PART 4 SHEAR LOAD
Steel Failure Mode
Variables ( 0.6 A se , V f uta
)
Variables 318-14 Chapter 17 Provision Comments for PROFIS Engineering ( 0.6 A se , V f uta
) 17.5.1.1 The nominal strength of an anchor in shear as governed by steel , V sa
, shall be evaluated by calculations based on the properties of the anchor material and the physical dimensions of the anchor . Where concrete breakout is a potential failure mode , the required steel shear strength shall be consistent with the assumed breakout surface .
17.5.1.2 The nominal strength of an anchor in shear , V sa , shall not exceed ( a ) through ( c ):
( a ) For cast-in headed stud anchor
V sa
= A se , V f uta
( 17.5.1.2a ) where A se , V is the effective cross-sectional area of an anchor in shear , in . 2 , and f uta shall not be taken greater than the smaller of 1.9fy a and 125,000 psi .
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 A se , V f uta
( 17.5.1.2b ) where A se , V is the effective cross-sectional area of an anchor in shear , in . 2 , and f uta shall not be taken greater than the smaller of 1.9fy a and 125,000 psi . ( c ) For post-installed anchors where sleeves extend through the shear plane , V sa shall be based on the results of tests performed and evaluated according to ACI 355.2 . Alternatively , Eq . ( 17.5.1.2b ) shall be permitted to be used .
Excerpts from ICC-ESR-3187 referencing the parameter V sa for HIT-Z carbon steel threaded rods ( Table 7 ) and ASTM F1554 Gr . 36 threaded rods ( Table 11 ). The parameter “ V sa
” is designated
“ 0.6 A se , V f uta
” in the Variables section of the PROFIS Engineering report when the HIT-HY 200 adhesive anchor system has been selected .
Post-installed adhesive anchor systems can be qualified for recognition under the 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 an ICC-ES evaluation report ICC-ESR . Pre-calculated values for nominal steel strength in shear are given in the ICC-ESR steel design tables . PROFIS Engineering uses these values to define the nominal steel strength in shear .
When modeling the HIT-HY 200 adhesive anchor system for static load conditions in PROFIS Engineering , the V sa
-value given in the ICC-ESR is shown in the Variables section of the report as “ 0.6 A se , V f uta
”. However , this parameter is still shown as “ V sa
” in the Calculations and Results section of the report . When modeling HIT-HY 200 for seismic load conditions , the α V , seis
-value is also shown in the Variables section of the report , and PROFIS Engineering shows the product “( α V , seis
)( 0.6 A se , V f uta
)” as “ V sa , eq
” in the Calculations and Results section of the report .
Reference the Calculations and Results section of the PROFIS Engineering report for more information on :
V sa
: Nominal ( static ) steel strength in shear
V sa , eq
: Nominal ( seismic ) steel strength in shear
Reference the Variables section of the PROFIS Engineering report for more information on :
A se , V
: Tensile stress area of an anchor element
0.6 A se , V f uta
: Pre-calculated V sa -value from ICC-ESR α V , seis
: Reduction for seismic shear ( steel strength )
ICC-ESR-3187 Table 7
DESIGN INFORMATION Symbol Units
Nominal rod diameter ( in ).
3 / 8 1 / 2 5 / 8 3 / 4
CARBON
STEEL
Nominal strength as governed by steel strength
Reduction factor , seismic shear
V sa lb 3215 5886 9375 13,848 α V , seis
- 0.65
ICC-ESR-3187 Table 11
DESIGN INFORMATION Symbol Units
Nominal rod diameter ( in ). 3 / 8 1 / 2 5 / 8 3 / 4 7 / 8 1 1-1 / 4
ASTM F1554
Gr . 36
Nominal strength as governed by steel strength
Reduction factor , seismic shear
V sa lb - 4940 7865 11,640 16,070 21,080 33,725 α V , seis
- 0.60
303 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions