PART 4 SHEAR LOAD
Stand-off Failure Mode
Variables N ua
( continued )
Variables 318-14 Chapter 17 Provision Comments for PROFIS Engineering
N ua
PROFIS Engineering report uses the generic designation “ N ua
” to reference 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 . The PROFIS Engineering Load Engine permits users to input service loads that will then be factored per IBC factored load equations . Users can also import factored load combinations via a spreadsheet , or input factored load combinations directly on the main screen . When considering the tension reduction factor ( 1 - N ua
/ ϕN sa ) for stand-off calculations , PROFIS Engineering uses the N ua
-value ( a ) calculated with the Load Engine , ( b ) determined from the loads imported from a spreadsheet or ( c ) determined from the loads input in the matrix on the main screen . This value is shown as “ N ua
” in Part 3.1 of the PROFIS Engineering report , and corresponds to the highest factored tension load determined to be acting on an individual anchor . When modeling a stand-off application subjected to shear and tension loads ; PROFIS Engineering uses the N ua
-value in Part 3.1 of the report to calculate the tension reduction factor ( 1 - N ua / ϕN sa
), which is used in the modified ETAG 001 Equation ( 5.5a ) to calculate the parameter “ M S
”.
Reference the Equations and Calculations section of the PROFIS Engineering report for more information on the parameter ( 1 - N ua
/ ϕN sa
).
330 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions