PROFIS Design Guide: US-EN Summer 2021 | Page 121

PART 3 TENSION LOAD

Side-Face Blowout Failure
Results N sb
Results ACI 318-14 Chapter 17 Provision Comments for PROFIS Engineering
N sb
17.4.4.1 For a single headed anchor with deep embedment close to an edge ( h ef
> 2.5c a1 ), the nominal side-face blowout strength , N sb , shall not exceed
N sb
= 160c a1
A brg λ a f ́c ( 17.4.4.1 )
If c a2 for the single headed anchor is less than 3c a1
, the value of N sb shall be multiplied by the factor
( 1 + c a2
/ c a1 )/ 4 , where 1.0 ≤ c a2
/ c a1 ≤ 3.0 .
PROFIS Engineering permits h ef
-values ranging between 4danchor and 25 ” to be input for the cast-in anchors in its portfolio . PROFIS Engineering designates the factor ( 1 + c a2
/ c a1 )/ 4 as “ α corner
”.
PROFIS Engineering calculation for N sb :
N sb
= 160 α corner c a1
A brg λ a f ́c
PROFIS Engineering calculates side-face blowout when the anchor effective embedment depth ( h ef
) is greater than 2.5 times the nearest fixed edge ( c a1
). When modeling a single anchor in tension , the side-face blowout strength for a single anchor ( N sb
) is calculated per Eq . ( 17.4.4.1 ), and modified by the factor ( 1 + c a2
/ c a1 )/ 4 if a corner formed by the fixed edge distances c a1 and c a2 exists . PROFIS
Engineering designates this factor “ α corner ”. The parameter c a2 corresponds to the fixed edge perpendicular to c a1
.
PROFIS Engineering only performs side-face blowout calculations for the cast-in anchors in its portfolio . This portfolio is as follows :
• AWS D1.1 Type B headed studs : ( 1 / 2 ” – 7 / 8 ” nominal diameter )
• ASTM F1554 hex head bolt , Gr . 36 , Gr . 55 , Gr . 105 : ( 1 / 2 ” – 1 1 / 2 ” nominal diameter )
• ASTM F1554 heavy hex head bolt , Gr . 36 , Gr . 55 , Gr . 105 : ( 1 / 2 ” – 2 ” nominal diameter )
• ASTM F1554 square head bolt , Gr . 36 , Gr . 55 , Gr . 105 : ( 1 / 2 ” – 1 1 / 2 ” nominal diameter )
• ASTM F1554 heavy square head bolt , Gr . 36 , Gr . 55 , Gr . 105 : ( 1 / 2 ” – 1 1 / 2 ” nominal diameter )
Values for bearing area ( A brg ) used by PROFIS Engineering to calculate N sb are shown to the left .
The software uses the minimum spacing requirements given in Section 17.7.1 and the minimum edge distance requirements given in Section 17.7.2 for cast-in anchors .
λ a is a modification factor for lightweight concrete . PROFIS Engineering uses the provisions of Sections 17.2.6 and 19.2.4 to calculate λ a
.
f ́c corresponds to the concrete compressive strength being modeled . PROFIS Engineering uses the provisions of Section 17.2.7 to calculate f ́c .
Reference the Variables section of the report for more information on the parameters c a1
, c a2 , A brg
, λ a
, f ́c and s .
Reference the Equations and Calculations section of the report for more information on the parameter N sb
.
Reference the Equations and Calculations section of the report for more information on the parameter α corner
.
121 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions