PROFIS ENGINEERING REPORT SHEAR LOAD
Concrete Breakout Failure Mode
Variables d a
Variables 318-14 Chapter 17 Provision Comments for PROFIS Engineering
d a
17.5.2.2 The basic concrete breakout strength in shear of a single anchor in cracked concrete , V b , shall be the smaller of ( a ) and ( b ):
( a ) V b = 7 l e
0.2 d a d a λ a f ́c
( c a1 ) 1 . 5 ( 17.5.2.2a )
( b ) V b = 9λ a f ́c ( c a1 ) 1 . 5 ( 17.5.2.2b )
17.5 . 2.3 For cast-in headed studs , headed bolts , or hooked bolts that are continuously welded to steel attachments ……………………………………………..
V b
, shall be the smaller of Eq . ( 17.5.2.2b ) and Eq . ( 17.5.2.3 )
V b
= 8 l e
0.2 d a d a λ a f ́c
( c a1 ) 1 . 5 ( 17.5.2.3a )
PROFIS Engineering AWS D1.1 headed stud portfolio diameter range .
MATERIAL SPECIFICATION
AWD D1.1 Headed Stud
ANCHOR DIAMETER ( d anchor
) ( in ) 0.500 0.625 0.750 0.875
PROFIS Engineering headed bolt portfolio diameter range .
Anchor diameter ( d a
) is a parameter that is used to calculate the basic concrete breakout strength in shear ( V b
) for both cast-in anchors and post-installed anchors . d a is included in ACI 318-14 Eq . ( 17.5.2.2a ) and Eq . ( 17.5.2.3 ). ACI 318-14 Eq . ( 17.5.2.2b ) is used to calculate a limiting value for V b
, which does not include da as parameter . The commentary R17.5.2.2 notes : “ The influence of anchor stiffness and diameter is not apparent in large-diameter anchors , resulting in a limitation on the shear breakout strength provided by Eq . ( 17.5.2.2b )”. Therefore , increasing the anchor “ stiffness ” ( l e
) and diameter ( d a ) does not result in a corresponding increase in V b . This is accounted for in Eq . ( 17.5.2.2 . b ) which does not include either l e or d a in the V b calculation .
The PROFIS Engineering cast-in anchor portfolio includes anchor diameters ranging from 1 / 2 ” to 2 ”, depending on the anchor type . The diameter ranges utilized by PROFIS Engineering for these anchor types are shown to the left .
Post-installed mechanical anchors can be shown compliance under the International Building Code via testing per the ICC-ES acceptance criteria AC193 in conjunction with the ACI standard ACI 355.2 . 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 . The anchor element diameter range that has been utilized to qualify a specific post-installed anchor via this testing will be given in the ICC- ESR for the anchor . PROFIS Engineering uses the diameter range referenced in the ICC-ESR provisions for a particular anchor element . Reference the ICC-ESR to see whether the d a
-value corresponds to the nominal anchor diameter or to the diameter of the anchor element inclusive of an external sleeve .
Reference the Equations and Calculations sections of the PROFIS Engineering report for more information on the parameter V b
.
MATERIAL SPECIFICATION
ASTM F1554 Headed Bolt GR . 36 , 55 , 105
Hex Head Anchor Diameter ( d anchor
) ( in )
Heavy Hex Head Anchor Diameter
( d anchor ) ( in )
Square Head Anchor Diameter
( d anchor ) ( in )
Heavy Square Head Anchor Diameter
( d anchor
) ( in ) 0.500 0.500 0.500 0.500 0.625 0.625 0.625 0.625 0.750 0.750 0.750 0.750 0.875 0.875 0.875 0.875 1.000 1.000 1.000 1.000 1.125 1.125 1.125 1.125 1.250 1.250 1.250 1.250 1.375 1.375 1.375 1.375 1.500 1.500 1.500 1.500 1.750 2.000
184 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions