高强钢筋约束混凝土柱的抗震性能

Seismic Behavior of High-strength Concrete Columns Confined by High-strength Stirrups

以普通钢筋(400 MPa)和高强钢筋(1000 MPa)为约束箍筋,通过低周反复水平加载试验,对比分析了6组不同配筋率和间距的高强钢筋约束混凝土柱的轴压破坏形态和抗震性能。结果表明:普通钢筋约束混凝土试件的位移延性分别低于相同配筋率下的高强钢筋约束混凝土试件;无论是在相同配箍率还是在相同箍筋间距条件下,高强钢筋约束高强混凝土柱的等效粘滞阻尼系数都会高于普通钢筋约束混凝土试件,且配箍率需要高于1.00%;在相同配箍率条件下,高强钢筋约束混凝土的极限位移角和总耗能都大于普通钢筋约束混凝土试件;高强钢筋约束混凝土试件的抗震性能明显高于普通钢筋混凝土试件。

Using ordinary steel bars(400 MPa)and high-strength steel bars(1000 MPa)as confined stirrups,the failure modes and seismic performance of axial compression of six groups of high-strength reinforced concrete columns with different reinforcement ratios and spacings are compared and analyzed through horizontal low cyclic repeated loading test.The results show that the displacement ductility of the ordinary reinforced concrete specimens is lower than that of the high-strength reinforced concrete specimens with the same stirrup ratio;the equivalent viscous damping coefficient of the high-strength reinforced concrete columns with the same stirrup ratio(higher than 1.00%)or the same stirrup spacing is higher than that of the ordinary reinforced concrete specimens;at the same stirrup ratio,the ultimate displacement angle and total energy dissipation of high-strength reinforced concrete specimens are greater than those of ordinary reinforced concrete specimens,and the seismic performance of high-strength reinforced concrete specimens is significantly better than that of ordinary reinforced concrete specimens.