|
ψ ec , V
=
|
1
1 + 2e ́V
3c a1
|
≤ 1.0 |
17.7.2.3.1 Modification factor for anchor groups loaded eccentrically in shear , ψ ec , V , shall be calculated by Eq . ( 17.7.2.3.1 ).
ψ ec , V
=
1
≤ 1.0 ( 17 . 7.2.3.1 )
|
ψ ec , V is a modification factor that is used to account for a resultant shear load that is eccentric with respect to the centroid of anchors that are loaded in shear . ψ ec , V is only considered when calculating the nominal concrete breakout strength in shear for an anchor group ( V cbg
).
|
|
1 + e ́V
1.5c a1
17.7.2.3 . 2 If the loading on an anchor group is such that only some of the anchors in the group are in shear , only those anchors that are in shear in the same direction shall be considered for determining the eccentricity e ́V in Eq . ( 17.7.2.3.1 ) and for the calculation of V cbg according to Eq .
( 17.7.2.1b ).
|
Reference the Variables section of the PROFIS Engineering report for more information on the following parameters :
e ́V : parameter for shear eccentricity .
c a1
: parameter for edge distance in the direction of the applied shear load .
Reference the Calculations section of the PROFIS Engineering report for more information on ψ ec , V
.
|
|
ψ ed , V
= 0.7 + 0.3
|
c a2 ≤1 . 0
1.5c a1
|
17.7.2.4.1 Modification factor for edge effects for single anchors or anchor groups loaded in shear ,
ψ ed , V
, shall be determined by ( a ) or ( b ) using the lesser value of c a2 .
( a ) If c a2
≥ 1.5c a1 , then ψ ed , V
= 1.0 ( 17.7.2.4.1a )
( b ) If c a2
< 1.5c a1 , then ψ ed , V
= 0.7 + 0.3
c a2 ( 17 . 7 . 2 . 4 . 1b
1.5c a1
|
ψ ed , V is a modification factor that is used to account for fixed edge distances perpendicular to the direction of the applied shear load that are less than
1.5c a1
. Shear concrete breakout failure calculations are predicated on the fixed edge distance in the direction of the applied shear load ( c a1
). Edge distances perpendicular to the direction of the applied shear load are designated c a2
. If c a2 is less than 1.5c a1 , ψ ed , V is calculated per Eq . ( 17.7.2.4.1b ).
For the application in the illustration below :
|
|
ψ ed , V
= 0.7 + 0.3 ( c a2
/ 1.5c a1 )
|
|||
17.7.2.1.2 If anchors are located in narrow sections of limited thickness such that both edge distances c a2 and thickness ha are less than 1.5c a1 , the value of c a1 used to calculate A Vc in accordance with 17.7.2.1.1 as well as for the equations in 17.7.2.1 through 17.7.2.6 shall not exceed the greatest of ( a ) through ( c ). |
|||
( a ) c a2 / 1.5 , where c a2 is the greatest edge distance |
|||
|
( b ) h a
/ 1.5
|
|||
( c ) s / 3 , where s is the maximum spacing perpendicular to direction of shear , between anchors within a group . |