A fastener composed of an elliptical head and a screw rod component.
The elliptical bolt is a fastener composed of an elliptical head and a threaded rod with external threads. It is a non-standard part in the field of mechanical components. This bolt is mainly used as a key connecting component in the net frame structure with bolted spherical joints. In the application of the net frame structure, this bolt demonstrates technical advantages such as high spatial stiffness and good seismic performance. Through standardized connections, the structural force is made clear. The new elliptical head unilateral bolt is applied to the semi-rigid joint connection between H-shaped steel beams and square steel tube columns. The initial stiffness of the M20 specification is increased by 21.85% compared to the M16 specification, and the ultimate bearing capacity is increased by 8.68%. In the field of railway rail anti-theft, long elliptical spherical bolts are used. The head and the threaded rod are connected through forward threads, and the anti-theft function is achieved by cooperating with a special wrench. The failure mode of the node failure pattern 2.3% is mainly manifested as the fracture of the bolt head, and the influence of the axial compression ratio change on the bearing capacity is less than
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