PART 3 TENSION LOAD
Concrete Breakout Failure Mode
Equation A Nc0
Equation ACI 318-14 Chapter 17 Provision Comments for PROFIS Engineering
A Nc0
= 9h ef
2
17.4 . 2.1 …….. A Nc0 is the projected concrete failure area of a single anchor with an edge distance equal to or greater than 1.5h ef
.
A Nc0
= 9h ef
2
( 17.4.2.1c )
A Nc0 is a modification factor that accounts for the area of influence assumed to develop in concrete when a tension load is applied to a single anchor without the influence of any fixed edges . A Nc0 is calculated with the effective embedment depth of the anchor ( h ef ) input into the PROFIS Engineering model . The geometry for A Nc0 is defined by a projected distance of 1.5h ef from the anchor in the x and y directions . The figure below illustrates how A Nc0 is calculated .
A Nc0
= ( 1.5h ef + 1.5h ef
) ( 1.5h ef + 1.5h ef
)
= ( 9.0h ef
) 2
Reference the Variables section of the PROFIS Engineering report for more information on h ef
.
Reference the Calculations section of the PROFIS Engineering report for more information on A Nc
.
51 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions