1.0 TENSION
1.5 Steel Failure Mode
Variables ƒ uta
Variables ACI 318-19 Chapter 17 Provision Comments for PROFIS Engineering ƒuta
17.6.1.1 Nominal strength of anchors in tension as governed by the steel , N sa
, shall be evaluated based on the properties of the anchor material and the physical dimensions of the anchors .
17.6.1.2 Nominal steel strength of an anchor in tension , N sa , shall be calculated by
N sa
= A se , N ƒ uta
( 17.6.1.2 ) where A se , N is the effective cross-sectional area of an anchor in tension , in . 2 , and ƒ uta used for calculations shall not exceed either 1.9ƒ ya or 125,000 psi . PROFIS Engineering cast-in-place anchor portfolio values for ƒ ya and ƒ uta .
MATERIAL SPECIFICATION
AES D1.1
ASTM F 1554
ASTM F 1554
ASTM F 1554
GRADE OR TYPE
DIAMETER ( d 0
) ( in )
TENSILE STRENGTH ( ƒ uta
) ( ksi )
YIELD STRENGTH
( ƒ ya ) ( ksi )
GROSS AREA ( in 2 )
EFFECTIVE AREA ( A se
)
( 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 |
|
36 |
0.500 |
58 |
36 |
0.196 |
0.142 |
36 |
0.625 |
58 |
36 |
0.307 |
0.226 |
36 |
0.750 |
58 |
36 |
0.442 |
0.334 |
36 |
0.875 |
58 |
36 |
0.601 |
0.462 |
36 |
1.000 |
58 |
36 |
0.785 |
0.606 |
36 |
1.125 |
58 |
36 |
0.994 |
0.763 |
36 |
1.250 |
58 |
36 |
1.227 |
0.969 |
36 |
1.375 |
58 |
36 |
1.485 |
1.160 |
36 |
1.500 |
58 |
36 |
1.767 |
1.410 |
36 |
1.750 |
58 |
36 |
2.405 |
1.900 |
36 |
2.000 |
58 |
36 |
3.142 |
2.500 |
55 |
0.500 |
75 |
55 |
0.196 |
0.142 |
55 |
0.625 |
75 |
55 |
0.307 |
0.226 |
55 |
0.750 |
75 |
55 |
0.442 |
0.334 |
55 |
0.875 |
75 |
55 |
0.601 |
0.462 |
55 |
1.000 |
75 |
55 |
0.785 |
0.606 |
55 |
1.125 |
75 |
55 |
0.994 |
0.763 |
55 |
1.250 |
75 |
55 |
1.227 |
0.969 |
55 |
1.375 |
75 |
55 |
1.485 |
1.160 |
55 |
1.500 |
75 |
55 |
1.767 |
1.410 |
55 |
1.750 |
75 |
55 |
2.405 |
1.900 |
55 |
2.000 |
75 |
55 |
3.142 |
2.500 |
105 |
0.500 |
125 |
105 |
0.196 |
0.142 |
105 |
0.625 |
125 |
105 |
0.307 |
0.226 |
105 |
0.750 |
125 |
105 |
0.442 |
0.334 |
105 |
0.875 |
125 |
105 |
0.601 |
0.462 |
105 |
1.000 |
125 |
105 |
0.785 |
0.606 |
105 |
1.125 |
125 |
105 |
0.994 |
0.763 |
105 |
1.250 |
125 |
105 |
1.227 |
0.969 |
105 |
1.375 |
125 |
105 |
1.485 |
1.160 |
105 |
1.500 |
125 |
105 |
1.767 |
1.410 |
105 |
1.750 |
125 |
105 |
2.405 |
1.900 |
105 |
2.000 |
125 |
105 |
3.142 |
2.500 |
ACI 318-19 Equation 17.6.1.2 includes the parameter ƒ uta to calculate the nominal steel strength in tension ( N sa ). ACI 318-19 Chapter 2 defines ƒ uta as the “ specified tensile strength of anchor steel ”. ICC-ES evaluation reports ( ESR ’ s ) for post-installed anchors include values for the “ minimum specified ultimate strength ”. Unlike reinforced concrete design , which uses bar yield strength ( ƒ y
) for calculations ; ACI 318 anchoring-to-concrete provisions use the ultimate tensile strength of an anchor element ( ƒ uta
) to calculate the nominal steel strength in tension ( N sa
). The ACI 318-19 commentary R17.6.1.2 notes :
“ The nominal strength of anchors in tension is best represented as a function of ƒ uta rather than ƒ ya because the large majority of anchor materials do not exhibit a well-defined yield point ”.
The PROFIS Engineering cast-in-place anchor portfolio includes the following anchors :
• AWS D1.1 Type B headed studs ( 1 / 2 ” — 7 / 8 ” nominal diameter )
• ASTM F1554 hex head bolt , Gr . 36 , Gr . 55 , Gr . 105 ( 1 / 2 ” — 1-1 / 2 ” nominal diameter )
• ASTM F1554 heavy hex head bolt , Gr . 36 , Gr . 55 , Gr . 105 ( 1 / 2 ” — 2 ” nominal diameter )
• ASTM F1554 square head bolt , Gr . 36 , Gr . 55 , Gr . 105 ( 1 / 2 ” — 1-1 / 2 ” nominal diameter )
• ASTM F1554 heavy square head bolt , Gr . 36 , Gr . 55 , Gr . 105 ( 1 / 2 ” — 1-1 / 2 ” nominal diameter )
The table to the left shows the ƒ ya and ƒ uta values for the PROFIS Engineering castin-place anchor portfolio . PROFIS Engineering uses the ƒ uta values to calculate N sa per Equation ( 17.6.1.2 ).
Post-installed anchor ESR ’ s include pre-calculated values for the nominal steel strength of an anchor element ( N sa
). ƒ uta
-values may also be given in an ESR ; however , PROFIS Engineering uses the pre-calculated N sa
-values instead of calculating N sa per Equation ( 17.6.1.2 ).
Reference the Calculations and Results section of the PROFIS Engineering report for more information on :
N sa
: nominal steel strength in tension .
Reference the Variables section of the PROFIS Engineering report for more information on :
A se , N
: tensile stress area of an anchor element .
141 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-19 Provisions