What are the misunderstandings of high-strength bolts?

2023/07/30

English translation of high-strength bolts is: high-strength friction torque bolts, English abbreviation: HSFG. It can be seen that the high-strength bolts that we often say in the Chinese construction process are the general term for high-strength friction torque bolts. In daily communication, the two words "Friction" and "Grip" are simply used, but many engineering project technicians have a basic understanding of the definition of high-strength bolts, resulting in misunderstandings. Special bolt manufacturers to interpret. Misunderstanding 1: Bolts with a material grade exceeding 8.8 are "high-strength bolts"? The key difference between high-strength bolts and ordinary bolts is not the compressive strength of the applied material, but the way the force is received. The essence is whether to increase the preload and use static friction to resist bending. Misunderstanding 2: The bearing capacity of high-strength bolts is higher than that of ordinary bolts. Is it "high-strength"? According to the calculation of individual bolts, the compressive strength and bending strength of high-strength bolts are lower than those of ordinary bolts. Its high-strength essence is: when everything is running normally, the nodes are not allowed to produce any relative movement, that is: the elastic-plastic deformation is small, and the bending stiffness of the nodes is large. It can be seen that: in the case of a given design node load, using high-strength bolts to design nodes does not necessarily save the number of bolts used, but its deformation is small, the bending stiffness is large, and the safety reserve is high. It is suitable for load-bearing beams and other parts with high bending stiffness of the specified joints, which are in line with "strong joints". The strength of high-strength bolts does not depend on the design value of its own bearing capacity, but is mainly reflected in the bending stiffness of the design joints. Large, high safety factor, strong damage resistance. For a seemingly simple problem, it is not a simple thing to understand deeply, comprehensively and properly from its essence. High-strength bolts The difference from the definition, meaning, and profound meaning of ordinary bolts is the basic prerequisite for everyone to correctly understand, apply high-strength bolts, and carry out engineering construction management.

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