|
α corner
=
|
1 + c a2 c a1
4
|
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 .
17.7.2 Unless determined in accordance with 17.7.4 , minimum edge distances for cast-in anchors that will not be torqued shall be based on specified cover requirements for reinforcement in 20.6.1 . For cast-in anchors that will be torqued , the minimum edge distances shall be 6d a
.
|
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 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 17.4.4.1 , 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
.
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 Section 17.7.2 for these anchors .
|
The PROFIS Engineering cast-in anchor portfolio is as follows : |
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• AWS D1.1 Type B headed studs : ( 1 / 2 ” – 7 / 8 ” nominal diameter ) |
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• ASTM F1554 hex head bolt , Gr . 36 , Gr . 55 , Gr . 105 : ( 1 / 2 ” – 1 1 / 2 ” nominal diameter ) |
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• ASTM F1554 heavy hex head bolt , Gr . 36 , Gr . 55 , Gr . 105 : ( 1 / 2 ” – 2 ” nominal diameter ) |
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• ASTM F1554 square head bolt , Gr . 36 , Gr . 55 , Gr . 105 : ( 1 / 2 ” – 1 1 / 2 ” nominal diameter ) |
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• 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
.
|