Plasticity and damage of framed structures
- Autores: Jeovan Faleiro de Freitas
- Directores de la Tesis: Horia Alejandro Barbat Barbat (dir. tes.), Sergio Horacio Oller Martínez (codir. tes.)
- Lectura: En la Universitat Politècnica de Catalunya (UPC) ( España ) en 2006
- Idioma: inglés
- Tribunal Calificador de la Tesis: Juan Miguel Canet (presid.), Lluís Gil Espert (secret.), Francesc Xavier Cahís Carola (voc.), Alexandru Hanganu (voc.), Eduardo Walter Vieira Chaves (voc.)
- Materias:
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- Resumen
The objective of this thesis is to develop an improved analytical model for predicting the plastic-damage response of multi-storey reinforced concrete frames, in accordance with the classic theories of Continuum Damage Mechanics and of classic Theories of Plasticity. What distinguishes this work from others is the fact the complete plastic-damage constitutive model, as well as the global damage, is here implemented into a frame analysis algorithm, where the frame is described by elastic beams and columns with two inelastic hinges at its ends.
The behaviour of the reinforced concrete is described throughout by means of continuum constitutive equations rates. We assume that the reinforced concrete presents two distinguished phases: the cracking of the concrete and the yielding of the reinforcement. The concrete cracking phase is described by means of Continuum Damage Mechanics, while the yielding of steel is described by means of the Plasticity Theory. Both, damage and plasticity, are solved simultaneously by means of an uncoupled plastic-damage model proposed for framed structures. With this model, we can describe adequately the behaviour of the reinforced concrete elements.
The elastoplastic behaviour of the frame is give by means of plastic hinges in agreement with the classical Plastic Analysis Theory. The evolution of the plastic hinges is obtained by yield functions for beams and columns. The damage in the hinges is obtained by means of the concentrated damage concepts, based on isotropic strain damage. To obtain the damage of a frame member, a new evaluation method is developed, based on a member damage index, which also leads to a meaningful global damage index of the whole structure. Those parameters are based on continuum mechanics principles in which the label "member damage" is applied only to damage indices describing the state of frame member while the "global" damage index refers to the state of the whole structure.
