Research and Development of Large-Diameter Bolted Spherical Joints for Spatial Grid Structures and the Compilation of Their Standards

In order to meet the application requirements of super-long-span spatial grid structures for large-diameter bolted spherical joints， M90×6 to M120×6 large-diameter bolts were designed. Uniaxial tensile tests were conducted on ten full-scale M100×6 specimens and nine machined M120×6 specimens. The test results showed that their mechanical property indicators all met the requirements. The corresponding tapered heads for M90×6 to M120×6 large-diameter bolts were also designed， and their tensile and stress properties were investigated using ABAQUS. The simulation results validated the rationality of the tapered head design. Based on the above research and development outcomes， the standard for M90×6 to M120×6 large-diameter bolts was successfully applied for project approval and compiled.