PART 3 TENSION LOAD
Pullout Failure Mode
Results ϕ pn
Results ACI 318-14 Chapter 17 Provision Comments for PROFIS Engineering
HIT-Z anchor with HIT-HY 200
ϕN pn
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
N pn
= ψ c , p
N p
( 17.4.3.1 ) 17.4.3 . 2 For post-installed expansion and undercut anchors , the values of N p shall be based on the 5 percent fractile of results of tests performed and evaluated according to ACI 355.2 . It is not permissible to calculate the pullout strength in tension for such anchors .
Excerpt from ICC-ESR-3187 for Hilti HIT-HY 200 adhesive , referencing provisions for calculating nominal pullout strength in tension ( N pn
) per ACI 318-14 Eq . ( 17.4.3.1 ) with HIT-Z ( carbon steel ) or
HIT-Z-R ( stainless steel ) threaded rods .
4.1.4.1 Static Pullout Strength in Tension : Hilti HIT-Z and HIT-Z-R Anchor Rods : The nominal static pullout strength of a single anchor in accordance with ACI 318-14 17.4.3.1 and 17.4.3.2 or ACI 318-11 D . 5.3.1 and D . 5.3.2 , as applicable , in cracked and uncracked concrete , N p , cr and N p , uncr , respectively , is given in Table 10 . For all design cases , ψ c , p
= 1.0 . Excerpt from ICC-ESR-3187 Table 10 showing values for N p , cr
, N p , uncr and ϕ-factors derived from testing per AC308 / ACI 355.4 .
ICC-ESR-3187 Table 10
DESIGN INFORMATION Symbol Units
Temperature Range A
Permissible Installation Conditions
Nominal rod diameter ( in .) 3 / 8 1 / 2 5 / 8 3 / 4
Pullout strength in cracked concrete N p , cr lb 7,952 10,936 21,931 27,930
Pullout strength in uncracked concrete N p , uncr lb 7,952 11,719 21,931 28,460
Dry concrete , water saturated concrete
Anchor Category - 1 ϕ d
, ϕ ws
- 0.65
17.3.3 Strength reduction factor ϕ for anchors in concrete shall be as follows when the load combinations of 5.3 are used :
Condition A applies where supplementary reinforcement is present except for pullout and pryout strengths .
Condition B applies where supplementary reinforcement is not present and for pullout and pryout strengths .
17.2.3.4.4 The anchor design tensile strength for resisting earthquake forces shall be determined from consideration of ( a ) through ( e ) for the failure modes given in Table 17.3.1.1 assuming the concrete is cracked unless it can be demonstrated that the concrete remains uncracked :
( c ) 0.75ϕN pn for a single anchor or for the most highly stressed individual anchor in a group of anchors
PROFIS Engineering calculates nominal pullout strength in tension ( N pn
) per ACI 318-14 Eq . ( 17.4.3.1 ). Although not referenced in ACI 318-14 Section 17.4.3.2 , pullout failure in lieu of bond failure must be considered for Hilti HIT-HY 200 used with HIT-Z ( carbon steel ) or HIT-Z-R ( stainless steel ) threaded rods . Characteristic pullout strength values derived from testing per the ICC-ES acceptance criteria AC308 in conjunction with the ACI test standard ACI 355.4 are used to calculate a nominal pullout strength ( N pn
) for HIT-HY 200 when used with HIT-Z / Z-R threaded rods . These characteristic values are shown as “ N p , cr
” and “ N p , uncr
” in Table 10 of ICC-ESR-3187 . Table 10 also includes ϕ-factors derived from testing per AC308 / ACI 355.4 , which are shown as “ ϕ d
” and “ ϕ ws
”. When modeling static load conditions for HIT-Z / Z-R threaded rods used with HY 200 , PROFIS Engineering uses the N p , xxxx
-values and ϕ-factors given in Table 10 of ICC-ESR-3187 to calculate the design pullout strength . The ICC-ESR ϕ-factors correspond to “ Condition B ” as defined in ACI 318-14 Section 17.3.3 , and are designated “ ϕ concrete
” in the PROFIS Engineering report . Design pullout strength for static load conditions is designated “ ϕN pn
” in the PROFIS Engineering report , and is calculated as “ ϕ concrete
N pn
” using the relevant N p , xxxx
-values and ϕ-factors from ICC-ESR-3187 Table 10 . If seismic load conditions are being modeled ; PROFIS Engineering applies the additional 0.75 reduction factor to “ ϕ concrete
N pn
” per ACI 318-14 Section 17.2.3.4.4 , and designates this factor “ ϕ seismic ”. The PROFIS Engineering report parameter “ ϕN pn
” corresponds to “ ϕ seismic ϕ concrete
N pn
”.
Reference the Equations and Results section of the report for more information on the parameter N pn
.
Reference the Results section of the report for more information on the parameters ϕ concrete and ϕ seismic
.
When modeling mechanical anchors in PROFIS Engineering , Reference the Equations and Results section of the report for information on the pullout parameter ϕN pn , f ́c
.
When modeling cast-in anchors , PROFIS Engineering calculates nominal the pullout strength in tension ( N pn
) per ACI 318-14 Eq . ( 17.4.3.1 ), and the parameter N p per ACI 318-14 Eq . ( 17.4.3.4 ). Reference the cast-in anchor report sections relevant to pullout strength in tension for more information .
101 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions