论文部分内容阅读
对2个圆钢管混凝土悬臂长柱压弯试件和1个钢管柱对比试件进行了低周反复加载试验,研究了轴压力和钢管内填混凝土对试件抗震性能的影响,得到了试件的荷载-位移滞回曲线、骨架曲线等抗震性能指标,分析了试件的破坏形态、刚度退化以及耗能能力。结果表明:各试件的破坏形态为底部管壁鼓曲,底部一定范围内混凝土出现裂缝;与钢管柱压弯试件相比,钢管混凝土柱压弯试件的屈服承载力和刚度均增大,具有更好的抗震性能;随着轴压力的增大,钢管混凝土柱压弯试件的屈服荷载和刚度均有所减小,抗震性能降低。基于试验数据,采用有限元软件ABAQUS进行分析,分析结果与试验结果吻合较好。在此基础上,利用该数值方法对圆钢管混凝土悬臂长柱进行参数分析,分析结果表明,轴压比和含钢率对圆钢管混凝土柱压弯试件的屈服荷载、水平荷载、耗能能力以及刚度退化均有明显的影响,而混凝土强度等级和钢材强度对其影响较小。
The low-cycle repeated loading test was carried out on the two specimens of cantilever long columns and one column of steel columns. The effects of axial pressure and concrete filling on the seismic performance of the specimens were studied. Load-displacement hysteresis curve, skeleton curve and other seismic performance indicators, the destruction of the specimen morphology, stiffness degradation and energy dissipation capacity. The results show that the failure modes of the specimens are as follows: the tube wall at the bottom is buckled and the concrete cracks at the bottom within a certain range; the yield strength and stiffness of concrete-filled CFST columns are higher than that of the steel tube specimens , With better seismic performance. As the axial pressure increases, the yield load and stiffness of the concrete-filled steel tubular column under bending bending test decrease, and the seismic performance decreases. Based on the experimental data, the finite element software ABAQUS was used to analyze the results and the experimental results were in good agreement. On this basis, the numerical analysis of the parameters of CFST cantilever long columns is carried out. The results show that the yield stress, horizontal load and energy dissipation capacity of CFST columns with axial compression ratio and steel inclusion ratio And stiffness degradation have obvious effects, but the concrete strength grade and the strength of steel has little effect on it.