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常用的摩擦式高强螺栓是靠螺栓的预拉力使钢件产生摩擦力,从而传递荷载的。一般都把接头的滑动荷裁定为接头设计的极限荷载,因而在工作荷载作用下接头滑动的机率很小。当继续加荷到接头发生滑动后,螺栓杆身与孔壁开始接触,将由摩擦力和螺栓杆身的剪-压作用共同传力。直到连接件产生较大的塑性变形或接近破坏荷载时,摩擦力才会因螺栓预拉力的大幅度减小而显著下降,转为主要由螺栓杆身来承担荷载。以螺栓杆身剪断或板壁破坏时的荷载作为设计的极限荷载的螺栓连接称为剪-压式高强螺栓连接。显然,剪-压式高强螺栓连接的设计
The commonly used friction type high-strength bolts rely on the pretension of the bolts to cause the steel pieces to generate frictional forces, thereby transmitting the load. Generally, the sliding load of the joint is determined as the ultimate load of the joint design, so the probability of the joint sliding under the working load is very small. When the loading is continued until the joint slips, the bolt shaft comes into contact with the wall of the hole, and the friction and the shear-pressure action of the bolt shaft jointly transmit the force. Until the connector produces a large plastic deformation or near failure load, the friction force will decrease significantly due to the large reduction in the pretension of the bolt, and it will be mainly the bolt shaft to bear the load. Bolt joints sheared or bolted to the wall of the bolt body as the designed ultimate load are called shear-pressure high-strength bolt connections. Obviously, shear-pressure high strength bolted design