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为研究方钢管再生混凝土中长柱的抗震性能,对6根试件进行定常轴力和水平往复荷载作用下的拟静力试验。研究钢管壁厚、轴压比和长细比3个参数对试件抗震性能的影响,分析各试件的破坏形态、滞回特性、承载力、延性、耗能能力和刚度退化过程。结果表明:钢管壁厚为3.83~5.93 mm时,滞回曲线饱满,延性系数为2.61~3.41,等效黏滞阻尼比为0.361~0.415,变形能力和耗能能力较好;随着钢管壁厚增加,试件的变形、耗能能力和水平承载力提高;随着长细比增大,变形能力和耗能能力有所提高,而水平承载力明显降低;随着轴压比提高,水平承载力稍有提高,而变形能力减小;当轴压比为0.4时,方钢管再生混凝土中长柱的极限位移角达1/28.7,满足GB 50011—2010《建筑抗震设计规范》的层间位移角限值要求。
In order to study the seismic behavior of the long column of square steel tubular recycled concrete, the pseudo-static tests of 6 specimens under constant axial force and horizontal reciprocating load were carried out. The influence of three parameters of steel tube wall thickness, axial compression ratio and slenderness ratio on the seismic performance of the specimens was studied. The failure morphology, hysteretic characteristics, bearing capacity, ductility, energy dissipation capacity and stiffness degradation of each specimen were analyzed. The results show that the ductility curve is full when the wall thickness is 3.83 ~ 5.93 mm, the ductility coefficient is 2.61 ~ 3.41, the equivalent viscous damping ratio is 0.361 ~ 0.415, and the deformation capacity and energy dissipation capacity are good. Deformation, energy dissipation capacity and horizontal bearing capacity of the specimen increased; as the slenderness ratio increased, the deformation capacity and energy dissipation capacity increased, while the horizontal bearing capacity decreased significantly; as the axial compression ratio increased, the horizontal bearing When the axial compression ratio is 0.4, the ultimate displacement angle of the long column of square steel tube recycled concrete reaches 1 / 28.7, which meets the interlayer displacement of GB50011-2010 “Seismic Design Code for Buildings” Angular limit requirements.