1.0 TENSION
1.4 Side Face Blowout Failure Mode
Equations N sb = 160 c a1
( continued )
Equations ACI 318-19 Chapter 17 Provision Comments for PROFIS Engineering anchor group in tension
N sb
= 160c a1
A brg λ a ƒ ́c
17.2.4.1 Modification factor λ a for lightweight concrete shall be in accordance with Table 17.2.4.1 . …………………………………………………..
Table 17.2.4.1 — Modification factor λ a for lightweight concrete
Cast-in and undercut anchor concrete failure
Case λ a
[ 1 ]
Expansion , screw , and adhesive anchor concrete failure
1.0 λ 0.8 λ
Reference the Variables section of the report for more information on the parameters c a1
, c a2 , A brg
, λ a
, ƒ ́c and s .
Reference the Calculations section of the report for more information on the parameters α group and N sb
. Reference the PROFIS Engineering report section for N sb
( single anchor ) for information on the parameter α corner .
Adhesive anchor bond failure per Eq . ( 17.6.5.2.1 )
0.6 λ
[ 1 ] λ shall be in accordance with 19.2.4
17.3.1 The value of ƒ ́c used for calculation purposes in this chapter shall not exceed 10,000 psi for cast-in anchors ………………………..
Equations ϕN sb
Equations ACI 318-19 Chapter 17 Provision Comments for PROFIS Engineering
ϕN sb
≥ N ua
17.5 . 2 For each applicable factored load combination , design strength of anchors shall satisfy the criteria in Table 17.5.2 .
Table 17.5.2 Failure Mode Side-Face Blowout Strength in Tension
Single Anchor
ϕN sb
≥ N ua
ACI 318-19 strength design provisions for tension check a calculated design strength ( ϕN N
) against a factored tension load ( N ua
). The parameter ϕN sb corresponds to the design side-face blowout strength for a single anchor in tension . The parameter N ua corresponds to the factored tension load acting on the anchor . If ϕN sb ≥ N ua for the application being modeled , the provisions of Table 17.5.2 are satisfied for side-face blowout failure .
Reference the Results section of the PROFIS Engineering report for more information on the following parameters :
N sb
: nominal side-face blowout strength in tension
ϕ concrete
: strength reduction factor for side-face blowout failure
ϕ seismic
: strength reduction factor for seismic tension
ϕN sb
: design side-face blowout strength in tension
N ua
: factored load acting on anchors in tension
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 .
107 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-19 Provisions