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在对国内外对装配式结构节点的研究基础上,提出了装配式钢管混凝土柱-带钢接头钢筋混凝土梁节点,进行了6个足尺节点模型的低周往复加载试验,得到了不同类型节点的破坏特征、荷载-位移滞回曲线、骨架曲线、刚度退化曲线及延性等性能。试验结果表明:采用钢接头连接的节点的抗震性能都较好,节点具有很好的延性(平均位移延性系数为3.08);节点区域基本完好,破坏发生在梁钢筋区域;节点的滞回曲线呈反“S”形或“Z”形,带楼板的节点以及梁下部配置钢板的节点在拉、压两个方向的滞回曲线差别较大,承载力和刚度明显高于其他节点,强度退化较为明显;节点转动时,纵向受拉钢筋先屈服,随后受压边缘混凝土被压碎;楼板对节点内钢筋应变的影响非常大,尤其是在正向加载时,其贡献作用更大。
Based on the domestic and foreign research on the nodes of fabricated structure, the joints of the prestressed concrete filled steel tubular column with steel bar are put forward, and the low-cycle reciprocating loading tests of six full-scale nodes are carried out. Different types of nodes The failure characteristics, the load-displacement hysteresis curve, the skeleton curve, the stiffness degradation curve and the ductility and other properties. The experimental results show that the joints with steel joints have better seismic performance and the joints have good ductility (the average displacement ductility coefficient is 3.08). The node area is basically intact and the damage occurs in the beam reinforcement area. The hysteresis curve of the joint The hysteretic curves of the inverted “S” shape or “Z” shape, the nodes with slabs and the steel plates arranged at the lower part of the beams are greatly different in the pull-pressure and pressure directions, and the bearing capacity and stiffness are obviously higher than those of the other nodes , The strength degeneration is more obvious. When the node rotates, the longitudinal tensioned steel first yields, then the concrete under pressure is crushed. The influence of the slab on the steel bar strain in the joint is very large, especially in the positive loading .