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ψ ec , Na
=
|
1
1 + e ́N
c Na
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≤ 1.0 |
17.4.5.3 The modification factor for adhesive anchor groups loaded eccentrically in tension , ψ ec , Na shall be calculated as :
ψ ec , Na
=
1
( 17.4.5.3 )
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ψ ec , Na is a modification factor that is used to account for a resultant tension load that is eccentric with respect to the centroid of anchors that are loaded in tension .
ψ ec , Na is only considered when calculating the nominal bond strength in tension for an anchor group ( N ag
).
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but ψ ec , Na shall not be taken greater than 1.0 . |
1 + e ́N
c Na
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Reference the Variables section of the PROFIS Engineering report for more information on the following parameters :
e c1 , N
: Parameter for tension eccentricity with respect to the x direction
e c2 , N
: Parameter for tension eccentricity with respect to the y direction
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If the loading on an adhesive anchor group is such that only some adhesive anchors are in tension , only those adhesive anchors that are in tension shall be considered when determining the eccentricity e ́N for use in Eq . ( 17.4.5.3 ) and for the calculation of N ag according to Eq . ( 17.4.5.1b ).
In the case where eccentric loading exists about two orthogonal axes , the modification factor ,
ψ ec , Na
, shall be calculated for each axis individually and the product of these factors used as ψ ec , Na in Eq . ( 17.4.5.1b ).
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Reference the Calculations section of the PROFIS Engineering report for more information on the following parameters :
c Na
: Projected distance from an adhesive anchor
ψ ec1 , N
: Modification factor for tension eccentricity with respect to the x direction
ψ ec2 , N
: Modification factor for tension eccentricity with respect to the y direction
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||||
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ψ ed , Na
= 0.7 + 0.3
|
c a , min ≤1 . 0
c Na
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17.4.5.4 The modification factor for edge effects for single adhesive anchors or adhesive anchor groups loaded in tension , ψ ed , Na
, shall be calculated as
If c a , min
≥ c Na , then ψ ed , Na
= 1.0 ( 17.4.5.4a )
If c a , min < c Na
, then ψ ed , Na = 0.7 + 0.3
c a , min ( 17 . 4 . 5 . 4b )
c Na
|
ψ ed , Na is a modification factor that is used to account for fixed edge distances less than c Na
, where c Na corresponds to a projected distance from the center of the adhesive anchor element being modeled in PROFIS Engineering . The illustration below shows how the assumed area of influence ( A Na
) would be defined for an adhesive anchoring application being modeled with two fixed edges ( c a1 and c a2 ) that are both less than c Na , 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 , Na .
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ψ ed , Na
= 0.7 + 0.3 ( c a1 / c Na
)
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Reference the Variables section of the PROFIS Engineering report for more information on the following parameter :
c a , min
: Parameter for the smallest fixed edge being modeled
|
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|
Reference the Calculations section of the PROFIS Engineering report for more information on the following parameter :
c Na
: Projected distance from an adhesive anchor
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