装配式体外预应力一字形锚固装置的研究

近年由于产业升级等因素,使用过程中的部分门式刚架需要增加设备,导致屋面荷载增大、钢梁承载力不足,因此需要进行加固。在加固过程中常采用焊接、钻孔等连接方式,为了避免其对原结构钢梁的破坏,设计了一种在门式刚架加固中起连接作用的装配式体外预应力一字形锚固装置,该装置通过钢绞线施加体外应力,在锚固处摩擦挤压实现自锁,改变了原结构的受力状态,以达到加固效果。采用有限元软件ANSYS对该装置节点进行了模拟仿真,分析了该锚固节点的位移、等效应力、接触状态及摩擦应力等受力特征,并通过试验的方法研究了采用该装置加固后,钢梁的应变及挠度的变化情况,并与同等工况下有限元软件MIDAS/Gen的模拟结果进行了对比分析。研究结果表明,该装置安全有效,可以应用于钢梁加固中的锚固连接。

Research on prefabricated external prestressed one font end anchoring device

In recent years, due to the influence of industrial upgrading and other factors, part of the portal frames needed to install equipment in the process of use, which lead to the increase of roof load and inadequate bearing capacity of steel beam. So reinforcement is required. In the reinforcement process, welding, drilling and other connection methods are often used. In order to avoid the damage to steel beam of the original structure, a in-line anchoring device a kind of prefabricated external prestressed one font end anchorage device for the connection of portal frame steel beams was designed. The device applies external stress by steel strands, and frictionally squeezes at the anchoring place to realize self-locking, which changes the stress state of the original structure to achieve the reinforcing effect. The finite element software ANSYS was used to simulate the end node of the device, the force characteristics of the anchored node, such as displacement, equivalent stress, contact state, friction and other force characteristics were analyzed. The variation of strain and deflection of steel beam after the end anchorage device using for reinforcement was studied by experimental methods, and the simulation results of the MIDAS/Gen finite element software were compared and analyzed under the same working condition. The research results show that the device is safe and effective, and can be applied to the anchorage connection of steel beam reinforcement.