装配式钢质塑性可控铰抗震性能试验研究

装配式混凝土结构节点及其连接是抗震薄弱环节,有必要发展高性能的节点及其连接形式,为此,提出一种装配式塑性可控、可更换部件的钢质塑性可控铰连接节点,并对该节点关键耗能部件——钢质塑性可控铰进行低周往复荷载试验,考察其弯矩-转角滞回曲线、骨架曲线、承载能力、转动刚度、破坏模式、延性、能量耗散能力等抗震性能,研究翼缘核心板开...

Experimental study on seismic performance of plastic controllable prefabricated steel hinges

The joints and connections of prefabricated concrete structures are weak links in an earthquake when compared with those of cast-in-place structures. It is necessary to develop innovative forms of joints and connection with high performance. To this end, a novel-type prefabricated joint with plastic controllable and replaceable steel hinges was proposed, in which the steel hinges were the key energy-dissipating component of the prefabricated joint. The low-cycle reversed loading test on the plastic controllable steel hinges was carried out to explore the moment-rotation hysteretic curve, skeleton curve, bearing capacity, rotational stiffness, failure mode, ductility and energy dissipation capacity. In addition, the influence of weakening by hole section of the flange core plate on the seismic performance of steel hinges was investigated. The results show that the hysterestic curves of the steel hinges in which the flange core plates are weakened by elliptical hole or by diamond-shaped hole are full. Both the steel hinges have large energy dissipation, good ductility and insignificant bearing capacity degradation. Plastic deformation starts from the most weakened section of the flange core plate and develops to the two ends of the opening. The flange core plate finally cracks or fractures at the most weakened section, achieving the controllability of plasticity and failure modes. All these ductility, cumulative hysteretic energy dissipation, bearing capacity degradation performance, and rotation ability of the elliptical-hole weakened steel hinge are better than those of the diamond-shaped-hole weakened steel hinge, but the initial rotational stiffness of the former is less than that of the latter.