Anchor Fastening Technical Guide , Edition 22
Table 92 — Suggested embedment , edge distance , and spacing ( see figure below ) to develop 125 % of f y in Canadian
400 MPa bars based on CSA 23.3-14 Annex D - non-seismic design only 1 , 2 , 3 , 4 , 5 , 6 , 7 ƒ ́c = 20 MPa ƒ ́c = 25 MPa ƒ ́c = 30 MPa ƒ ́c = 40 MPa
Rebar size
Effective embed .
h ef mm
Minimum edge dist
c a , min in .
Cond . I
Cond . II
Min . spacing
s min mm
Effective embed .
h ef mm
Minimum edge dist
c a , min in .
Cond . I
Cond . II
Min . spacing
s min mm
Effective embed .
h ef mm
Minimum edge dist
c a , min in .
Min . spacing
s min mm
Effective embed .
h ef mm
Minimum edge dist
c a , min in .
10M 180 480 220 440 170 470 200 400 160 450 190 380 150 430 180 350 15M 260 690 350 690 240 670 320 640 230 650 300 600 220 620 280 550 20M 310 850 450 900 300 820 420 840 280 800 400 790 270 760 360 720 25M 420 1,140 630 1,260 400 1,080 590 1,170 380 1,050 560 1,110 350 1,000 500 1,000 30M 530 1,420 790 1,580 490 1,340 740 1,470 460 1,280 690 1,380 420 1,200 630 1,260
Cond . I
Cond . II
Cond . I
Cond . II
Min . spacing
s min mm
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 based on uncracked bond and concrete breakout strengths using equations in section 3.1.14.3 to develop 125 % of nominal bar yield . Bond stresses apply for sustained and non-sustained load conditions . Additional reductions per ACI 318 , 17.3.1.2 are not included , however , and as such these 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 hef values by 0.80 and 0.86 , respectively . Reduction factors for non-sustained loading and no bar overstrength may be combined .
3 c a and s are the minimum edge distance and bar spacing ( from bar centerline ) associated with the tabulated embedments . Refer to sec . 3.1.14.3 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-3814 Tables 12 and 13 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 .
3.2.3
≥ c a , min ≥ s min
≥ c a , min
≥ c a , min ≥ s min
( N )
≥ s min h ef
SECTION ( E )
SECTION Illustration of Table 91 dimensions
PLAN
Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.2.3 HIT-RE 500 V3 EPOXY ADHESIVE ANCHORING SYSTEM 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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