PROFIS Design Guide - AC 318-19 July 2022 | Page 48

1.2 Concrete Breakout Failure Mode

Equations N _cb

Equations ACI 318-19 Chapter 17 Provision Comments for PROFIS Engineering

N _cb

= ^A Nc ψ _{ed , Na} ψ _{c , N} ψ _{cp , N}

N _b

A _Nc0

17.6 . 2.1 Nominal concrete breakout strength in tension , N _cb of a single anchor …….. shall be calculated by ( a )…………… ( a ) For a single anchor

N _cb

= ^A Nc ψ _{ed , N} ψ _{c , N} ψ _{cp , N}

N _b

( 17.6.2.1a )

A _Nc0

Reference the Calculations section of the PROFIS Engineering report for more information on the following parameters :

A _Nc

: area of influence for anchors in tension

A _Nc0

: area of influence for single anchor in tension

ψ _{ed , N}

: tension modification factor for edge distance

ψ _{cp , N}

: modification factor for splitting

N _b

: basic concrete breakout strength in tension

Reference the Variables section of the PROFIS Engineering report for information on : ψ _{c , N}

: modification factor for cracked concrete

Equations ϕN _cb

Equations ACI 318-19 Chapter 17 Provision Comments for PROFIS Engineering

ϕN _cb

≥ N _ua

17.5 . 2 For each applicable factored load combination , design strength of anchors shall satisfy the criteria in Table 17.5.2 .

ACI 318-19 strength design provisions for tension check a calculated design strength ( ϕN _N

) against a factored tension load ( N _ua ).

Table 17.5.2 Failure Mode Concrete Breakout Strength in Tension

Single Anchor

ϕN _cb

≥ N _ua

A summary of calculated tension design strength versus the factored tension load for each tension failure mode relevant to the application is given in Part 3 Tension Load of the PROFIS Engineering report .

48 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-19 Provisions