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网架结构的应用日趋广泛,结构型式已从单一的平板网架发展到各种网壳和组合式网架。但节点零件的设计却显得“驻足不前”。1991年发布的行业标准中所介绍的仍是十几年前采用过的节点联接件——有销(或螺钉)式高强螺栓配用六角形套筒。多年来大量工程实践证明,这种联接件由于在螺栓上开孔或槽,造成受力截面减小,并产生应力集中,这些都会直接影响其承载时的安全性。它在安装时是靠一种M6的小螺钉或销,把套筒装配在管杆
The application of the grid structure has become increasingly widespread, and the structural types have evolved from a single flat grid to a variety of net shells and modular grids. However, the design of node parts seems to be “stopped.” The industry standard that was released in 1991 is still the node connector that was used more than ten years ago—a high-strength bolt with bolt (or screw) is equipped with a hexagonal sleeve. Over the years, a large number of engineering practices have proved that this kind of coupling parts will reduce the force cross section and cause stress concentration due to the holes or grooves in the bolts, which will directly affect the safety when it is carried. It is mounted with a M6 screw or pin to fit the sleeve to the pipe