In this study, FEM was conducted to clarify the mechanical behavior and applicability of conventional design formulas for tensile type bolted joint using 1700MPa-class ultra-high-strength bolts. The 1700MPa-class bolts significantly improve the initial stiffness, the yield strength, the maximum strength and the deformation performance of tensile type joints compared to conventional high-strength bolts. Additionally, the conventional design formulas conservatively estimate the yield and maximum strength and bolt axial force of the joints using 1700MPa-class bolts.
