Experimental Study on the Seismic Performance and Index for Different Performance Levels of SRC Columns

Abstract eng:
Six half scale steel reinforced concrete (SRC) columns were tested under cyclic loading. The effects of the axial compression ratio and stirrup ratio on the hysteretic characteristics of SRC columns were investigated. The results indicated that the displacement ductility index decreased with the increasing of the axial load and increased with the increasing of the stirrup ratio. When the axial compression ratio of specimens increased from 0.15 to 0.40, the displacement ductility index reduced with the proportion of 41.2%. When the stirrup ratio of the specimens increased from 0.78% to 1.86%, the displacement ductility index increased with the proportion of 17.8%. According to the damage characteristic and test data, a series of performance parameters and corresponding limit value that can be used to appraise the performance level of SRC columns under earthquake was proposed. It is suggested that the crack width and stress level of longitudinal bar, residual drift and ultimate drift index can be adopted as the key parameters to appraise the different seismic performance levels, i.e. functional, repairable and collapse avoidable, respectively. If the story drift angle be used as an appraisal parameter, it is recommended that the limit values for the four performance levels, i.e. fully operation, operation, repairable and collapse avoidable be 1/250, 1/150, 1/50 and 1/35, respectively. The conclusions of this paper can be used as references for the performance based seismic design and engineering practice.

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