With the recent development of material science, high strength steel (HSS) has become a practical solution for landmark buildings and major projects. The current codes for design of bearing-type bolted connections of steel constructions were established based on the research of conventional steels. Since the mechanical properties of HSS are different from those of conventional steels, more works should be done to develop the appropriate approach for the design of bearing-type bolted connections in HSS. A review of the research carried out on bearing-type bolted connections fabricated from conventional steel and HSS is presented. The up-to-date tests conducted at Tongji University on four connection types fabricated from three grades of HSS with nominal yield strengths of 550, 690, and 890 MPa are presented. The previous research on failure modes, bearing resistance and the design with consideration of bolt hole elongation are summarized. It is found that the behavior of bolted connections in HSS have no drastic difference compared to that of conventional steel connections. Although the ductility is reduced, plastic deformation capacity of HSS is sufficient to ensure the load redistribution between different bolts with normal construction tolerances. It is also found that behavior of each bolt of multi-bolt connections arranged in perpendicular to load direction is almost identical to that of a single-bolt connection with the same end distance. For connections with bolts arranged in parallel to load direction, the deformation capacity of the whole connection depends on the minimum value between the end distance and the spacing distances in load direction. The comparison with existing design codes shows that Eurocode3 and Chinese GB50017-2017 are conservative for the design of bolted connections in HSS while AISC 360-16 may overestimate the bearing resistance of bolted connections.

中文翻译：

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高强度钢中轴承式螺栓连接的最新技术

随着材料科学的最新发展，高强度钢（HSS）已成为地标建筑和重大项目的实用解决方案。基于对常规钢的研究，制定了现行的钢结构轴承型螺栓连接设计规范。由于HSS的机械性能与常规钢不同，因此需要做更多的工作来开发用于设计HSS轴承型螺栓连接的合适方法。介绍了对由常规钢和HSS制成的轴承型螺栓连接的研究综述。介绍了在同济大学对由三种等级的HSS制成的四种连接类型进行的最新测试，额定屈服强度分别为550、690和890 MPa。以前关于失效模式的研究，总结了轴承的阻力和考虑螺栓孔伸长的设计。发现与传统的钢连接相比，HSS中螺栓连接的行为没有太大的差异。尽管延展性降低，但高速钢的塑性变形能力足以确保具有正常结构公差的不同螺栓之间的载荷重新分配。还发现，垂直于载荷方向布置的多螺栓连接的每个螺栓的性能几乎与具有相同端距的单螺栓连接的性能相同。对于使用平行于载荷方向布置的螺栓的连接，整个连接的变形能力取决于端部距离与载荷方向上的间距之间的最小值。