|
ψ ed , Na
= 0.7 + 0.3
|
c a , min ≤ 1 . 0
c Na
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17.4 . 2 . 5 The modification factor for edge effects for single anchors or anchor groups loaded in tension , ψ ed , N
, shall be calculated as
If c a , min ≥ 1.5h ef
, then ψ ed , Na = 1.0 ( 17.4.2.5a )
If c a , min < 1.5h ef
, then ψ ed , Na = 0.7 + 0.3
c a , min ( 17 . 4 . 2 . 5b )
1.5h ef
|
When calculating the nominal concrete pryout strength in shear ( V cp or V cpg
), the parameter ψ ed , N is a modification factor that accounts for fixed edge distances less than 1.5h ef , where h ef corresponds to the effective embedment depth that has been selected for the anchor being modeled in PROFIS Engineering . The illustration below shows how the assumed area of influence with respect to pryout ( A Nc
) would be defined for an anchoring application being modeled with two fixed edges ( c a1 and c a2 ) that are both less than 1.5h ef
, and with c a1 being less than c a2
.
The smallest edge distance ( c a1 ) corresponds to the parameter c a , min
, and would be used to calculate the modification factor ψ ed , N .
|
|
|
ψ ed , N
= 0.7 + 0.3 ( c a1 / 1.5h ef
)
|
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It is important to understand that “ ψ ed , N
” calculated for concrete breakout failure in tension is not necessarily the same as “ ψ ed , N
” calculated for concrete pryout failure in shear since the number of anchors in tension may not be the same as the number of anchors in shear .
|
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Reference the Variables section of the PROFIS Engineering report for more information on the following parameters : |
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c a , min
: Parameter for the smallest fixed edge being modeled
|
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h ef
: Parameter for anchor effective embedment depth
|
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Reference the Calculations section of the PROFIS Engineering report for more information on ψ ed , N when calculating concrete pryout strength . |