|
ψ ec , N
=
|
1
1 + e ́N
1.5h ef
|
≤ 1.0 |
17.6.2.3.1 Modification factor for anchor groups loaded eccentrically in tension , ψ ec , N , shall be calculated by Eq . ( 17.6.2.3.1 )
ψ ec , N
=
1
( 17.6.2.3.1 )
|
ψ ec , N 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 , N is only considered when calculating the nominal concrete breakout strength in tension for an anchor group ( N cbg
).
|
|
1 + e ́N
1.5h ef
17.6.2.3.2 If the loading on an anchor group is such that only some of the anchors in the group are in tension , only those anchors that are in tension shall be considered for determining eccentricity
e ́N in Eq . ( 17.6.2.3.1 ) and for the calculation of N cbg according to Eq . ( 17.6.2.1b ).
17.6.2.3.3 If the loading is eccentric with respect to two orthogonal axes , the modification factor ,
ψ ec , N
, shall be calculated for each axis individually and the product of these factors shall be used as ψ ec , N in Eq . ( 17.6.2.1b ).
|
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
h ef
: parameter for anchor effective embedment depth .
Reference the Calculations section of the PROFIS Engineering report for more information on the following parameters :
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
|
|
ψ ed , N
= 0.7 + 0.3
|
c a , min ≤1 . 0
1.5h ef
|
17.6 . 2.4.1 Modification factor for edge effects for single anchors or anchor groups loaded in tension , ψ ed , N
, shall be determined by ( a ) or ( b ).
( a ) If c a , min ≥ 1.5h ef
, then ψ ed , N = 1.0 ( 17.6.2.4.1a )
( b ) If c a , min < 1.5h ef
, then ψ ed , N = 0.7 + 0.3
c a , min ( 17 . 6 . 2 . 4 . 1b )
1.5h ef
|
ψ ed , N is a modification factor that is used to account for fixed edge distances less than 1.5h ef
, where hef 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 ( 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
)
|
|||
|
Reference the Variables section of the PROFIS Engineering report for more information on the following parameters :
c a , min
: parameter for the smallest fixed edge being modeled .
h ef
: parameter for anchor effective embedment depth .
|