2.0 SHEAR
2.5 Steel Failure with Lever Arm
Variables ϕN ua
( continued )
Equations ETAG 001 Annex C Provision Comments for PROFIS Engineering
ϕN ua
ACI 318-19 strength design provisions for anchors in tension check a calculated design strength ( фN N
) against a factored tension load ( N ua
). The parameter “ tension design steel strength ” is defined as the product of the “ nominal steel strength in tension ” ( N Sa
) and the strength reduction factor ( ф-factor ) for steel failure in tension . PROFIS Engineering designates this reduction factor “ ф steel
”. The calculated value for “ design steel strength in tension ” in PROFIS Engineering corresponds to “ ф steel
N Sa
”.
The parameters “ ф steel
N Sa
” and “ N ua
” in Part 3.1 of the PROFIS Engineering report are used to calculate the tension reduction factor ( 1 - N ua
/ фN sa
), which is used in the modified ETAG 001 Equation ( 5.5a ) to calculate the parameter “ M S
”. ф steel
N Sa is calculated for a single anchor and N ua corresponds to either the only tension load acting on an anchor in tension , or the highest tension load acting on an individual anchor within an anchor group in tension .
Reference the Equations and Calculations section of the PROFIS Engineering report for more information on the parameter ( 1 - N ua
/ фN sa
).
322 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-19 Provisions