Static inelastic analysis of steel frames with flexible connections

Abstract

The effects of connection flexibility and material yielding on the behavior of plane steel frames subjected to static (monotonic) loads are presented in this paper. Two types of material nonlinearities are considered: flexible nodal connections and material yielding, as well as geometric nonlinearity of the structure. To account for material yielding, a plastic hinge concept is adopted. A flexible connection is idealized by nonlinear rotational spring. Plastic hinge is also idealized by nonlinear rotational spring attached in series with the rotational spring that accounts for connection flexibility. The stiffness matrix for the beam with flexible connections and plastic hinges at its ends is obtained. To illustrate the validity and accuracy of the proposed numerical model, several examples have been conducted

Geometrically exact elastoplastic rods: determination of yield surface in terms of stress resultants

“…There, the rod's crosssection at yield is assumed to be fully plastified at the state of yield limit. These yield surfaces are often used to investigate inelastic properties and limit loads of steel frames [20,21]. The objective of this work is to present a framework enabling to determine a yield surface in terms of stress resultants for an arbitrary cross-section and deformation state.…”

Método dos mínimos quadrados na utilização de curvas momento-rotação na análise de pórticos planos semirrígidos

“…O último sistema estrutural considerado neste artigo é o pórtico metálico de sete andares e um vão, conforme ilustrado na Figura 9. Essa estrutura foi estudada inicialmente por NEFOVSKA-DANILOVIĆ e SEKULOVIĆ [32]. Para cada tipo de ligação e modelo utilizado são apresentados os resultados de deslocamento horizontal no topo da estrutura são descritos na Figura 10 em função da do nível de carga aplicada.…”