Abstract
Although the effect of semi-rigid steel beam-to-column connections on the behaviour of steel frames and their substantial economic benefits are recognized nowadays, many structural analyses still consider connections as either fixed or pinned. For that reasons, there is need to be able the generate moment-rotation responses of semi-rigid connections that can be used for analysis and design proposes. Characteristic of the joints can be found using FEM models. The objective of the analysis was to find moment-rotation curves for beam-to-column joints with flange cleats and compare them to curves obtained from experimental studies. Numerical elastic-plastic 3D finite models was performed in order to establish a numerical analysis method for evaluating deformation of connections. For all joints there were obtained the FE results lightly underestimates results achieved from experiments. Some differences in the initial value of stiffness and resistances indicate the need for further work on improving FEM models. The inclusion of dimensional deviations of the IPE nad HEB sections, variability in the values of the prestressing forces of the bolts and the not centric positions of the bolts in the holes in the FEM model may contribute to increasing the degree of compliance of the results from experimental and numerical analyzes.
Highlights
Cost optimization is one of the most important items in steel construction in order to be competitive in the market of buildings
The results presented focused on the comparison of moment resistance, stiffness of beam-to-column connections with unstiffened and stiffened flange cleats obtained from numerical analyzes and experimental tests
Analysis of the results showed good agreement between test results and FEM models
Summary
Cost optimization is one of the most important items in steel construction in order to be competitive in the market of buildings. If one consider the large number of variables related to connection geometry, connection components, and constitutive relationships for their materials, the task of deriving simplified guidelines for the incorporation of semi-rigid behavior into design is a formidable analytical assignment This task is further complicated by the need to treat the problem in three dimensions, to consider nonlinear geometric and material effects and to include the effects of initial imperfections and residual stresses. In spite of these difficulties and complexities, in the past two decades a large number of advanced FE studies have been conducted on connections to provide stiffness, strength and ductility estimates for a large variety of connection geometries [4, 5, 6] These FE models have been used to develop moment-rotation curves, to verify design methodologies based on yield lines and other plastic design concepts, and to asseses local behavior in the connection components. The objective of the analysis was to find moment-rotation curves for beam-to-column joints with flange cleats using the FEM analysis and compare them to curves obtained from experimental studies
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