Analise de porticos metalicos planos com conexões semi-rigidas considerando a não linearidade fisica e geometrica

AUTOR(ES)
DATA DE PUBLICAÇÃO

1999

RESUMO

: In this work, utilizing numeric process, are presented analyses of plane steel frames, deformables by flexion and axial force. In this analyses, are considered the effects of the structure geometric nonlinearity, of the material physical nonlinearity associated to the behaviour of semi-rigid connections. Are presented the models to the consideration of the nonlinear behaviour, such as, the development of ali the theory utilized. A software was developed, in the theory of the small displacements, to enable the determination of the structure global instability parameters. The adopted technique was the matrix, utilizing the functions of stiffness. This technique possibility analysis considering, simultaneously, the physical and geometric nonlinearity of the frames with a small computational effort. The inelasticity was considered for frames axially requested, predominantly, utilizing the buckling curves of CRC (Column Research Council), LRFD (American Institute of Steel Construction) e NBR 8800 (Associação Brasileira de Normas Técnicas). The behaviour of the moment-rotation relationship, of the semi-rigid connections, can be considered in a linear way, initial connection stiffness, or utilizing models to describe its nonlinear behaviour, connection stiffness give according to the connection moment. Besides the analyses, utilizing second order theory, it is presented a process to find the structure global instability, which will be found when a certain loading provoke a degeneration of the global stiffness matrix of the structure, making it singular...Note: The complete abstract is available with the full electronic digital thesis or dissertations

ASSUNTO(S)

ligações metalicas juntas (engenharia) estruturas metalicas estabilidade estrutural teorias não-lineares

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