Análise numérica do comportamento estrutural e da resistência de terças de aço restringidas pelas telhas / Numerical analysis of cold-formed purlin-sheeting systems focused on the structural behavior and strength

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The structural behavior of purlin-sheeting system is complex and the complete analysis should consider the physical and geometrical nonlinearity, as well as the influence of the purlin-sheeting contact and connection. The brazilian code NBR 14762:2001 provides a design procedure to consider the interaction between a purlin or girt connected to the sheeting (factor R method). In Brazil purlins and girts are typically designed as isolated beams, without consideration for this purlin-sheeting combination. Numerical models proposed in the literature were analyzed and a finite element model (FEM) was developed considering nonlinearities and the contact between purlin and sheeting. The model was validated through experimental results and then implemented in a parametrical analysis. Expressions were generated using the parametrical results to relate the loading (wind uplift) to the displacements. The direct strength method (DSM) was analyzed to the designed of purlins restrained by sheeting. The finite strip method (FSM) was used for elastic buckling determination. The restraint applied to the sheeting was modeled using an elastic foundation on the flange connected to the sheeting. Two stress distributions were considered: (i) bending stresses and (ii) bending and warping stresses. In both cases the nominal flexural strength presented considerable differences compared to the factor R design method, reflecting the necessity of a specific study to evaluate the viability of the DSM approach for purlin design.

ASSUNTO(S)

método da resistência direta direct strength method steel purlin terça-telha cold-formed steel structures perfis formados a frio purlin- sheeting combination terças de aço estruturas de aço steel structures

ACESSO AO ARTIGO

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