PART 4 SHEAR LOAD
Stand-off Failure Mode
Variables d 0
( continued )
Variables 318-14 Chapter 17 Provision Comments for PROFIS Engineering
d 0
PROFIS Engineering stand-off calculations : without clamping and with grouting
t plate
= plate or fixture thickness z = standoff + 0.5 ( t plate ) n = 0.5 L b = z + ( 0.5 )( d 0
) d 0
= nominal anchor diameter
When “ stand-off without clamping ” or “ stand-off with grouting ” are selected in PROFIS Engineering , ( n )( d 0
) = ( 0.5 )( d 0 ) and L b
= z + ( 0.5 )( d 0 ).
ETAG 001 Annex C : Figure 4.8 Definition of lever arm
5.2.3.2 Steel failure b ) Shear load with lever arm
The characteristic resistance of an anchor , V Rk , s , is given by Equation ( 5.5 ). where
V Rk , s
= α M M Rk , s [ N ] ( 5.5 ) l α M
= see 4.2.2.4 l = lever arm according to Equation ( 4.2 )
M Rk , s
= M 0 ( 1 - N / N ) [ Nm ] ( 5 . 5a )
Rk , s Sd Rd , s
PROFIS Engineering calculations for stand-off with clamping
t plate
= plate or fixture thickness z = standoff + 0.5 ( t plate )
L b
= z
Torque-controlled expansion anchors must be torqued via a nut / washer assembly at the concrete surface . If clamping via a nut / washer assembly occurs , there will be no local spalling at the concrete surface when the anchor is subjected to bending ; therefore , n equals 0 . When “ stand-off with clamping ” is selected in PROFIS Engineering , ( n )( d 0
) = 0 . For a non-grouted stand-off , expansion anchors must be modeled in PROFIS Engineering for “ stand-off with clamping ”.
Reference the Variables section of the report for more information on the following PROFIS Engineering parameters z and d 0
.
Reference the Equations and Calculations section of the report for more information on the PROFIS Engineering parameter L b
.
335 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions