不同约束系数区域约束混凝土柱抗震性能对比分析

Contrastive Analysis of Seismic Performances on Regional Confined Concrete Columns with Different Restraint Coefficients

对轴压比分别为1.1及1.25的共4根约束混凝土柱的滞回曲线、耗能能力及刚度退化进行对比分析。分析表明:同一轴压比下,区域约束混凝土柱的各项抗震性能指标均优于传统箍筋柱。对于区域约束混凝土柱,在轴压比提高的同时,如果相应提高约束系数K,构件的各项抗震性能指标可以得到相应改善。所以对于区域约束混凝土柱用约束系数K作为衡量其抗震性能的一个参考指标,有一定合理性。

Contrastive analysis was conducted about hysteresis curve, energy dissipation and stiffness degradation on 4 confined concrete columns with axial compression ratio 1.1 and 1.25. Analysis shows that the seismic per- formances of regional confined concrete columns are superior to traditional stirrup columns at same axial compres- sion ratio. Seismic indicators of regional confined concrete columns can be improved accordingly when increasing the axial compression ratio and restraint coefficient accordingly. So it is reasonable to consider restraint coeffi- cient as a reference and apply it to evaluate seismic performances in regional confined concrete columns.