ABSTRACT The perfobond connector is the most widely used connector in the steel-concrete joint, and its shear behavior is different from that of perfobond connectors in steel-concrete composite beams. However, because of the limitations of the parameters considered in previous tests and the difficulty of measuring the internal stress states of test specimens, the force transfer mechanisms of perfobond connectors in steel-concrete joints remain unclear. To clarify shear behavior of perfobond connectors in the steel-concrete joints of hybrid bridges, an effective finite element model of push-out testing is developed. Finite element analysis results indicated that: the dilatancy effect of concrete dowel causes concrete cracking, and the shear capacity of connectors is mainly controlled by the confinements of structural reinforcement in the y direction. In the case of weak confinements from structural reinforcement, the confinement effects of friction force at the bottom of a specimen significantly affects the mechanical properties of concrete dowels. Pressure fields can slightly enhance the shear capacity of connectors, whereas tension fields can significantly reduce the ultimate shear capacity of connectors. With an increase in confinements, the shear and tension forces of the perforating rebar in the ultimate state gradually shift toward pure shear forces. Because of the separation of steel-concrete interfaces caused by the dilatancy of concrete dowels, the contribution of interface bond friction to the shear capacity of connectors should be considered as a safety reserve.

中文翻译：

---

混合桥梁钢-混凝土接头中perfobond连接件的剪切行为

摘要 穿孔钢连接件是钢-混凝土节点中应用最广泛的连接件，其抗剪性能与钢-混凝土组合梁中的穿孔钢连接件不同。然而，由于以往试验中考虑的参数的局限性以及难以测量试样的内应力状态，钢-混凝土接头中perfobond连接件的力传递机制仍不清楚。为了阐明混合桥梁钢-混凝土接头中 perfobond 连接件的剪切行为，开发了一种有效的推出试验有限元模型。有限元分析结果表明：混凝土销钉的剪胀效应导致混凝土开裂，连接件的抗剪承载力主要受 y 方向结构钢筋的约束。在结构加固弱约束的情况下，试样底部摩擦力的约束效应显着影响混凝土销钉的机械性能。压力场可以略微增强连接件的抗剪能力，而张力场可以显着降低连接件的极限抗剪能力。随着约束的增加，穿孔钢筋在极限状态下的剪力和拉力逐渐向纯剪力转变。由于混凝土销钉的剪胀引起钢-混凝土界面的分离，