Analise de estruturas metalicas reticuladas planas considerando a não-linearidade fisica em sistemas não-conservativos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

In this work, analyses of steel plane framed structures, consisting of deformable frames by bending, shear and axial load are presented. In these analyses the effect of material nonlinearity in nonconservative systems are considered. According to the theory of small displacements, a computational program was developed to make possible the determination of the global structure behavior. The employed technique was the matrix method, using stiffness functions. This technique makes possible analyses considering the material nonlinearity of frames with little computational effort. For the nonlinear systems resolution the Newton-Raphson incremental-iterative method was adopted. The incremental load process was adopted to make possible the accompaniment of the deformations in the frames of the structure in the loading, unloading, and reverse loading, in accordance with the requested analysis. In the structures submited to reverse loading, the acting of Bauschinger effect in the system was considered. In the incrementalloading of the structure the frames follow the elastic or elastic-plastic behavior depending on the stress state. During the unloading of the structure the frames only follow the elastic behavior. Thus, the system can be considered nonconservative coming close to the real behavior. The elastic-plastic behavior was considered mainly for frames under axial loading using the column curve of CRC14 (Column Research Council) and the column curve of AISC-LRFD1 (Load and Resistance Factor Design). Numerical examples are presented comparing the types of analyses, in elastic and elastic-plastic behavior of the frames

ASSUNTO(S)

plasticidade estruturas metalicas plasticity steel structures

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