《Table 1 De sign value of GB 50017—2017 high-stre ngth bolt pre te nsion》

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《中美建筑钢结构设计方法比较——螺栓连接》

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According to tightening methods used in installing bolted connections，the bolts can be installed w ith or w ithout pretension.It is not necessary to apply pretension w hen using ordinary bolts，and snug-tightened w ould be adequate.Current national standards GB 50017—2017 and GB 50755—2012[14]require that pretension should be applied for high-strength bolts and the specified design values of pretension of bolts are show n in Table 1.AISC360-16 allow s the structural engineers to determine w hether pretension is required according to the loading conditions of the bolted connection.Normally pretension is required for bolted connection under dynamic and fatigue loads，as w ell as for high-strength bolts subjected to combined tension and shear[4].High-strength bolts are classified into three groups（Grade A （830 M Pa），Grade B （1 040 M Pa）and Grade C（1 380 M Pa））in AISC360-16 according to the material strength.Group A bolts are equivalent to Grade 8.8 in China，w hile Group B bolts are equivalent to Grade 10.9.Table 2 show s the minimum high-strength bolt pretension specified in AISC360-16.The comparison betw een Table 1 and Table 2 show s that the pretension of high-strength bolts specified in AISC 360-16 is about 15%higher than that of GB 50017—2017.