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配有高强螺旋箍筋的活性粉末混凝土(RPC)预制管内浇筑混凝土,形成一种新型组合结构——RPC预制管混凝土组合柱(CFRT).对9个不同箍筋间距的CFRT,3个箍筋约束混凝土柱和3个RPC空管开展轴向抗压试验,研究RPC管与内部混凝土之间的组合效应,以及箍筋间距对CFRT轴压性能的影响.结果表明:在荷载峰值下,组合柱中的RPC管没有出现明显的剥落现象,构件截面较为完整;CFRT柱的承载力显著高于对应的箍筋约束混凝土柱和RPC空管两者单独的承载力之和,在承载力上实现了超叠加;CFRT中配置的箍筋间距越小,组合柱的抗压性能越好;基于Mander模型和相应的简化,对CFRT的组合效应进行了分析,RPC管对组合柱的轴向承载力贡献在0.22~0.26之间,且随箍筋间距的增大而有提高的趋势,并提出了CFRT轴向承载力计算方法.
Reactive powdered concrete (RPC) prefabricated concrete with high-strength spiral stirrups is poured into the concrete to form a new type of composite structure - RPC prefabricated concrete composite column (CFRT). For 9 different stirrup spacing CFRTs, 3 stirrups A confined concrete column and 3 RPC empty tubes were used to carry out axial compression tests. The combined effect between RPC tubes and internal concrete was investigated, and the effect of stirrup spacing on the axial compression performance of CFRT was investigated. The results showed that: under the load peak, the combined column The RPC pipe in the middle did not show obvious spalling, and the member section was relatively complete. The bearing capacity of the CFRT column was significantly higher than the sum of the respective bearing capacities of the corresponding stirrup-restricted concrete column and the RPC empty pipe, and the bearing capacity was realized. Superposition; The smaller the stirrup spacing in the CFRT, the better the compressive performance of the composite column; based on the Mander model and the corresponding simplification, the combined effect of the CFRT is analyzed, and the RPC tube contributes to the axial bearing capacity of the composite column. Between 0.22 and 0.26, and with the increase of stirrup spacing, there is an increasing trend, and CFRT axial bearing capacity calculation method is proposed.