Table 87 — Suggested embedment , edge distance , and spacing ( see figure below ) to develop 125 % of f y in Grade 60 bars based on ACI 318 Chapter 17 - SDC A and B only 1 , 2 , 3 , 4 , 5 , 6 , 7
Rebar size
Effective embed .
h ef in . ƒ ' c = 2,500 psi ƒ ' c
= 3,000 psi ƒ ' c = 4,000 psi ƒ ' c
= 6,000 psi
Minimum edge dist
c a , min in .
Cond . I
Cond . II
Min . spacing
s min in .
Effective embed .
h ef in .
Minimum edge dist
c a , min in .
Cond . I
Cond . II
Min . spacing
s min in .
Effective embed .
h ef in .
Minimum edge dist
c a , min in .
Min . spacing
s min in .
Effective embed .
h ef in .
Minimum edge dist
c a , min in .
# 3 7 17 8 15 6 16 7 14 6 16 7 13 5 15 6 11 # 4 9 23 11 22 9 23 11 21 8 22 10 19 7 20 9 17 # 5 11 29 15 29 11 28 14 28 10 27 13 25 9 25 11 22 # 6 13 35 19 37 13 34 18 35 12 32 16 32 11 30 14 28 # 7 16 41 23 45 15 40 22 43 14 38 20 39 13 36 17 34 # 8 18 48 27 54 17 46 26 51 16 44 24 47 15 42 21 41 # 9 21 56 32 63 20 54 30 60 18 50 27 54 17 47 24 48 # 10 25 65 37 74 24 63 35 70 22 58 32 64 19 54 28 56
Cond . I
Cond . II
Cond . I
Cond . II
Min . spacing
s min in .
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 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 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 .
≥ c a , min ≥ s min
≥ c a , min
≥ c a , min ≥ s min
( N )
≥ s min h ef
SECTION ( E )
SECTION PLAN
Illustration of Table 87 dimensions
164
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