1.0 TENSION
1.5 Steel Failure Mode
Results ϕ steel
Results ACI 318-19 Chapter 17 Provision Comments for PROFIS Engineering
ϕ steel
17.5.3 Strength reduction factor ϕ for anchors in concrete shall in accordance with Tables 17.5.3 ( a )……………………..
Table 17.5.3 ( a ) Anchor strength governed by steel
Type of steel element
Strength reduction factor ϕ
Tension ( steel ) Shear ( steel ) Ductile 0.75 0.65
Brittle 0.65 0.60
PROFIS Engineering cast-in-place anchor portfolio .
• AWS D1.1 : 1 / 2 ” – 7 / 8 ” diameters
• hex head , square head , heavy square head : 1 / 2 ” – 1 1 / 2 ” diameters
• heavy hex head : 1 / 2 ” – 2 ” diameters
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 strength design provisions for steel failure in tension require calculation of a nominal steel strength ( N sa
). The nominal strength is multiplied by one or more strength reduction factors ( ϕ-factors ) to obtain a design strength ( ϕN sa
). ϕ-factors are relevant to static and seismic load conditions . ACI 318 anchoring-to-concrete provisions have traditionally defined ductile steel elements and brittle steel elements as follows :
• ductile steel element — an element with a tensile test elongation of at least 14 percent and reduction in area of at least 30 percent .
• brittle steel element — an element with a tensile test elongation of less than 14 percent , or reduction in area of less than 30 percent , or both .
PROFIS Engineering designates the ϕ-factor corresponding to steel failure for static load conditions “ ϕ steel
”. When designing cast-in-place anchors , PROFIS Engineering uses the ϕ-factors given in ACI 318-19 Table 17.5.3 ( a ). The
ϕ steel
-values for the cast-in-place anchors in the PROFIS Engineering portfolio correspond to the ϕ-factors given in Table 17.5.3 ( a ) for ductile steel elements . ϕ-factors derived from product-specific testing should always be used for the design of post-installed anchors .
Post-installed mechanical anchors can be qualified for recognition under the International Building Code via testing per the ICC-ES acceptance criteria AC193 in conjunction with the ACI standard ACI 355.2 . Post-installed adhesive anchor systems can be qualified for recognition under the International Building Code via testing per the ICC-ES acceptance criteria AC308 in conjunction with the ACI standard ACI 355.4 . PROFIS Engineering uses the ϕ-factors derived from AC193 / ACI 355.2 or AC308 / ACI 355.4 testing , as given in the ICC-ES evaluation report ( ESR ) for the anchor . The ϕ-factors in the ESR correspond to the ACI 318 ϕ-factors for “ ductile steel element ” or “ brittle steel element ”, as determined by the product testing and material properties for a specific anchor element .
Reference the Results section of the PROFIS Engineering report for more information on the following parameters :
N sa
: nominal steel strength in tension .
ϕN sa
: design steel strength in tension .
ϕ nonductile
: seismic strength reduction factor .
147 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-19 Provisions