Experimental Research on Seismic Behaviors of Concrete Columns with High-ductility Stainless Steel Reinforcements

Abstract:

The pseudo-static tests of six high-strength, low-elastic-modulus and high-ductility stainless steel reinforced concrete columns were conducted. By comparing with the ordinary reinforced concrete columns, failure patterns, hysteretic curves, skeleton curves, displacement ductility, bearing capacity and the influences of axial compression ratio and longitudinal reinforcement ratio on its seismic behaviors were analyzed. The results show that stainless steel specimens suffer axial and flexural failure at the end of columns. The hysteretic curves of stainless steel specimens are similar to those of ordinary steel specimens, but stainless steel specimens show better energy dissipation capacity. The displacement ductility coefficients of stainless steel specimens are slightly smaller than those of ordinary steel specimens, but the yield displacements and ultimate displacements of stainless steel specimens are larger than those of ordinary steel specimens by 21%~24% and 2%~19% respectively. The ratios between the calculated values and test values of the flexural capacity of stainless steel specimens are similar to those of ordinary steel specimens, with an average value of 0.79, which has a certain safety reserve. When the stirrup spacing is greater than 100mm, the restraint effect on the bearing capacity of specimens is not obvious.