Product Technical Guides : US-EN Anchor Fastening - August 2021

Table 16 — Hilti HIT-HY 270 allowable adhesive bond loads for threaded rods in multi-wythe hollow brick wall ¹ ^, ³ ^, ⁴ ^, ⁵ ^, ⁷ ^, ⁸

Nominal anchor diameter in .

3 / 8

1 / 2

5 / 8

3 / 4

Effective embedment in . ( mm ) ⁶

Tension lb ( kN )

Shear lb ( kN )

6-1 / 4 ( 160 ) 880 ( 3.9 ) 560 ( 2.5 )

Minimum edge distance

c _min in . ( mm )

Critical

s _cr in . ( mm )

Anchor installed into the face of brick masonry wall ²

Minimum

s _min in . ( mm )

Spacing

Load reduction factor in tension @ s _min

Load reduction factor in shear @ s _min

0.89 1.00 9-3 / 4 ( 248 ) 1,540 ( 6.9 ) 895 ( 4.0 ) 0.96 0.75

6-1 / 4 ( 160 ) 1,430 ( 6.4 ) 655 ( 2.9 ) 0.59 0.75

9-3 / 4 ( 248 ) 2,020 ( 9.0 ) 895 ( 4.0 ) 0.89 0.78

4 ( 102 ) 16 ( 406 ) 8 ( 203 ) 6-1 / 4 ( 160 ) 1,695 ( 7.5 ) 655 ( 2.9 ) 0.50 0.71

9-3 / 4 ( 248 ) 2,165 ( 9.6 ) 895 ( 4.0 ) 0.71 0.58 8 ( 203 ) 1,380 ( 6.1 ) 855 ( 3.8 ) 1.00 0.67 10 ( 250 ) 2,075 ( 9.2 ) 1,070 ( 4.8 ) 0.79 0.54

Anchor installed into the top of brick masonry wall 3 / 8 3-1 / 8 ( 79 ) 315 ( 1.4 ) 220 ( 1.0 ) 2.5 ( 64 ) 8 ( 203 ) 8 ( 203 ) 1 1

Anchor installed into the side of brick masonry wall 3 / 8 3-1 / 8 – ( 79 ) 570 ( 2.5 ) 290 ( 1.3 ) 2.5 ( 64 ) 8 ( 203 ) 8 ( 203 ) 1 1

1 All values are for anchors installed in brick masonry with minimum masonry strength of 3000 psi . Brick units must be in conformance with ASTM C652 . Allowable loads have been calculated using a safety factor of 5 .

2 Anchors must be installed in the face of the multi-wythe URM wall . 2-wythe brick walls must have minimum of 6 inches thickness . Anchors with the effective embedment larger than 6-1 / 4 ” inches must be installed in the wall with minimum thickness of 13 inches made up of 3-wythe brick walls .

3 Edge distance , c _min , and spacing , s _min

, are the minimum distances for which values are available and installation is recommended . Edge distance is measured from the center of the anchor to each edge . Spacing is measured from the center of one anchor to the center of an adjacent anchor .

4 Allowable loads must be the lesser of the adjusted bond tabulated values and the steel values given in table 3 . 5 Allowable loads shall be adjusted for increased base material temperature in accordance with Figure 13 . 6 Tabulated embedment depth is limited by the length of the plastic HIT-SC screens . 7 For combined loading : ( T _applied

/ T _allowable ) + ( V _applied

/ V _allowable

) ≤ 1 8 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 s _cr and c _cr must be multiplied by the appropriate load reduction factor based on actual edge distance ( c ) and spacing ( s ).

Figure 10 — Hilti HIT-HY 270 shear anchor or dowel in configuration A

Figure 11 — Hilti HIT-HY 270 with 22-1 / 2 ° combination anchor in configuration B

Table 17 — Hilti HIT-HY 270 allowable adhesive bond seismic loads for threaded rods and reinforcing bars in unreinforced brick masonry ¹ ^, ² ^, ³

Nominal anchor diameter ( in .) or rebar size

1 / 2 or # 4

Embedment in . ( mm )

Configuration A – Shear anchor or rebar dowel

Minimum wall thickness in . ( mm )

Tension lb ( kN )

Shear lb ( kN ) ⁴

- 500 ( 2.2 )

5 / 8 or # 5 8 ( 203 ) 13 ( 330 )

- 750 ( 3.3 3 / 4 or # 6 - 1,000 ( 4.4 )

Nominal anchor diameter ( in .)

3 / 4

Embedment in . ( mm )

Configuration B – 22-1 / 2 ° combination anchor Minimum wall thickness in . ( mm )

Tension lb ( kN )

Shear lb ( kN ) ⁴

Within 1 inch of
opposite wall surface	13 ( 330 )	1200 ( 5.3 )	1,000 ( 4.4 )

1 Allowable load values are applicable only to anchors where in-place shear tests indicate minimum mortar strength of 50 psi . 2 Allowable loads are computed in accordance with ICC-ES AC60 ( 2010 ) and IBC ( 2009 ). 3 No increase for short-term loading is permitted , such as loading induced by wind or earthquake . 4 Anchors must be tested in accordance with the requirements of IEBC and UCBC

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