PART 4 SHEAR LOAD
Steel Failure Mode
Equation V sa = A se , V f uta
Equation 318-14 Chapter 17 Provision Comments for PROFIS Engineering
V sa
= A se , V f uta
17.5.1.1 The nominal strength of an anchor in shear as governed by steel , V sa
, shall be evaluated by calculations based on the properties of the anchor material and the physical dimensions of the anchor . Where concrete breakout is a potential failure mode , the required steel shear strength shall be consistent with the assumed breakout surface .
17.5.1.2 The nominal strength of an anchor in shear , V sa , shall not exceed ( a ) through ( c ):
( a ) For cast-in headed stud anchor
V sa
= A se , V f uta
( 17.5.1.2a ) where A se , V is the effective cross-sectional area of an anchor in shear , in . 2 , and f uta shall not be taken greater than the smaller of 1.9f ya and 125,000 psi .
…………………………………………………..
PROFIS Engineering AWS D1.1 headed stud portfolio parameters for calculating V sa .
MATERIAL SPECIFICATION
AWS D1.1
GRADE OR TYPE
ANCHOR DIAMETER ( d 0
) ( in )
TENSILE STRENGTH ( f uta
) ( ksi )
YIELD STRENGTH ( f ua
) ( ksi )
GROSS AREA ( in 2 )
B 0.500 65 51 0.196 B 0.625 65 51 0.307 B 0.750 65 51 0.442 B 0.875 65 51 0.601
EFFECTIVE AREA ( A se
) ( in 2 )
ACI 318-14 Chapter 2 defines the parameter V sa as follows :
“ nominal shear strength of a single anchor or individual anchor in a group of anchors as governed by the steel strength ”.
V sa is always calculated for a single anchor when designing with ACI 318-14 provisions .
For cast-in headed studs , PROFIS Engineering calculates V sa using Equation ( 17.5.1.2a ). The PROFIS Engineering cast-in headed stud portfolio is as follows :
• AWS D1.1 Type B headed studs ( 1 / 2 ” – 7 / 8 ” nominal diameter )
The table to the left shows the parameters used by PROFIS Engineering to calculate V sa for the headed stud portfolio .
Reference the Calculations and Results section of the report for more information on V sa
.
Reference the Variables section of the report for more information on the parameters A se , V and f uta
.
295 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions