining board members: |
Osvaldo Luís Manzoli;
Túlio Nogueira Bittencourt;
Wilson Sergio Venturini
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| Advisor: | Osvaldo Luís Manzoli |
| Abstract | |
A constitutive model based on the continuum damage mechanics is proposed to describe the accumulation of the degradation produced by repeated loads in concrete materials. The proposed damage model presents the necessary conditions required in the strong discontinuity approach advocated by Simó, Oliver and Armero and, consequently, it can be used in the embedded strong discontinuity finite element approach. This class of approach has been recognized by its capability to model discontinuities independently on the element boundaries. In fracture mechanics, the embedded strong discontinuity element has been proved to be a efficient alternative to remedy the strong mesh dependence verified in smeared crack approaches, as well as to avoid the sophisticated remeshing techniques required in the discrete crack approaches, in which the crack is introduced in the element interfaces. This work provides an alternative tool for the analysis of crack propagation in concrete structures under fatigue in the context of the continuum damage mechanics. Numerical analysis of concrete elements under fatigue are performed to access the effectiveness of the proposed approach. (AU) | |