高强度螺栓的承受能力有多大用高强度钢制造的,或者需要施以较大预紧力的螺栓,皆可称为高强度螺栓.高强度螺栓多用于桥梁、钢轨、高压及超高压设备的连接.这种螺栓的断裂多为脆性断裂.应用于超高压设备上的高强度螺栓,为了保证容器的密封,需要施以较大的预应力关于高强度螺栓的几个概念1.按规定螺栓的性能等级在8.8级以上者,称为高强度螺栓.现标准只罗列到M39,对于大尺寸规格,特别是长度大于%10~15倍的高强度螺栓,国内生产尚属短线高强度外六角螺栓高强度T型槽螺栓。
More specifically: High-strength bolt connection has the advantages of simple construction, good mechanical performance, detachability, fatigue resistance, and no loosening under dynamic load, and it is a promising connection method.High-strength bolts are used to tighten the nut with a special wrench, so that the bolt generates a huge and controlled pretension. Through the nut and the backing plate, the same amount of prestress is also generated on the connected parts.Under the action of pre-pressure, a relatively large friction force will be generated along the surface of the connected part. Obviously, as long as the axial force is less than this friction force, the component will not slip and the connection will not be damaged. This is a high-strength bolt connection. The principle.High-strength bolt connections rely on the friction between the contact surfaces of the connectors to prevent them from sliding. In order to make the contact surfaces have sufficient friction, the clamping force of the components and the friction coefficient of the contact surfaces of the components are increased.The clamping force between the components is achieved by applying pretension to the bolts, so the bolts are made of high-strength steel, which is why it is called a high-strength bolt connection.In the high-strength bolt connection, the friction coefficient has a great influence on the bearing capacity.Tests show that the friction coefficient is mainly affected by the form of the contact surface and the material of the component.In order to increase the coefficient of friction of the contact surface, methods such as sandblasting and wire brush cleaning are often used to treat the contact surface of the components within the connection range during construction.There are actually two types of high-strength bolts: friction type and pressure-bearing type.The criterion for friction-type high-strength bolts to withstand the shear force is that the shear force caused by the design load does not exceed the friction force.Pressure-bearing high-strength bolts are designed based on the fact that the shaft is not damaged by shearing or the plates are not crushed.