PART 4 SHEAR LOAD
Pryout Failure Mode ( Pryout Bond )
Results ϕ concrete
Results 318-14 Chapter 17 Provision Comments for PROFIS Engineering
ϕ concrete
17.3.3 Strength reduction factor ϕ for anchors in concrete shall be as follows when the load combinations of 5.3 are used :
……………………………………………………………………………………………………
( c ) ( c ) Anchor governed by concrete breakout , side-face blowout , pullout , or pryout strength Condition A
Condition B
( i ) Shear loads 0.75 0.70 ……………………………………………………………………………………
Condition A applies where supplementary reinforcement is present except for pullout and pryout strengths .
Condition B applies where supplementary reinforcement is not present and for pullout and pryout strengths .
Example :
Example of a post-installed adhesive anchor system strength reduction factor ( ϕ-factor ) corresponding to concrete breakout failure in shear .
ICC-ESR-3187 Table 12
ACI 318-14 strength design provisions for concrete pryout failure in tension require calculation of a nominal concrete pryout strength ( V cp or V cpg
). The nominal strength is multiplied by a strength reduction factor ( ϕ-factor ) to obtain a design strength ( ϕV cp or ϕV cpg
).
PROFIS Engineering designates the ϕ-factor corresponding to concrete breakout failure “ ϕ concrete
”. Post-installed adhesive anchor systems can be shown compliance under the International Building Code via testing per the ICC-ES acceptance criteria AC308 in conjunction with the ACI standard ACI 355.4 . ϕ-factors derived from AC308 / ACI 355.4 testing , as given in the ICC-ESR for the anchor correspond to “ Condition B ” as defined in ACI 318-14 Section 17.3.3 . “ Condition A ” is not considered for pryout calculations . If Condition A is selected as a design parameter , PROFIS Engineering uses the Condition B ϕ-factor to calculate the design concrete pryout strength .
Reference the Results section of the PROFIS Engineering report for more information on the following parameters :
V cp or V cpg : Nominal concrete pryout strength ϕV cp or ϕV cpg : Design concrete pryout strength
DESIGN INFORMATION |
Symbol |
Units |
3 / 8 or # 3 |
1 / 2 or # 4 |
5 / 8 or # 5
Nominal Rod Diameter ( in ).
3 / 4 or # 6
7 / 8or # 7
1 or # 8
|
# 9 |
1 / 4 or # 10 |
Strength reduction factor for shear , concrete failure modes , Condition B |
ϕ - 0.70 |
247 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions