Abstract：In order to study the seismic responses of steel reinforced concrete spatial frames with special-shaped columns, a 1/4-scaled frame model was tested on the shaking table with the El Centro wave, Taft wave and Lanzhou wave as inputs, respectively. The dynamic characteristics, strain responses, acceleration responses, displacement responses, base shears and the energy dissipation capacity were analyzed. The results show that under strong earthquake, the failure mode of the steel reinforced concrete frame with special-shaped columns is the beam-hinged mechanism, satisfying the seismic principle of “strong column and weak beam”. With the increase of the peak accelerations of the input seismic waves, the accumulated damage of the frame increase gradually, resulting in the decrease of the natural frequency, the increase of the damping ratio, and the delay of the peak accelerations and displacements. Torsion deformation of the frame appeared during the process from elastic stage to plastic stage. The base shears grew fast firstly and then slowly. The hysteretic curves were plump, indicating the good energy dissipation capacity of the frame. Steel reinforced concrete frame with special-shaped columns can meet the seismic requirements of strong-columns-weak-beams and no collapse under the rare earthquakes.
