大直径高强钢筋套筒灌浆连接预制柱抗震性能试验研究

发布时间：2018-05-06 21:43

本文选题：预制混凝土柱 + 钢筋套筒灌浆连接　；参考：《土木工程学报》2017年05期

【摘要】：设计了6个截面尺寸为600mm×600mm的钢筋套筒灌浆连接预制混凝土柱,对其进行了低周反复加载试验,其中配置的纵筋和箍筋均为500MPa级高强钢筋,受力纵筋直径为25mm和36mm。研究了预制柱的破坏形态、滞回曲线、骨架曲线、位移延性、耗能能力以及极限承载力,并分析了轴压比、纵筋直径和配箍形式对其抗震性能的影响。研究结果表明:达到峰值荷载时,500MPa级纵筋均能受拉屈服;试件极限承载力的计算值与试验值之比平均为0.78,具有一定安全度;轴压比为0.50的试件的滞回曲线饱满,而轴压比为0.25的试件,其根部灌浆接缝结合面发生破坏并出现了受力纵筋从套筒中拔出的现象,导致其滞回曲线出现捏拢,耗能能力相对较低;各试件的位移延性系数为3.80~5.31,极限位移角为1/47~1/33,均具有较高的延性水平;通过附加架立筋并配置复合箍的方式可保证大直径钢筋预制柱的抗震性能,并建议优选本文的配箍形式二。
[Abstract]:Six prefabricated concrete columns with 600mm 脳 600mm reinforced sleeve grouting connections were designed and subjected to low cycle repeated loading tests. The longitudinal reinforcement and stirrups are both 500MPa grade high strength steel bars with the diameter of 25mm and 36mm. The failure mode, hysteretic curve, skeleton curve, displacement ductility, energy dissipation capacity and ultimate bearing capacity of prefabricated columns are studied. The effects of axial compression ratio, longitudinal reinforcement diameter and hoop form on their seismic performance are analyzed. The results show that when the load reaches the peak value, the tensile yield of the longitudinal steel bar of 500 MPA can be reached, the ratio of the calculated value of ultimate bearing capacity to the test value is 0.78, and the hysteretic curve of the specimen with axial compression ratio of 0.50 is full, and the calculated value of ultimate bearing capacity of the specimen is 0.78, and the ratio of axial compression to axial compression is 0.50. However, when the axial compression ratio is 0.25, the joint surface of the grouting joint at the root of the specimen is destroyed and the longitudinal reinforcement is pulled out from the sleeve, which leads to its hysteretic curve being squeezed and the energy dissipation capacity relatively low. The displacement ductility coefficient of each specimen is 3.80 ~ 5.31, and the limit displacement angle is 1 / 47 / 1 / 33, which has a high ductility level.
【作者单位】：同济大学;中国建筑科学研究院;
【基金】：“十二五”国家科技支撑计划课题(2011BAJ10B02)
【分类号】：TU352.11

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