大吨位销轴连接节点的静力性能研究

Static Performance of Large Tonnage Pin-Connection Joints

目前销轴连接节点已被广泛运用于实际工程中,但大吨位销轴连接节点足尺试验还较为少见,销轴与耳板间相互作用对节点承载力的影响研究仍有所不足。为研究是否设置内耳板加劲板、销轴制造误差、销轴盖板是否松动等因素对销轴连接节点力学性能的影响,完成了2组2 000吨级的足尺试验和10组有限元模型分析。研究结果表明,加劲板对限制内耳板变形的作用较强,但对限制外耳板相对变形的作用较弱;设置加劲板可以有效降低销轴中部的应力水平,但也将导致销轴端部的应力集中现象加剧;销轴孔和销轴间的间隙增大将导致销轴受压的孔壁出现应力集中现象;销轴盖板的刚度不足将导致销轴的应力水平升高。销轴连接节点在加工制作时需保证销轴孔径的加工精度,在安装时应保证销轴盖板具有足够的刚度且与销轴可靠连接。研究结论可为同类大吨位销轴节点的设计和应用提供参考。

Pin-connection joints have been widely used in practical engineering,but the full-scale test of large tonnage pinconnection joints is still rare.The study on the interaction between pins and trunnion plates and its impact on the load-bearing capacity is still insufficient.To investigate the effects of factors such as the installation of internal stiffeners,manufacturing errors of pins,and looseness of pin cover plates on the mechanical properties of pinconnection joints,two full-scale 2000 tons specimens were tested and ten finite element models were analyzed.The results show that the stiffener has a more significant effect on limiting the deformation of the inner trunnion plate.However,the stiffener has a weaker effect on limiting the relative deformation of the outer trunnion plate.The stiffener can effectively reduce the stress level at the middle of the pin,but it will also exacerbate stress concentration at the end of the pin.Increasing the gap between the pin and pinhole will result in stress concentration on the pinhole wall under the compression of pin.Insufficient stiffness of the pin cover plate will increase the stress level of the pin.The machining accuracy of the pinhole should be ensured during manufacturing.During installation,it should be ensured that the pin cover plate has sufficient stiffness and is reliably connected to the pin. The research conclusions of this paper can provide a reference for the design andapplication of similar large tonnage pin-connection joints.