The objective of this research is to understand stress-transfer mechanism of concrete-filled tube (CFT) column-to-beam connections with external T-stiffener by using a nonlinear finite element analysis and to offer basic data for the design of Tstiffener connection. Firstly, the same shapes of the full-scale test specimens were modeled for the finite element analysis to delineate the problems of previous test results, The models of analysis with different T-stiffener are grouped into T-stiffener (TS series), T-stiffener with a dog bone (TSD series), i.e., reduced beam section (RBS cutout), and T-stiffener with holes in horizontal element (TSH series). Results of the nonlinear finite element analysis were compared with the test results. Secondly, a parametric study was conducted to investigate an alternative plan that decreases the concentration of stress in the connection. The main parameters were the types of horizontal elements, the ratio of horizontal and vertical element strength to beam strength, presence of RBS cutout, and size of holes. Several stress and strain indices were used understand the stress-transfer mechanism of the connection with various T-stiffeners parameters. The basic design ideas are recommended based on various performance indices in relation to the connection details.
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