PART 3 TENSION LOAD
Side-Face Blowout Failure
Variables A brg
Variables ACI 318-14 Chapter 17 Provision Comments for PROFIS Engineering
A brg
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 cast-in anchor portfolios for bearing area ( A brg ).
MATERIAL SPECIFICATION
AWS D1.1 Type B Headed Stud
" ASTM F1554 Headed Bolt Gr . 36 , Gr . 55 , Gr . 105 "
Diameter ( d 0
) ( in )
Bearing area ( A brg in 2 ) welded headed stud
Bearing area ( A brg in 2 ) square head bolt
Bearing area ( A brg in 2 ) heavy square bolt
Bearing area ( A brg in 2 ) hex head bolt
Bearing area ( A brg in 2 ) heavy hex head bolt
0.500 |
0.589 |
0.625 |
0.920 |
0.750 |
0.785 |
0.875 |
0.884 |
0.500 |
0.464 |
0.569 |
0.291 |
0.467 |
0.625 |
0.693 |
0.822 |
0.454 |
0.671 |
0.750 |
0.824 |
1.210 |
0.654 |
0.911 |
0.875 |
1.121 |
1.465 |
0.891 |
1.188 |
1.000 |
1.465 |
1.855 |
1.163 |
1.501 |
1.125 |
1.854 |
2.291 |
1.472 |
1.851 |
1.250 |
2.228 |
2.773 |
1.817 |
2.237 |
1.375 |
2.769 |
3.300 |
2.199 |
2.659 |
1.500 |
3.295 |
3.873 |
2.617 |
3.118 |
1.750 |
|
|
|
4.144 |
2.000 |
|
|
|
5.316 |
The parameter “ N sb
” in Eq . ( 17.4.4.1 ) is defined as the “ side-face blowout strength of a single anchor ”. It forms the basis for all side-face blowout calculations .
N sb is multiplied by additional factors if designing a single anchor in a corner , or designing a group of anchors subject to possible blowout failure . PROFIS Engineering only considers side-face blowout failure when modeling cast-in anchors . The PROFIS Engineering cast-in anchor 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 )
J-bolts and L-bolts are not included in the PROFIS Engineering cast-in anchor portfolio .
PROFIS Engineering utilizes the bearing area parameters ( A brg ) shown in the table to the left to calculate the parameter N sb per Eq . ( 17.4.4.1 ) for the cast-in anchors in its portfolio .
Reference the Variables section of the report for more information on the parameters c a1
, c a2 , λ a
, f ́c and s .
Reference the Calculations section of the report for more information on the parameter N sb
.
112 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions