Post-installed reinforcing bars
Transverse reinforcement limits width of splitting cracks
A
CIP reinforcing bars
forces transferred directly to CIP reinforcing bars via bond
Section A-A
DEVELOPMENT AND SPLICING USING CSA A23.3 CHAPTER 12 PROVISIONS
CSA A23.3 Chapter 12 contains provisions for reinforcing bar development and splice lengths in non-seismic applications analogous to those of ACI 318 . While not formally recognized in ICC-ES ESRs , Hilti HIT-RE 500 V3 and HIT-HY 200 V3 is commonly used with the provisions of CSA A23.3 based on the testing performed in accordance with ICC-ES AC308 . As with the design for ACI 318 Chapter 25 , design of post-installed reinforcing bars with HIT-RE 500 V3 and HIT-HY 200 V3 may be performed equivalently to cast-in reinforcing bars using the applicable equations in CSA A23.3 . The basic expression for tension development length is provided in the equation as follows :
Splicing of post-installed reinforcing bars
Tension development length : ACI 318 25.4.2.3
Under the conditions given in ESR-3814 and ESR-4868 as revised in July 2015 , design of post-installed reinforcing bars with HIT-RE 500 V3 and HIT-HY 200 V3 , respectively , may be performed using the applicable provisions of ACI 318 Chapters 18 and 25 . The basic expression for tension development length in Chapter 25 is provided in the following equation as :
l d
=
[ ]
3 ƒ y ψ t ψ e ψ s
40λ ƒ ' c c b
+ K tr
d b where the confinement term ( c b
+ K tr )/ d b shall not be taken as greater than 2.5 and the design value of l d shall not be less than 12 inches per 25.4.2.1 . Note : Because the " top bar " factor , ψ t
, accounts for bar position effects in freshly poured concrete , it may be neglected for the drilled-in portion of post-installed bars . ψ t must be applied where applicable for the freshly cast-in portion of new bars and for the spliced portions of existing cast-in-place bars .
d b
Tension lap splices : ACI 318 25.5.2 A Class B splice taken as the greater of 1.3l d and 12 inches is required in all cases unless 1 ) the area of reinforcement provided is at least twice that determined by analysis over the entire length of the splice and 2 ) one-half or less of the total reinforcement is spliced within the lap length . Where 1 ) and 2 ) are satisfied , a Class A splice taken as the greater of 1.0l and 12 inches may be used .
Table 89 in Sec . 3.2.3 , and Table 83 in Sec . 3.2.4 provide a summary of calculated development and splice lengths for a range of concrete strengths for HIT-HY 200 V3 and HIT-RE 500 V3 for the specific case where the confinement term ( c b
+ K tr )/ d b has been taken as the maximum value of 2.5 . Refer to Chapter 6 of the Post-Installed Reinforcing Bar Guide and ESRs for additional design information relating to development length and lap splices .
Post-installed reinforcing bars
Transverse reinforcement limits width of splitting cracks
CIP reinforcing bars
forces transferred directly to CIP reinforcing bars via bond
Splicing of post-installed reinforcing bars
Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.1 ANCHOR PRINCIPLES AND DESIGN 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
A
Section A-A
Tension development length : CSA A23.3 12.2.2 EQ 12-1
k 1 k 2 k 3 k 4 ƒ y l d
= 1.15 ( dcs + k tr
) ƒ ' A b c
where the confinement term ( d cs
+ K tr ) shall not be taken greater than 2.5 and the design value of l d shall not be less than 300 mm per 12.2.1 . Note : Because the " top bar " factor , k 1
, accounts for bar position effects in freshly poured concrete , it may be neglected for the drilled-in portion of post-installed bars . k 1 must be applied where applicable for the freshly cast-in portion of new bars and for the spliced portions of existing cast-in-place reinforcement .
Tension lap splices : CSA A23.3 12.15.1 A Class B splice taken as the greater of 1.3l d and 300 mm is required in all cases unless 1 ) the area of reinforcement provided is at least twice that determined by analysis over the entire length of the splice and 2 ) one-half or less of the total reinforcement is spliced within the lap length . Where 1 ) and 2 ) are satisfied , a Class A splice taken as the greater of 1.0l d and 300 mm may be used .
25