PROFIS ENGINEERING REPORT SHEAR LOAD
Concrete Breakout Failure Mode
Variables f ́c
Variables 318-14 Chapter 17 Provision Comments for PROFIS Engineering
f ́c
17.2.7 The values of f ́c used for calculation purposes in this chapter shall not exceed 10,000 psi for cast-in anchors , and 8000 psi for post-installed anchors . Testing is required for post-installed anchors when used in concrete with f ́c greater than 8000 psi .
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 )
Excerpt from ICC-ESR-3187 ( HIT-HY 200 adhesive anchor system ) showing provisions for f ́c .
5.2 The anchors and post-installed reinforcing bars must be installed in cracked and uncracked normal-weight concrete having a specified compressive strength f ́c = 2500 psi to 8500 psl .
5.3 The values of f ́c used for calculation purposes must not exceed 8000 psi except as noted in Sections 4.2.2 and 4.2.5 of this report . f ́c is a parameter used to define concrete compressive strength . This parameter is used to calculate the “ basic concrete breakout strength in shear ” ( V b
) when calculating the nominal concrete breakout strength in shear ( V cb or V cbg
).
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 . f ́c provisions for a specific post-installed anchor are derived from this testing and will be given in the ICC-ESR for the anchor . PROFIS Engineering uses these f ́c provisions for post-installed anchor design . The post-installed anchor portfolio in PROFIS Engineering is limited to installation in concrete having a specified compressive strength between 2500 psi and 8500 psi , and design using an f ́c-value less than or equal to 8000 psi . Reference the ICC-ESR for f ́c information specific to a post-installed anchor .
PROFIS Engineering users can input an f ́c-value within the range 2500 psi < f ́c < 8500 psi for post-installed anchor design . The maximum f ́c-value for calculations will be limited to 8000 psi .
PROFIS Engineering users can input an f ́c-value within the range 2500 psi < f ́c < 10,000 psi for cast-in-place anchor design . The maximum f ́c-value for calculations will be limited to 10,000 psi .
Reference the Equations and Calculations sections of the PROFIS Engineering report for more information on the parameter V b
.
Excerpt from ICC-ESR-1917 ( Kwik Bolt-TZ expansion anchor ) showing provisions for f ́c .
5.2 The anchors must be limited to use in cracked and uncracked normal-weight concrete having a specified compressive strength f ́c = 2500 psi to 8500 psl , and cracked and uncracked normalweight or sand-lightweight concrete over metal deck having a minimum specified compressive strength , f ́c of 3000 psi .
5.3 The values of f ́c used for calculation purposes must not exceed 8000 psi .
186 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions