2.0 SHEAR
2.4 Stand-off Failure Mode
Equations HIT-HY 200 adhesive V sa = ( 0.6A se , V ƒ uta
)
Equations ACI 318-19 Chapter 17 Provision Comments for PROFIS Engineering HIT-HY 200 adhesive
V sa
= ( 0.6A se , V ƒ uta
)
17.7.1.1 Nominal steel strength of anchors in shear as governed by the steel , V sa
, shall be evaluated based on the properties of the anchor material and the physical dimensions of the anchors . If concrete breakout is a potential failure mode , the required steel shear strength shall be consistent with the assumed breakout surface .
17.7.1.2 Nominal strength of an anchor in shear , V sa
, shall not exceed ( a ) through ( c ): …………………………………………………..
( b ) For cast-in headed bolt and hooked bolt anchors and for post-installed anchors where sleeves do not extend through the shear plane
V sa
= 0.6 Ase , V ƒ uta
( 17.7.1.2b ) where A se , V is the effective cross-sectional area of an anchor in shear , in . 2 , and the value of ƒ uta shall not exceed either 1.9ƒ ya or 125,000 psi . ( c ) For post-installed anchors where sleeves extend through the shear plane , V sa shall be based on the 5 percent fractile of results of tests performed and evaluated in accordance with ACI 355.2 . Alternatively , Eq . ( 17.7.1.2b ) shall be permitted to be used .
Excerpt from ESR-3187 Table 7 showing V sa and α V , seis values for HIT-Z threaded rods .
ICC-ES ESR 3187 Table 7
DESIGN INFORMATION Symbol Units
CARBON
STEEL
Nominal strength as governed by steel strength
Reduction factor , seismic shear
Nominal rod diameter ( in ). 3 / 8 1 / 2 5 / 8 3 / 4
V sa lb 3215 5886 9375 13,848 α V , seis
- 1.0 0.65
ACI 318-19 Chapter 2 defines the parameter V sa as : “ nominal shear strength of a single anchor or individual anchor in a group of anchors as governed by the steel strength ”.
V sa is always calculated for a single anchor when designing with ACI 318-19 provisions .
The Hilti HIT-HY 200 adhesive system has been qualified for recognition under the International Building Code ( IBC ) via testing per the ICC-ES acceptance criteria AC308 and the ACI test standard ACI 355.4 . Data derived from this testing is given in the ICC-ES evaluation report ESR-3187 . HY 200 can be used with the following anchor elements :
• threaded rods .
• reinforcing bars .
• internally threaded inserts .
• HIT-Z and HIT-Z-R threaded rods
Pre-calculated values for V sa are given in the ESR steel design tables . Although parameters such as A se , V and ƒ uta may be given in the ESR , PROFIS Engineering uses the pre-calculated V sa -values to define the nominal steel strength in shear .
Adhesive anchor ESR V sa
-values are specific to static load conditions . An additional reduction factor designated “ α V , seis
” is applied to the V sa
-value when calculating nominal steel strength in shear for seismic load conditions .
α V , seis
-values are derived from AC308 / ACI 355.4 testing , and will be given in the ESR steel design tables .
The Equations section of the PROFIS Engineering report for HIT-HY 200 steel strength parameters references “ V sa
= ( 0.6 A se , V ƒ uta
)” when modeling static load conditions and “ V sa = α V , seis
( 0.6 A se , V ƒ uta
)” when modeling seismic load conditions , where ( 0.6 A se , V ƒ uta
) corresponds to the V sa
-value given in ESR-3187 steel design tables .
Reference the Calculations and Results section of the report for more information on V sa and Vs a , eq
.
Reference the Variables section of the report for more information on the parameters A se , V and ƒ uta
.
287 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-19 Provisions