File Name: structural steel semirigid connections theory design and software .zip
Through this study, a method is presented to estimate moment-rotation M- curve of I beam-to-the concrete filled tube CFT connections. This method is based on the components method in which components are analyzed and modeled as different mechanical models. These components are considered as springs with specific mechanical properties of stiffness, strength, and rigid bars. Their force-displacement relationship is assumed bi-linear and 3-linear. The connection behavior is assumed through assembling the stiffness of different components.
Althoughthe semirigidity concept was introduced many years ago, steel structures are usually designed byassuming that beam-to-column joints are either pinned or rigid. Theses assumptions allow a greatsimplification in structural analysis and design-but they neglect the true behavior of joints. Theeconomic and structural benefits of semirigid joints are well known and much has been written abouttheir use in braced frames. However, they are seldom used by designers, because most semirigidconnections have highly nonlinear behavior, so that the analysis and design of frames using them isdifficult. In fact, the design problem becomes more difficult as soon as the true rotational behavior ofbeam-to-column joints is accounted for-the design problem requires many attempts to achieve asafe and economical solution.
Considering the nonlinear behaviors of semi-rigid connections, a new calculation model for the second order elastic-plastic analysis of plane steel structures is presented by replacing the general element with a new one, which has two rotational springs at its ends. And the second order elastic-plastic program of this kind of structure is worked out. Two steel frames are calculated with this program. The results of calculations show that this model is reliable and fit to the analysis of all plane steel structures. Request Permissions. New York Swanson, Roberto T.
It is well known that the real behaviour of joints lies between the ideal pinned or rigid joint responses. Additionally the influence of this behaviour on the global structural response has been widely studied in the past centred on the plastic resistance or the critical load. On the other hand, there are relatively few studies focusing on the dynamical response of these structures. This paper aims to discuss these issues.
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Over the past several years, extensive theoretical, numerical and experimental research has been carried out on the structural behavior of steel beams with web openings of various shapes. However, in all these studies, cellular beams have always been treated or designed as simply supported at their ends. In other words, the beam to column connections are assumed as nominally pinned. Interaction between a circular or sinusoidal opening in the beam web and endplate connection has also been studied. Data obtained from a number of experimental research programs on steel solid beam to column connections and simply supported cellular beams, available in the literature, were utilized to validate the numerical models developed in this paper. The numerical simulations using ABAQUS software were performed on full scale cellular steel beams connected to the columns with seven types of endplate connections. The results were compared with those obtained for similar simply cellular beams.
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