Axial Load and Cyclic Lateral Load Tests for Composite Columns with Steel Angles

Abstract

To enhance the structural capacity and constructability of composite columns, a prefabricated steel-reinforced concrete (PSRC) column was developed. By using the prefabricated steel cage, field rebar work is unnecessary, and the self-erectable steel cage can provide sufficient strength and rigidity to support the construction loads of beams and slabs. In the present study, various steel angle ratios, transverse bar spacings, and prefabrication details were considered for better structural capacity and constructability. To investigate the performance of the proposed method, axial loading tests and cyclic lateral loading tests were performed. In the axial loading test, the structural performance of the PSRC columns was comparable to, or even better than, that of the conventional composite column using the wide flange steel section, when early spalling of the cover concrete was restrained by closely spaced hoops. Under cyclic lateral loading, on the other hand, the PSRC columns were more susceptible to early concrete spalling and steel angle buckling. Thus, when high ductility is required under cyclic lateral loading, the steel angles need to be embedded in the core concrete using thicker cover concrete and hoops.