Table A1. Minimum Anchor Rod Pretension for Double-Nut-Moment Joints Anchor Rod Diameter, in.
a b
Minimum Anchor Rod Pretension Tm, kips ASTM F1554 Rod Grade 36a
ASTM F1554 Rod Grade 55b
ASTM F1554 Rod Grade 105b
ASTM A615 and A706 Bars Grade 60b
�
4
6
11
7
s
7
10
17
11
w
10
15
25
16
d
13
21
35
22
1
18
27
45
29
18
22
34
57
37
1�
28
44
73
47
1�
41
63
105
67
1w
55
86
143
91
2
73
113
188
–
2�
94
146
244
156
2�
116
180
300
–
2w
143
222
370
–
3
173
269
448
–
3�
206
320
533
–
3�
242
375
625
–
3w
280
435
725
–
4
321
499
831
–
Equal to 50% of the specified minimum tensile strength of rods, rounded to the nearest kip. Equal to 60% of the specified minimum tensile strength of rods, rounded to the nearest kip.
Table A2. Nut Rotation for Turn-of-Nut Pretensioning of UNC Threads Nut Rotation a,b,c Anchor Rod Diameter, in. ≤1� >1�
F1554 Grade 36
F1554 Grades 55 and 105 A615 Grade 60 and 75 and A706 Grade 60
6 turn
3 turn
1 /12 turn
6 turn
1
Nut rotation is relative to anchor rod. The tolerance is plus 20°. b Applicable only to UNC threads. c Beveled washer should be used if: 1) the nut is not into firm contact with the base plate; or 2) the outer face of the base plate is sloped more than 1:40. a
52 / DESIGN GUIDE 1, 2ND EDITION / BASE PLATE AND ANCHOR ROD DESIGN