不同轴压比装配式RC圆柱抗震性能分析

为研究轴压比对装配式全灌浆套筒连接高强混凝土圆柱抗震性能的影响,采用有限元软件ABAQUS建立装配式钢筋混凝土(RC)圆柱的数值分析模型,并进行验证.在试验参数的基础上,扩大数值模型轴压比的取值范围,研究轴压比对装配式RC圆柱的承载能力、刚度退化及延性性能等抗震性能指标的影响规律.结果表明:模拟得到的破坏形态、骨架曲线与试验结果基本吻合,且精度较高;当轴压比由0.20增至0.90时,试件的屈服荷载、峰值荷载均随轴压比增大而增大,延性性能反而降低,试件的极限位移由67.50 mm减少至31.76 mm,降低约53%;当轴压比大于0.90时,试件的承载能力、延性性能均随轴压比的增加而降低.因此,轴压比对装配式RC圆柱抗震性能的影响较大,在较高轴压比下,装配式RC圆柱仍具有较好的抗震性能.

Analysis on Seismic Performance of Prefabricated RC Column With Different Axial Compression Ratios

In order to study the influence of axial compression ratio on the seismic performance of prefabricated full-grouted sleeve-connected reinforced concrete(RC)circular column, the finite element software ABAQUS was used to establish the numerical analysis model of the prefabricated RC circular column and to verify. On the basis of the test parameters, the value range of the numerical model axial compression ratio was extended, and the influence of the axial compression ratio on the bearing capacity, stiffness degradation and ductility performance of the prefabricated RC circular column was studied. The results show that, the damage shapes and skeleton curves obtained by the simulation are basically consistent with the test results with high accuracy. When the axial compression ratio increases from 0.20 to 0.90, the yield load and peak load of the specimen increase, conversely the ductility performance decreases, and the ultimate displacement of the specimen decreases from 67.50 mm to 31.76 mm by about 53%. When the axial compression ratio is greater than 0.90, the bearing capacity and ductility performance of the specimen decreases with the increase of axial compression ratio. Therefore, the axial compression ratio greatly influences on the seismic ability of the prefabricated RC circular column, and the prefabricated RC circular column still has good seismic performance with high axial compression ratio.