Anchor Fastening Technical Guide , Edition 22
Table 95 — Suggested embedment , edge distance , and spacing ( see figure below ) to develop 125 % of f y in Canadian
400 MPa bars based on CSA A23.3 Annex D — non-seismic design only 1 , 2 , 3 , 4 , 5 , 6 , 7
Rebar size
Effective embed .
h ef mm ƒ ' c = 20 MPa ƒ ' c
= 25 MPa ƒ ' c = 30 MPa ƒ ' c
= 40 MPa
Minimum edge dist
c a , min mm Min .
Cond . I
Cond . II spacing
s min mm
Effective embed .
h ef mm
Minimum edge dist
c a , min mm Min .
Cond . I
Cond . II spacing
s min mm
Effective embed .
h ef mm
Minimum edge dist
c a , min mm Min . spacing
s min mm
Effective embed .
h ef mm
Minimum edge dist
c a , min mm Min .
10M 200 520 220 440 200 510 200 400 200 510 190 380 190 500 180 350 15M 280 740 350 690 280 730 320 640 270 720 300 600 270 710 280 550 20M 350 910 450 900 340 890 420 840 330 880 400 790 320 870 360 720 25M 450 1,170 630 1,260 440 1,150 590 1,170 430 1,140 560 1,110 420 1,120 500 1,000 30M 530 1,390 790 1,580 520 1,360 740 1,470 510 1,350 690 1,380 490 1,320 630 1,260
1 For additional information see May-June 2013 issue of the ACI Structural Journal , “ Recommended Procedures for Development and Splicing of Post-Installed Bonded Reinforcing Bars in Concrete Structures ” by Charney , Pal and Silva .
2 h ef is the calculated bar embedment uncracked based on bond and concrete breakout strengths using equations in section 3.1.14 to develop 125 % of nominal bar yield . Additional reductions per ACI 318 17.3.1.2 for sustained loading conditions are not included and as such these suggested embedments are not intended for sustained tension load applications . The particular assumptions used for the application of anchor theory to bar development ( e . g ., bar yield and bond strength values ) are a matter of engineering judgment and will in part depend on the specific circumstances of the design . For embedments corresponding to nominal yield ( i . e ., no overstrength ) multiply the unbolded and bolded tabulated h ef values by 0.80 and 0.86 , respectively . 3 c a and s are the minimum edge distance and bar spacing ( from bar centerline ) associated with the tabulated embedments . Refer to sec . 3.1.14 for applicability of edge distance “ Condition I ” and “ Condition II .” 4 Applicable for hammer-drilled holes . For rock-drilled and core-drilled holes , contact Hilti . 5 Values determined with bond stresses , k-factors and strength reduction factors taken from ESR-4868 Tables 20 and 21 assuming dry , uncracked concrete conditions where concrete temperatures will not exceed a maximum short-term temperature of 130 ° F ( 55 ° C ) and long-term temperature of 110 ° F ( 43 ° C ). Bond stresses are for static ( non-seismic ) loading conditions . 6 Values are for normal weight concrete . For lightweight concrete contact Hilti . 7 Refer to the Hilti North America Post-Installed Reinforcing Bar Guide for further explanation , background information , and design examples . See Hilti Instructions for Use ( IFU ) for specific installation requirements .
Cond . I
Cond . II
Cond . I
Cond . II spacing
s min mm
3.2.2
≥ c a , min ≥ s min
≥ c a , min
≥ c a , min ≥ s min
( N )
≥ s min h ef
SECTION ( E )
SECTION Illustration of Table 95 dimensions
PLAN
Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.2.2 HILTI HIT-HY 200 A / R V3 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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