Cyclic loading tests of interior beam–column connections for concrete-filled thin-walled tube columns.

• The through-beam and through-bar details at the interior beam-column connection for thin-walled CFT columns are proposed. • Cyclic loading tests for proposed details are performed to investigate their seismic performances. • Load-carrying capacity, failure modes, ductility, and joint shear capacity of each specimen is investigated. • Modified plastic stress distribution method are made based test observation. • Design and detailing considerations of the proposed details are given. In this study, the results of the cyclic loading tests of four interior connection specimens made of concrete-filled thin-walled tube column and U-section beam are presented. Through-beams and through-bars passing through the column were used as the connection details. The tests showed that both slip significantly occurred during cyclic loading and thus the strength, ductility, and energy dissipation capacity of the specimens were significantly affected by the connection details. The web plates of the beam U-section, which were welded to the thin column tube wall, did not fully contribute to the connection strength, due to out-of-plane deformation and premature weld fracture of the tube wall plates. Based on the test results, a modified plastic stress distribution method to estimate the connection strength was suggested. In addition, design and detailing considerations of the proposed through-beam and through-bar connection details are given. [ABSTRACT FROM AUTHOR]