EXPERIMENTAL RESEARCH ON SEISMIC BEHAVIOR OF PRECAST RC COLUMNS WITH STEEL BARS SPLICED BY COMPRESSIVE SLEEVES

To study the seismic behavior of precast reinforced concrete columns with longitudinal reinforcement spliced by compressive sleeves, quasi-static tests of eight columns of 500 mm×500 mm cross section were conducted. Among them, seven were precast columns with characteristic stirrup ratios from 0.15 to 0.187 and axial load ratios from 0.65 to 0.80, whereas one was a cast-in-place column. The test results indicate that the compressive sleeve connectors could effectively transfer the tensile and compressive force of steel bars. The failure process and failure mode of the precast columns were similar to those of the cast-in-place column. The lateral load-displacement hysteretic loops of the precast columns were plump. The experimental eccentrically compressive strength was 1.26~1.42 times the calculated value. The ultimate drift ratios ranged from 1/42 to 1/26. The compressive sleeve connector can be used to connect longitudinal reinforcement in precast reinforced concrete columns designed to resist seismic actions.