PART 3 TENSION LOAD
Pullout Failure Mode
Variables ψ c , P
Variables ACI 318-14 Chapter 17 Provision Comments for PROFIS Engineering
ψ c , P
17.4.3.1 The nominal pullout strength of a single cast-in , post-installed expansion , and postinstalled undercut anchor in tension , N pn
, shall not exceed where ψ c , P is defined in 17.4.3.6 .
N pn
= ψ c , p
N p
( 17.4.3.1 )
17.4.3.6 For an anchor loaded in a region of a concrete member where analysis indicates no cracking at service load levels , the following modification factor shall be permitted
ψ c , P
= 1.4 Where analysis indicates cracking at service load levels , ψ c , P shall be taken as 1.0 . cast-in anchors PROFIS Engineering parameters for calculating the nominal pullout strength of cast-in anchors :
N pn
= ψ c , p
N p
( 17.4.3.1 ) mechanical anchors PROFIS Engineering parameters for calculating the nominal pullout strength of mechanical anchors :
N pn , f ́c
= N p , 2500 λ a
( f ́c / 2500 ) n
HIT-Z / R threaded rods used with HIT-HY 200 adhesive PROFIS Engineering parameters for calculating the nominal pullout strength of HIT-Z and HIT-Z-R threaded rods used with HIT-HY 200 adhesive :
N pn
= N p λ a
ACI 318 anchoring-to-concrete provisions default to an assumption that concrete will crack under service load conditions . ψ c , P is a modification factor for cracked or uncracked concrete conditions when calculating nominal pullout strength in tension . ψ c , P
= 1.0 for cracked concrete conditions . If analysis indicates that concrete will remain uncracked under service load conditions , ψ c , P can be increased to a value of 1.4 .
When designing cast-in anchors with PROFIS Engineering , and cracked concrete conditions are assumed ; PROFIS Engineering calculates the nominal pullout strength ( N pn
) using ψ c , P
= 1.0 . If uncracked concrete conditions are assumed , PROFIS Engineering calculates the nominal pullout strength ( N pn
) using ψ c , P
= 1.4 .
PROFIS Engineering always calculates pullout strength for the post-installed anchors in its portfolio using ψ c , P
= 1.0 , regardless of whether cracked or uncracked concrete conditions have been assumed . When designing mechanical anchors , the nominal pullout strength ( N pn , f ́c
) accounts for cracked or uncracked concrete conditions via the parameter ( N p , 2500
). When designing HIT-Z or HIT-Z-R threaded rods with HIT-HY 200 adhesive , the nominal pullout strength ( N pn
) accounts for cracked or uncracked concrete conditions via the parameter ( N p
).
Reference the Equations and Results section of the cast-in anchor report for more information on the following parameters :
• N pn
— nominal pullout strength for cast-in or adhesive anchors
Reference the Equations and Results section of the post-installed anchor report for more information on the following parameters :
• N pn
— nominal pullout strength for HIT-Z / R anchors with HIT-HY 200
• N pn , f ́c
— nominal pullout strength for mechanical anchors
Reference the Variables section of the post-installed anchor report for more information on the following parameters :
• N p , 2500 — tested pullout strength for mechanical anchors
• N p
— tested pullout strength for HIT-Z / R anchors with HIT-HY 200
84 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions