Abstract
Four one-bay and one-story high-strength concrete frames were mad and tested under reversed cyclic lateral force while subjected to high axial compression. Test results have indicated that confinement of high-strength concrete columns in frame by steel tube instead of conventional hoop and use of high-strength steels as longitudinal rebars of the frame members could not only assure ductile seismic performance to the frame under high axial compression, but also reduce the residual story deformation to acceptable level. The damages in hoop-confirmed reinforced concrete beam were also significantly mitigated. In addition, a design formula was proposed to evaluate the ultimate lateral load capacity of the confined high-strength concrete frame. Good agreement between the theoretical ultimate lateral loads and measured results verified validity of the proposed formula.
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