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Notice: Unless otherwise noted, all load and design values presented herein are based on the provisions of ACI 349-97 or earlier. Design guidance based on ACI 318-05 and ACI 349-06 is being prepared and will appear here shortly. In the mean time you may wish to review the results of cracked concrete testing performed in accordance with ACI 355.2 as called for in the new codes.
The following load and spacing tables have been extracted from ICBO Evaluation Report 4133 as a quick reference. For the complete report see: ICBO Evaluation Report 4133.
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NOTES:
1. Case 1 applicable for grouted plates. Case 2 applicable for plates
in contact with concrete surface.
2. Use straight line interaction for combined tension and shear loading.
3. All load allowables are premised on the anchor's ability to develop
100 percent of the stud bolt's minimum ultimate capacity. Table No. II
specifies combinations of concrete compressive strength, anchor embedment,
center-to-center spacing and edge distance which will allow the anchor
to develop its ultimate capacity.
4. The allowable loads noted in the above table may be assigned to
each anchor in a multiple-anchor attachment. A single anchor used to anchor
an attachment shall be designed for one half of the allowable loads noted.
TABLE NO. II-EMBEDMENT AND CENTER-TOCENTER SPACING REQUIREMENTS
FOR UP TO SIX MAXI-BOLTS IN A RECTANGULAR PATTERN
|
STUD DIAMETER (Inches) |
ATTACHMENT THICKNESS (Inches) |
(Inches) |
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Center to Center Spacing (Inches) |
Edge Distance (Inches) |
Center to Center Spacing (Inches) |
Edge Distance (Inches) |
Center to Center Spacing (Inches) |
Edge Distance (Inches) |
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MB-250-4 1/4-2
MB-250-4 1/4-2 3/4 |
1/4 |
1.00 |
2 3/4 |
6.00 |
4.50 |
5.00 |
4.25 |
4.50 |
4.00 |
MB-375-6-3 1/2
MB-375-6-4 1/2 |
3/8 |
1.50 |
4 1/2 |
9.00 |
6.75 |
7.50 |
6.25 |
6.50 |
6.00 |
MB-500-8 1/4-6
MB-500-11 1/4-8 MB-500-13 1/4-10 |
1/2 1/2 |
2.00 2.00 |
8 10 |
8.50 6.00 |
8.75 8.75 |
7.00 4.50 |
8.25 8.25 |
6.00 4.00 |
7.75 7.75 |
MB-625-10-7 1/2
MB-625-13-9 1/2 MB-625-16-12 |
5/8 5/8 |
2.25 2.75 |
9 1/2 12 |
11.50 8.00 |
11.00 11.00 |
9.50 6.50 |
10.25 10.25 |
8.50 5.50 |
9.75 9.75 |
MB-750-13 1/2-9 1/4
MB-750-16 1/2-11 1/2 MB-750-18 1/2-13 |
3/4 3/4 |
3.50 4.00 |
11 1/2 13 |
14.00 12.00 |
13.00 13.00 |
12.00 10.00 |
12.25 12.25 |
10.50 8.50 |
11.75 11.75 |
MB-1000-16 1/2-12 1/2
MB-1000-22 1/2-16 1/2 MB-1000-26 1/2-20 1/2 |
1 1 |
3.50 3.50 |
16 1/2 20 1/2 |
17.00 12.00 |
17.50 17.50 |
14.50 9.50 |
16.25 16.25 |
12.50 7.50 |
15.50 15.50 |
MB-1250-20-16
MB-1250-30-23 MB-1250-37-29 1/2 |
1 1/4 1 1/4 |
5.00 5.50 |
23 29 1/2 |
19.50 12.00 |
22.00 22.00 |
16.00 8.50 |
20.50 20.50 |
14.00 6.50 |
19.25 19.25 |
*Recommendation based on independent laboratory testing. All other embedment and center to center recommendations based on design by analysis provisions of ACI 349. Appendix B.
NOTES:
1. Maximum attachment thickness is based on torque tensioning of anchor.
Any lesser attachment thickness may be used. Where the anchor is to be
hydraulically tensioned, maximum attachment thicknesses will be reduced
by one stud diameter.
2. Consideration of stress area reduction for limited concrete depth
is not reflected in the above table. Minimum concrete depth = anchor embedment
plus (center-to-center spacing/2).
3. Maxi-Bolt part numbers are specified as follows: MB-Diameter Series
Number --- Overall Length-Sleeve Length (combined expansion sleeve and
distance tube lengths).
4. Minimum edge distances quoted are for shear or combined tension
and shear. For tension loading, edge distance may be reduced to 75 percent
of given value.
5. Allowable values are limited to a maximum of six bolts in a two-row,
three-column, or three-row, two-column arrangement. Allowable values may
also be used for anchors placed in a single line and separated from other
anchor lines by a minimum distance of two times the anchor embedment length.
6. In-place embedment length is determined by subtracting the over-all
length (second number shown in Anchor Part No. column) from the exposed
projection.
NOMINAL
ANCHOR SIZE (Inches) |
DRILL DIAMETER
MAXIMUM (Inches) |
MINIMUM HOLE
DEPTH, ANCHOR EMBEDMENT PLUS |
UNDERCUTTING TOOL | TENSIONING
TORQUE (Ft.-Lbs.) |
SETTING LOAD
50% Fy (Pounds) |
TENSIONING
LOAD 81% FY (Pounds) |
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Diameter A
(Inches) |
Diameter B
(Inches) |
Tolerance
(Inches) |
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1/4 | 0.530 | 1 inch | 0.500 | 0.625 | +.010
-.030 |
9-12 | 1,700 | 2,700 |
3/8 | 0.655 | 1 inch | 0.625 | 0.750 | +.010
-.030 |
40-44 | 4,100 | 6,600 |
1/2 | 0.778 | 1 inch | 0.709 | 0.949 | +.010
-.030 |
80-85 | 7,455 | 12,077 |
5/8 | 0.975 | 1 inch | 0.905 | 1.176 | +.010
-.030 |
185-190 | 11,865 | 19,221 |
3/4 | 1.172 | 1 1/2 inch | 1.102 | 1.550 | +.010
-.040 |
345-350 | 17,535 | 28,406 |
1 | 1.690 | 2 inches | 1.625 | 2.275 | +.010
-.050 |
645-650 | 31,815 | 51,540 |
1 1/4 | 2.065 | 2 inches | 2.000 | 2.770 | +.010
-.060 |
1,470-1,475 | 52,485 | 85,024 |
1/2 Heavy | 0.845 | 1 inch | 0.812 | 1.120 | +.010
-.030 |
80-85 | 7,455 | 12,077 |
NOTES:
1. Undercutting tool diameter A is given for identification purposes
only. No tolerance applies to this dimension.
2. Undercutting tool diameters A and B are noted in Figure No. 3