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采用有限元软件模拟地震作用下型钢混凝土柱(SRC)的受力性能,首先将模拟结果与试验结果进行对比,在确保建立模型正确性的基础上,模拟和分析了单、双轴路径加载下轴压比、配钢形式、加载路径、位移幅值循环次数、变轴力等因素对型钢混凝土柱抗震性能的影响。研究结果表明:截面配钢形式对柱抗震性能有较大影响;大轴压比下柱延性小,耗能差,对抗震不利,且大轴压比双轴路径下柱的抗震性能比单轴路径下更为不利;双轴加载路径下柱峰值强度和延性明显较单轴加载路径下的低,但双轴加载路径下柱的总耗能大于单轴时的总耗能;在轴压比n=0.3的单、双轴加载路径下,位移幅值循环次数对柱骨架曲线的影响不显著,但对耗能有较大影响;在变轴力作用下,柱受力性能表现出明显的不对称性,延性小。
The finite element software was used to simulate the mechanical behavior of SRC columns. First, the simulation results were compared with the experimental results. On the basis of ensuring the correctness of the model, the effects of single and biaxial path loading Axial compression ratio, distribution steel form, loading path, displacement amplitude cyclic number, variable axial force and other factors on the seismic behavior of SRC columns. The results show that the cross-section steel distribution has a great influence on the seismic performance of the column. Under large axial compression ratio, the columnar ductility is small, the energy dissipation is poor, which is unfavorable to the earthquake resistance. Under the biaxial loading path, the peak strength and ductility are obviously lower than those under the uniaxial loading path, but the total energy loss of the column under the biaxial loading path is larger than that of the uniaxial loading path. When the axial compression ratio Under the single-axis and biaxial loading paths of n = 0.3, the amplitude of cyclic displacement has no significant effect on the curve of the column skeleton, but has a significant effect on the energy dissipation. Under variable axial load, Asymmetry, ductility small.