600MPa钢筋混凝土十字形柱抗震性能参数分析

为研究600 MPa钢筋混凝土十字形柱的抗震性能,对4个不同轴压比的试件进行低周往复荷载试验。研究结果表明600 MPa钢筋混凝土十字形柱的滞回曲线饱满对称,耗能能力良好;采用ABAQUS软件对试件进行有限元分析,对比分析试件的滞回曲线和骨架曲线,有限元计算结果与试验结果吻合较好。在此基础上,分析配箍率、钢筋强度和配筋率对600 MPa钢筋混凝土十字形柱抗震性能的影响。分析结果表明:随着配箍率增大,试件的极限承载力提高;随着钢筋强度的提高,试件的峰值荷载增大,塑性变形能力增强,抗震性能得到改善;随着配筋率增大,试件的滞回环更加饱满,耗能能力增强,但刚度退化加速。

Analysis of seismic performance parameters of cross-shaped columns with 600MPa reinforcement

In order to study the seismic behavior of the cross-shaped columns with 600MPa reinforcement, four specimens with different axial compression ratios were tested under low cyclic loading. The results show that the hysteretic curve was symmetrical and the energy dissipation capacity was fine. A finite element analysis was carried out by using ABAQUS software. The hysteretic curve and the skeleton curve were in good agreement with the experimental results. On this basis, the influence of the stirrup ratio, reinforcement strength and the reinforcement ratio on the seismic behavior of the cross-shaped columns with 600MPa reinforcement were analyzed. The results show that: with the stirrup ratio increases, the ultimate bearing capacity of the specimen increased; With the increase of the reinforcement strength, the peak load and the plastic deformation capacity were enhanced and the seismic performance was improved. With the increase of the reinforcement ratio, the hysteresis loop of the specimen was fuller and the energy dissipation capacity was enhanced while the stiffness degradation was accelerated.