Anchor Fastening Technical Guide , Edition 22
Table 12 — Hilti HDA carbon and stainless steel design information in accordance with CSA A23.3 1
Design parameter Symbol Units
Nominal anchor diameter M10 M12 M16 M20
HDA HDA-R HDA HDA-R HDA HDA-R HDA
Anchor O . D . d a mm 19 21 29 35 ( in ) ( 0.75 ) ( 0.83 ) ( 1.14 ) ( 1.38 )
Effective minimum embedment 2 h ef mm 100 125 190 250 ( in ) ( 3.94 ) ( 4.92 ) ( 7.48 ) ( 9.84 )
Min . concrete thickness h min - See tables 1 of this section , or 3A and 3B of ESR-1546
Critical edge distance c ac - 1.5 x hef : See section 4.1.11 of ESR-1546
Min . edge distance c min mm 80 100 150 200 ( in ) ( 3.15 ) ( 3.94 ) ( 5.91 ) ( 7.87 )
Min . anchor spacing s min mm 100 125 190 250 ( in ) ( 3.94 ) ( 4.92 ) ( 7.48 ) ( 9.84 )
Min . specified yield strength f ya psi 92,800 ( N / mm 2 ) ( 640 )
Min . specified ult . strength f uta psi 116,000 ( N / mm 2 ) ( 800 )
Effective tensile stress area A se , N in 2 0.090 0.131 0.243 0.380 ( mm 2 ) ( 58.1 ) ( 84.5 ) ( 156.8 ) ( 245.2 )
Steel embed . material resistance factor for reinforcement
Ref A23.3 ф s
- 0.85 8.4.3
Resistance modification factor for tension , steel failure modes 3 R - 0.80 D . 5.3
Resistance modification factor for shear , steel failure modes 3 R - 0.75 D . 5.3
Factored steel resistance in tension N sar - See tables 10 and 11 of this section D . 6.1.2
Factored steel resistance in shear V sar - See tables 10 and 11 of this section D . 7.1.2
Factored steel resistance in shear , seismic V sar , eq - See tables 10 and 11 of this section
Coeff . for factored concrete breakout resistance , uncracked concrete
Coeff . for factored concrete breakout resistance , cracked concrete k c , uncr
- 12.5 D . 6.2.2 k c , cr
- 10 D . 6.2.2
Modification factor for anchor resistance , tension , uncracked concrete 4 ψ c , N
- 1.0 D . 6.2.6
Anchor category - - 1 D . 5.3 ( c ) Concrete material resistance factor ф c
- 0.65 8.4.2
Resistance modification factor for tension and shear , concrete failure modes , Condition B 5 R - 1.00 D . 5.3 ( c )
Factored pullout resistance lb
N in 20 MPa uncracked concrete 6 pr , uncr
( kN )
N / A D . 6.3.2
Factored pullout resistance in 20 MPa lb 6,295 7,870 15,745 23,615
N cracked concrete 6 pr , cr
( kN ) ( 28.0 ) ( 35.0 ) ( 70.0 ) ( 105.0 )
D . 6.3.2
3.3.1
1 Design information in this table is taken from ICC-ES ESR-1546 , dated March 2020 and converted for use with CSA A23.3 Annex D . 2 See figure 1 of this section . 3 The HDA is considered a ductile steel element as defined by CSA A23.3 Annex D section D . 2 . 4 For all design cases , ψ c , N
= 1.0 . The appropriate coefficient for breakout resistance for cracked concrete ( k c , cr ) or uncracked concrete ( k c , uncr
) must be used .
5 For use with the load combinations of CSA A23.3 Chapter 8 . Condition B applies where supplementary reinforcement in conformance with CSA A23.3 section D . 5.3 is not provided , or where pullout or pryout strength governs . For cases where the presence of supplementary reinforcement can be verified , the resistance modification factors associated with Condition A may be used .
6 For all design cases , ψ c , P
= 1.0 . NA ( not applicable ) denotes that this value does not control for design . See section 4.1.4 of ESR-1546 for additional information .
Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.3.1 HDA UNDERCUT ANCHORS 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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