Efeito da resist?ncia ao cisalhamento do concreto na flex?o de lajes de concreto armado

• Main Author: Rocha, M?rcurie Janeai Mateus Araujo
• Other Authors: Lima, Jos? M?rio Feitosa
• Format: Others
• Language: Portuguese
• Published: Universidade Estadual de Feira de Santana 2017
• Subjects: Lajes de concreto armado; Mec?nica do dano; M?todo dos elementos finitos; Reinforced concrete slabs; Damage mechanics; Finite element method; ENGENHARIA CIVIL::CONSTRUCAO CIVIL; ENGENHARIA CIVIL::ESTRUTURAS
• Online Access: http://localhost:8080/tede/handle/tede/533

Submitted by Luis Ricardo Andrade da Silva ([e-mail]) on 2017-11-28T23:42:31Z No. of bitstreams: 1 Dissertacao - Mercurie Janeai Mateus Araujo Rocha.pdf: 2758370 bytes, checksum: 944f4fc5f24c7c08b8ca7abcf999414a (MD5) === Made available in DSpace on 2017-11-28T23:42:31Z (GMT). No. of bitstreams: 1 Dissertacao - Mercurie Janeai Mateus Araujo Rocha.pdf: 2758370 bytes, checksum: 944f4fc5f24c7c08b8ca7abcf999414a (MD5) Previous issue date: 2017-09-04 === Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES === In this work the influence of the shear strength of the concrete in the bending of reinforced concrete slabs was studied through two models of analysis. The first model (proposed model 1) combines an isotropic damage model for concrete, proposed by Oliver et al., and the perfect elastoplastic model for steel reinforcement. The second model (proposed model 2), which is in fact a modification of the previous model, introduces a unique damaging to the concrete transverse modulus of elasticity, based on a proposal by Matzenbacher. The behavior of slabs was simulated through the Classical Theory of Laminates and the variational formulation of the problem was developed through the Principle of Virtual Works. The numerical treatment of the problem was based on the Finite Element Method, using a finite rectangular element with 24 degrees of freedom, incorporating Newton-Raphson's incremental-iterative process with load control and displacement control. The validation of the two models was based on the simulation of four rectangular slabs under bending, whose analysis revealed that it is essential to damage the concrete modulus of elasticity when using the damage mechanics. === Neste trabalho foi estudada a influ?ncia da resist?ncia ao cisalhamento do concreto na flex?o de lajes de concreto armado, atrav?s de dois modelos de an?lise. O primeiro modelo (modelo proposto 1) combina um modelo de dano isotr?pico para o concreto, proposto por Oliver e colaboradores, e o modelo elastopl?stico perfeito para o a?o das armaduras. O segundo modelo (modelo proposto 2), que na verdade ? uma modifica??o do modelo anterior, introduz uma danifica??o exclusiva para o m?dulo de elasticidade transversal do concreto, baseado em uma proposta de Matzenbacher. O comportamento das lajes foi simulado atrav?s da Teoria Cl?ssica de Laminados sendo desenvolvida a formula??o variacional do problema por meio do Princ?pio dos Trabalhos Virtuais. O tratamento num?rico do problema foi baseado no M?todo dos Elementos Finitos, utilizando um elemento finito retangular com 24 graus de liberdade, incorporando o processo incremental-iterativo de Newton-Raphson com controle de carga e controle de deslocamento. A valida??o dos dois modelos se deu a partir da simula??o de quatro lajes retangulares sob flex?o, cujas an?lises revelaram ser imprescind?vel a danifica??o do m?dulo de elasticidade transversal do concreto ao se usar a mec?nica do dano.