【作者】 黄婷婷；

【导师】 郭子雄；

【作者基本信息】 华侨大学 ， 结构工程， 2016， 硕士

【摘要】 结构震损快速修复和建筑功能快速恢复是建筑工业化的重要研究方向之一。针对装配式RCS混合结构在强烈地震作用下难以避免出现底层柱脚严重塑性损坏,提出一种性能可恢复装配式组合柱,由柱底部的可更换消能柱脚和RC上柱段组成,并开展了新型组合柱的震损更换措施和抗震性能试验研究。通过对1个整浇RC柱和8个足尺新型组合柱的低周往复加载试验,考虑不同加载历史和接触设置,研究了轴压比、可替换钢板面积、填充块体材料等参数对组合柱抗震性能的影响。试验研究表明:(1)替换前4个组合柱的损伤均出现在柱脚可更换消能部件上,RC上柱段处于弹性状态;替换后4个组合柱在1/25位移角时可替换钢板均出现严重屈曲破坏,RC上柱段轻度损伤,纵筋屈服较轻,实现了预期的破坏模式;(2)组合柱具有和整浇RC柱相匹配的承载能力和耗能能力,初始刚度相近,延性良好,说明组合柱结构构造合理,受力性能良好;(3)组合柱在震损更换后的承载能力和变形能力与更换前的试件基本相同,实现了结构的性能可恢复要求;(4)随着轴压比的增大,试件耗能能力和承载力得到提高,而可更换消能部件的损伤程度则加大。(5)相比高强灌浆料的受压脆性性能,UHTCC材料在试验中表现出了良好的韧性和变形能力,减轻试件损伤程度,使试件的滞回性能稳定,耗能能力较好。运用有限元软件ABAQUS对性能可恢复装配式组合柱进行数值模拟,有限元计算结果与试验结果吻合良好,能较好地反应拼装节点区受力特性。在有限元模型验证的基础上,对试验组合柱进行参数分析,分别研究了轴压比、可替换钢板钢材强度对组合柱骨架曲线的影响。更多还原

【Abstract】 It has become a significant research focus for structures to achieve the function of rapid rapair after earthquake in the building industrialization filed. An innovative earthquake-resilient prefabricated composite columns, which include the replaceable energy-dissipation parts and the RC columnial segment, was proposed for prefabricated RCS bottom columns which might be more prone to get damaged during strong earthquakes. The replacing measures and the seismic performance of the innovative composite column was experimentally studied.A poured RC column and eight full sized composite columns were tested under low cyclic loading to investigate the influence of the details of axial load ratio, area of the replaceable steel plate, the padding lump’s material and the contact setting method on the seismic performance of the specimens. The results showed that:(1) The damage of the composite column concentrated in the replaceable energy-dissipation parts with the RC columnial segment keep in elastic state before the replacement. In the late loading after the replacement, the replaceable steel plates got seriously buckling damage while the RC columnial segment was damaged lightly and the longitudinal reinforcement was also just light yielded. The expected failure mode was achieved;(2) Compared with the poured RC column, the composite columns has considerable bearing capacity, energy dissipation capacity, and initial stiffness,meanwhile the composite columns showed well ductility. That indicated that the composite column has a good mechanical perform with rational constructions.(3) The load and deformation capacity of the composite columns replaced after damaged were almost at the same level as the corresponding specimens before 1/50 story drift.(4) The bearing capacity and energy dissipation capacity of the composite columns increase as the axial compression ratio increases. But the damage of the replaceable energy-dissipation parts at the column bottom was increasing.(5) Compared with the brittle behavior of the high strength grouting material, the UHTCC performed good compressive ductility and plastic deformation capacity. It can lighten specimens’ damage and is good for the hysteretic behavior stability and the energy dissipation.Nonlinear numerical simulation under monotonic loading on the composite column was carried out by ABAQUS program, showing good agreement with the test results, and the established finite element analytical model can accurately predict the mechanical behavior of the composite columns. The influences of axial compression ratio and strength of the replaceable steel plate to the skeleton curves of the composite columns were studied by numerical calculation.更多还原