Key Points For Bolt Design And Selection

6.3 In order to simplify the design and facilitate the correct selection of various types of anchor products, a clear understanding of the same conditions and a reasonable distinction between the performance indicators of the anchor products, the anchor bolt bearing capacity design values listed in the enterprise product technical data are based on non-structural The components, C20 cracked concrete, c1 = ccrN, s1 = scrN and other conditions are calculated and determined by the simplified calculation method in the national building standard design atlas "Concrete post-anchor connection structure". When the anchor bolt usage conditions do not conform, it shall be modified according to the simplified calculation method of anchor bolt bearing capacity provided in the atlas.

6.4 The anchoring connection of structural members under tension, edge shear, and tension-shear combination and non-structural components of lifeline engineering should be controlled as anchor bolts or steel bar planting damage, and should not be controlled as concrete base material damage; for expansion type anchor bolts and For the anchoring connection of the reamed anchor bolt, the overall pull-out failure should not occur, and the bolt penetration failure should not occur; for the bonded anchor bolt, the pull-out failure should not occur; for the chemical planting bar and screw that meet the anchoring depth requirements, it is not The concrete base material damage and pull-out damage should occur (including damage along the rubber bar interface and glue-mixed interface).

6.5 The bearing capacity of the anchor bolt connection considering the combination of seismic action shall be calculated according to formula (1.6.5-1). Friction shall not be used as resistance against the effects of earthquakes.

S≤kR∕γRE (1.6.5-1)

In the formula, S—the basic combination of the seismic effect of anchoring connection and other load effects;

R—design value of anchor bolt connection bearing capacity when bearing static load;

γRE—Seismic adjustment coefficient of bearing capacity, taking γRE = 1;

k—The reduction coefficient of the anchor bolt connection bearing capacity when considering the combination of seismic action shall be provided by the anchor bolt manufacturer after passing the system test certification. In the absence of system test, it can be adopted according to Table 6.5-1.