Anchor Fastening Technical Guide , Edition 22
Table 2 — Hilti HIT-HY 270 allowable adhesive bond tension loads for threaded rods and reinforcing bars in the face of grout-filled concrete masonry walls 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8
Spacing 9 Edge distance 10
|
Nominal anchor diameter
Rebar size
3 / 8 # 3
|
Effective embedment in . ( mm ) 11
3-3 / 8 ( 86 )
|
Tension lb ( kN )
1,240 ( 5.5 )
|
Critical
s cr in . ( mm )
13.5 ( 343 )
|
Minimum
s min in . ( mm )
|
Load reduction factor @ s min
12
0.70
|
Critical
c cr in . ( mm )
12 ( 305 )
|
Minimum
c min in . ( mm )
|
Load reduction factor @
c min
12
0.80
|
3.2.4 |
|
1 / 2 # 4
5 / 8 # 5
|
4-1 / 2 ( 114 )
5-5 / 8 ( 143 )
|
2,035 ( 9.1 )
2,840 ( 12.6 )
|
18 ( 457 )
22.5 ( 572 )
|
4 ( 102 ) |
0.70
0.50
|
20 ( 508 )
20 ( 508 )
|
4 ( 102 ) |
0.76
0.71
|
|
3 / 4 # 6 |
6-3 / 4 ( 171 ) |
3,810 ( 16.9 ) |
27 ( 686 ) |
|
0.50 |
20 ( 508 ) |
|
0.66 |
|
Table 3 — Hilti HIT-HY 270 allowable adhesive bond shear loads for threaded rods and reinforcing bars in the face of grout-filled concrete masonry walls 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8
Nominal anchor diameter
Rebar size
3 / 8 # 3
1 / 2 # 4
5 / 8 # 5
3 / 4 # 6
Effective embedment in . ( mm ) 11
3-3 / 8 ( 86 )
4-1 / 2 ( 114 )
5-5 / 8 ( 143 )
6-3 / 4 ( 171 )
Shear lb ( kN )
850 ( 3.8 )
1,495 ( 6.7 )
2,615 ( 11.6 )
4,090 ( 18.2 )
Critical
s cr in . ( mm )
13.5 ( 343 )
18 ( 457 )
22.5 ( 572 )
27 ( 686 )
Spacing 9 Edge distance 10
Minimum
s min in . ( mm )
4 ( 102 )
Load reduction factor @
s min
12
Critical
c cr in . ( mm )
1.00 12 ( 305 )
1.00 12 ( 305 )
0.50 20 ( 508 )
0.50 20 ( 508 )
Minimum
c min in . ( mm )
4 ( 102 )
Load perpendicular to edge
Load reduction factor @ c min
12
Load parallel to edge
0.88 1.00
0.49 1.00
0.40 0.78
0.26 0.60
The following footnotes apply to both Tables 1 and 2 :
1 All values are for anchors installed in fully grouted concrete masonry with minimum masonry prism strength of 1,500 psi . Concrete masonry units shall be lightweight , medium-weight or heavy-weight conforming to ASTM C90 . Allowable loads are calculated using a safety factor of 5 .
2 Anchors may be installed in any location in the face of the masonry wall including cell , web , and mortar joints . Anchors are limited to one per masonry cell . See Figure 2
3 Linear interpolation of load values between minimum spacing ( s min ) and critical spacing ( s cr
) and between minimum edge distance ( c min ) and critical edge distance ( c cr
) is permitted .
4 Concrete masonry thickness must be equal to or greater than 1.5 times the anchor embedment depth . EXCEPTION : the 5 / 8-inch- and the 3 / 4-inch diameter anchors ( No . 5 and No . 6 bars ) may be installed in minimum nominally 8-inch thick concrete masonry .
5 When using the basic load combinations in accordance with IBC Section 1605.3.1 , tabulated allowable loads must not be increased for seismic or wind loading . When using the alternative basic load combinations in IBC Section 1605.3.2 that include seismic or wind loads , tabulated allowable loads may be increased by 33-1 / 3 percent , or the alternative basic load combinations may be reduced by a factor of 0.75 .
6 Allowable loads must be the lesser of the adjusted masonry or bond tabulated values and the steel values given in tables 3 and 4 . 7 Tabulated allowable loads shall be adjusted for increased base material temperatures in accordance with figure 13 . 8 For combined loading : ( T applied
/ T allowable ) n + ( V applied
/ V allowable ) n ≤ 1 where n = 5 / 3 for 3 / 8- and 1 / 2-inch diameters (# 3 and # 4 rebar ) and n = 1 for 5 / 8- and 3 / 4-inch diameters (# 5 and # 6 rebar ).
9 The critical spacing , s cr , is the anchor spacing where full load values may be used . The minimum spacing , s min
, is the minimum anchor spacing for which values are available and installation is recommended . Spacing is measured from the center of one anchor to the center of an adjacent anchor . 10 The critical edge distance , c cr
, is the edge distance where full load values may be used . The minimum edge distance , c min , is the minimum edge distance for which values are available and installation is recommended . Edge distance is measured from the center of the anchor to the closest edge . 11 Embedment depth is measured from the outside face of the concrete masonry unit . 12 Load reduction factors are multiplicative : both spacing and edge distance load reduction factors , and spacing and edge distances for all adjacent anchors / edges less than s cr
/ c cr , must be considered . Load values for anchors installed at less than scr and c cr must be multiplied by the appropriate load reduction factor based on actual edge distance ( c ) and spacing ( s ).
Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.2.4 HIT-HY 270 HYBRID FOR MASONRY CONSTRUCTION Hilti , Inc . 1-800-879-8000 | en español 1-800-879-5000 | www . hilti . com | Hilti ( Canada ) Corporation | www . hilti . ca | 1-800-363-4458
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