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α corner
=
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1 + c a2 c a1
4
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17.6.4.1 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 ƒ ́c ( 17.6.4.1 )
17.6.4.1.1 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 .
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When modeling a single anchor in tension , the side-face blowout strength for a single anchor ( N sb
) is calculated per Eq . ( 17.6.4.1 ), and modified by the factor
( 1 + c a2
/ c a1 )/ 4 if a corner exists . PROFIS Engineering designates the factor
( 1 + c a2
/ c a1 )/ 4 as “ α corner
”. The parameter “ c a1
” corresponds to the distance from the center of the anchor to the nearest fixed edge where side-face blowout is assumed to occur . When two or more fixed edges create a corner , the parameter
c a2 corresponds to the fixed edge perpendicular to c a1 such that c a1
< c a2
. Per the provisions given in 17.6.4.1 , PROFIS Engineering does not calculate “ α corner
” if c a2
≥ 3c a1 . The report will show α corner
= 1.0 if c a2 > 3c a1
.
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Table 17.9.2 ( a ) — Minimum spacing and edge distance requirements
Anchor type
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PROFIS Engineering only performs side-face blowout calculations for the cast-in anchors in its portfolio . The software uses the minimum edge distance requirements given in Table 17.9.2 ( a ) for these anchors . |
Minimum edge distance |
Not torqued
Cast-in anchors
Specified cover requirements for reinforcement according to 20.5.1.3
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Torqued
6d a
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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 )
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Reference the Variables section of the report for more information on the parameters c a1 and c a2
.
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Reference the Equations , Calculations and Results section of the report for more information on the parameter N sb
.
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