POST-INSTALLED REBAR DESIGN IN CONCRETE PER ACI 318
Anchor Fastening Technical Guide , Edition 22
3.2.2
Development and splicing of post-installed reinforcement
Calculations for post-installed rebar for typical development lengths may be done according to ACI 318 Chapter 25 ( formerly ACI 318-11 Chapter 12 ) and CSA A23.3 Chapter 12 for adhesive anchors tested and approved in accordance with AC 308 . This section contains tables for the data provided in ICC Evaluation Services ESR-4868 . Refer to section 3.1.14 and the Hilti North America Post-Installed Reinforcing Bar Guide for the design method .
Table 89 — Calculated tension development and Class B splice lengths for Grade 60 bars in walls , slabs , columns , and footings per ACI 318 Chapter 25 for Hilti HIT-HY 200 A / R V3 — SDC A and B only 3 , 4 , 5 , 6 , 7 , 8
System ƒ ' c
= 2,500 psi ƒ ' c = 3,000 psi ƒ ' c
= 4,000 psi ƒ ' c = 6,000 psi
Rebar size
HIT-HY 200-A V3
HIT-HY 200-R V3
# 3 ◐ ◐ c b
+ K tr
d b
Minimum edge dist . in . 1
Minimum spacing in . 2 l d in .
# 6 ■ ◐ 3-3 / 4 3-3 / 4 22 28 20 26 17 22 14 18 2.5
# 7 ■ ◐ 4-1 / 2 4-1 / 2 32 41 29 37 25 32 20 26
Class B splice in . l d in .
Class B splice in . l d in .
Class B splice in .
2-1 / 4 2 12 14 12 13 12 12 12 12 # 4 ◐ ◐ 2-3 / 4 2-1 / 2 14 19 13 17 12 15 12 12 # 5 ◐ ◐ 3 3-1 / 4 18 23 16 21 14 18 12 15
# 8 ■ ◐ 5 5 36 47 33 43 28 37 23 30 # 9 ■ ◐ 5-1 / 4 5-3 / 4 41 53 37 48 32 42 26 34 # 10 ■ ◐ 5-3 / 4 6-1 / 2 46 59 42 54 36 47 30 38
◐ Applicable for use with special installation provisions and installation temperature restrictions to account for short gel time with deep embedment depth . See the Instruction For Use ( IFU ), packaged with the product for special installation parameters .
■ Not recommended due to limited gel time of adhesive . 1 Edge distances are determined using the minimum cover specified by ESR-4868 with an additional 6 % of the development length per suggestions for drilling without an aid per Hilti Post- Installed Reinforcing Bar Guide Section 3.3 . Smaller edge distances may be possible , for which development and splice lengths may need to be recalculated . For further information on required cover see ACI 318 , Sec . 20.6.1.3 ; see Sec . 2.2 for determination of c b
.
2 Spacing values represent those producing c b = 5 d b rounded up to the nearest 1 / 4 in . Smaller spacing values may be possible , for which development and splice lengths may need to be recalculated . For further information on required spacing see ACI 318 Sec . 25.2 ; see Sec . 2.2 for determination of c b
.
3 ψ t = 1.0 See ACI 318 , Sec . 25.4.2.4 .
4 ψ e = 1.0 for non-epoxy coated bars . See ACI 318 , Sec . 25.4.2.4 .
5 ψ s
= 0.8 for # 6 bars and smaller bars , 1.0 for # 7 and larger bars . See ACI 318 , Sec . 25.4.2.4 . 6 Values are for normal weight concrete . For sand-lightweight concrete , multiply development and splice lengths by 1.18 , for all-lightweight concrete multiply development and splice lengths by 1.33 . See ACI 318 Sec . 19.2.4 . 7 Development and splice length values are for static design . Seismic design development and splice lengths can be found in ACI 318 18.8.5 for special moment frames and ACI 318
18.10.2.3 for special structural walls . For further information about reinforcement in seismic design , see ACI 318 Ch . 18 . 8 Refer to the Hilti North America Post-Installed Reinforcing Bar Guide for further explanation , background information , and design examples . l d in .
Class B splice in .
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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