圆钢管混凝土柱-预应力钢筋混凝土梁混合连接节点抗震性能研究
李贝贝 , 刘奥 , 王静峰 , 曹瑞雪 , 贡宏要
建筑钢结构进展 ›› 2026, Vol. 28 ›› Issue (01) : 1 -9.
圆钢管混凝土柱-预应力钢筋混凝土梁混合连接节点抗震性能研究
Seismic Performance of Hybrid Connection Joints Between RCFST Column and PRC Beam
为研究圆钢管混凝土(round concrete-filled steel tubular, RCFST)柱-预应力钢筋混凝土(prestressed reinforced concrete, PRC)梁混合连接节点的抗震性能,文中依托某高铁站候车层的RCFST柱-PRC梁大跨度结构,设计了两个缩尺比例为1∶5的混合连接节点试件,并对其开展了低周往复加载试验研究,分析了有无工字钢牛腿试件的破坏模式、延性、刚度退化和滞回耗能能力。采用ABAQUS有限元软件建立了精细化的有限元分析模型,经试验结果验证模型的有效性后,分析了轴压比、预应力水平、梁端混凝土截面含钢率及混凝土强度对混合连接节点受力性能的影响规律。结果表明:混合连接节点的破坏模式主要为与环梁交界处的主梁出现明显的塑性铰。相比无工字钢牛腿试件,有工字钢牛腿试件的滞回曲线更为饱满,且峰值荷载和延性分别提高了16.76%、5.6%,表明设置工字钢牛腿可以有效提高混合连接节点的抗震能力。轴压比、预应力水平、梁端混凝土截面含钢率和混凝土强度对混合连接节点的初始刚度无显著影响;节点承载力与轴压比呈负相关,与预应力水平、梁端混凝土截面含钢率和混凝土强度呈正相关,其中合适的预应力水平可有效提升节点的承载能力,因此,基于文中RCFST柱-PRC梁混合节点的构造形式,建议预应力水平在设计时取0.7。
In order to study the seismic performance of hybrid connection joints between the round concrete-filled steel tubular (RCFST) column and prestressed reinforced concrete (PRC) beam, two hybrid connection joints with a scale ratio of 1∶5 were designed based on a long-span RCFST column to PRC beam structure in the waiting floor of a high-speed railway station. A low-cycle reversed loading test was conducted on the two specimens with or without I-shaped steel corbels, to analyze the failure mode, ductility, stiffness degradation and energy dissipation. A refined finite element analysis model was established by ABAQUS software, and on the basis of the verification of the test results, the influence of axial compression ratio, prestress level, steel ratio of beam section and concrete strength on the mechanical performance of hybrid connection joints was analyzed. The results showed that the failure mode of the hybrid connection joint was mainly the obvious plastic hinge appeared between the end of the main beam at the junction with the ring beam. Compared with the specimen without I-shaped steel corbel, the hysteresis curve of the specimen with I-shaped steel corbel was fuller, and the peak load and ductility were increased by 16.76% and 5.6%, respectively, indicating a significant improvement in the seismic performance of the hybrid connection joints. There was almost no relationship between the initial stiffness of the hybrid connection joints and the axial compression ratio, the prestress level, steel ratio of beam section and concrete strength, while the bearing capacity of the hybrid connection joints was negatively correlated with the axial compression ratio, and was positively correlated with the remaining three parameters. Meanwhile, an appropriate prestress level can improve the bearing capacity of the joint. Therefore, based on the hybrid joint member form of RCFST column and PRC beam, it is suggested that a prestress level of 0.7 be adopted in the design of the PRC beam.
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安徽省科技创新平台重大科技项目(202305a12020013)
中央高校基本科研业务费专项资金项目(123456789123)
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