Abstract
In order to analyze the quantitative influence of the axial compression ratio on the seismic performance of reinforced concrete (RC) frame column, this paper carried out the numerical analysis of the quasi-static simulation of a RC frame column and analyzed its hysteresis performance, bearing capacity, stiffness degradation, energy consumption capacity and ductility capacity under different axial compression ratios, based on OpenSees finite element software, considering the buckling and fatigue damage model. The results show that the smaller the axial compression ratio, the fuller the hysteresis curve and the slower the stiffness degradation of the column. The ultimate bearing capacity of the column increases by 24.6% when the axial compression ratio increases from 0.3 to 0.8, but bearing capacity decreasing and stiffness degradation is faster and faster. When the deformation does not exceed the ultimate displacement, the equivalent viscous damping at each displacement level of high axial compression ratio column is greater than that of the low axial compression ratio, but the total hysteretic energy decreases about 64.2% at maximum amplitude. The ultimate displacement gradually decreases with the increase in the axial compression ratio, and the ductility factor decreases about 55.9% at maximum amplitude. The results can be referenced by the seismic design and analysis of RC frame.
Highlights
In order to analyze the quantitative influence of the axial compression ratio on the seismic performance of reinforced concrete (RC) frame column, this paper carried out the numerical analysis of the quasi-static simulation of a RC frame column and analyzed its hysteresis performance, bearing capacity, stiffness degradation, energy consumption capacity and ductility capacity under different axial compression ratios, based on OpenSees finite element software, considering the buckling and fatigue damage model
The ultimate bearing capacity of the column increases by 24.6% when the axial compression ratio increases from 0.3 to 0.8, but bearing capacity decreasing and stiffness degradation is faster and faster
The results show that the smaller the axial compression ratio, the fuller the hysteresis curve and the slower the stiffness degradation of the column
Summary
In order to analyze the quantitative influence of the axial compression ratio on the seismic performance of reinforced concrete (RC) frame column, this paper carried out the numerical analysis of the quasi-static simulation of a RC frame column and analyzed its hysteresis performance, bearing capacity, stiffness degradation, energy consumption capacity and ductility capacity under different axial compression ratios, based on OpenSees finite element software, considering the buckling and fatigue damage model. 针对RC框架结构抗震性能及抗倒塌能力,国内外学 者开展了广泛的研究。陆新征等[1]为研究汶川地震中RC 框架结构地震破坏机理,开展了RC框架整体结构、节点 及轴压比不同的边柱和中柱的拟静力倒塌试验,并将试验 结果进行了公开,为检验结构及构件数值模拟分析方法提 供了基础。Yao等[2]研究轴压比的增大对超高强钢筋混凝 土框架结构抗震性能的影响。观察到随着轴压比从0.5增 大到0.75和0.9,框架柱破坏模式从弯曲破坏变为弯曲粘结 破坏,并进一步扩展为弯曲劈裂破坏。轴压比不断增大, 伴随着强度、刚度和耗能能力的变化,框架结构的抗震性 能降低。 白巨巨等[3]研究不同轴压比RC柱—钢梁组合件抗震 性能,得出在一定范围内,提高轴压比可以增大组合件承 载力,在高轴压比下,承载力略微降低。轴压比不断增大, 组合件等效黏滞系数总体呈增大趋势。蔡健等[4]分析轴压 比对组合剪力墙抗震性能的影响,完成了5个缩尺模型试 件的拟静力试验。发现轴压比为0. 冯宝锐[5]对9根轴压比分别为0.69、0.89、0.97、1.05 等的RC框架柱进行了抗震性能试验研究,建立了框架柱 在地震作用下抗震性能点及损伤状态特征点与弹塑性转 角的关系,为判别柱的损伤状态提供了参考依据。得出抗 震等级相同的RC框架柱试件,轴压比高的框架柱的破坏 程度比轴压比低的框架柱的破坏程度严重的结论。 Sun等[6]对玻璃纤维聚合物增强RC柱进行拟静力试 验,将轴压比从0.3增大到0.45,再增大到0.6。柱的破坏 模式从弯剪破坏变为弯曲破坏,轴压比大于0.45为弯曲破 坏。柱极限承载力分别增加8.42%和21.49%,极限变形分 别 减 少 5.56% 和 11.76% , 累积耗能分别降低 43.56% 和 7.79%。
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