PROFIS Design Guide: US-EN Summer 2021 | Page 260

PART 4 SHEAR LOAD

Pryout Failure Mode ( Concrete Breakout )

Equation ψ _{ec , N}

( continued )

Equation 318-14 Chapter 17 Provision Comments for PROFIS Engineering

ψ _{ec , Na}

=

1

1 + ^{e ́N} c _Na

If shear eccentricity exists in more than one direction , PROFIS Engineering calculates a ψ-modification factor for each direction using Eq . ( 17.4.2.4 ). PROFIS Engineering designates the ψ-modification factor for eccentricity in the x-direction “ ψ _{ec1 , N}

”, and the ψ-modification factor for eccentricity in the y-direction “ ψ _{ec2 , N}

”. Per Section 17.4.2.4 , PROFIS Engineering uses the product of these modification factors in Eq . ( 17.4.2.1b ) to calculate the pryout parameter ( N _cpg

) per Eq . ( 17.5.3.1b ) when shear eccentricity exists in both the x and y directions .

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

e _{c1 , N}

: Parameter for shear eccentricity with respect to the x direction

e _{c2 , N}

: Parameter for shear eccentricity with respect to the y direction

h _ef

: Parameter for anchor effective embedment depth

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

ψ _{ec1 , N}

: Modification factor for shear eccentricity with respect to the x direction

ψ _{ec2 , N}

: Modification factor for shear eccentricity with respect to the y direction

260 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions