Abstract
Tensile loading tests have been carried out to determine the local behavior of a connection between high-strength concrete-filled square tubular steel column and steel beam, reinforced with an external vertical stiffener. The vertical stiffener is installed on the inside depth of steel beam to avoid interference with finishing material and reinforcement in slabs. Test results show that the maximum strength of the connection depend on the fracture of web near the corner of the steel tube, and that the web's strength vary with height of the stiffener. The load-displacement relationships can be approximated by an analysis that assumes a tri-linear-type model for the steel tube and the stiffener.
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