配置高延性不锈钢钢筋混凝土柱抗震性能试验研究

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

摘要:

进行了6个配置高强度、低弹性模量、高延性的不锈钢钢筋混凝土柱的拟静力试验，并与普通钢筋柱对比，研究其破坏形态、滞回曲线、骨架曲线、位移延性等抗震性能和承载力，并分析轴压比和纵筋配筋率的影响。结果表明：不锈钢试件均发生柱根部正截面压弯破坏；其滞回曲线与普通钢筋试件的相似，但耗能能力更好；不锈钢试件的位移延性系数比普通钢筋试件的略低，但其屈服位移和极限位移分别比普通钢筋试件的大21%~24%和2%~19%；不锈钢试件的受弯承载力计算值和试验值之比与普通钢筋试件的相近，平均为0.79，具有一定的安全储备；当箍筋间距大于100mm时，其约束作用对试件承载力的提高不明显。

关键词:不锈钢钢筋;混凝土柱;拟静力试验;抗震性能

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.

Key words:stainless steel reinforcement;concrete column;pseudo-static test;seismic behavior