PROFIS Design Guide: US-EN Summer 2021 | Page 310

PART 4 SHEAR LOAD

Steel Failure Mode
Results ϕ steel
Results 318-14 Chapter 17 Provision Comments for PROFIS Engineering
ϕ steel
17.3.3 Strength reduction factor ϕ-for anchors in concrete shall be as follows when the load combinations of 5.3 are used :
( a ) Anchor governed by strength of a ductile steel element ( i ) Tension loads ........................................... 0.75 ( ii ) Shear loads ............................................ 0.65
( b ) Anchor governed by strength of a brittle steel element ( i ) Tension loads ........................................... 0.65 ( ii ) Shear loads ............................................ 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
AWS D1.1
ASTM F 1554
ASTM F 1554
ASTM F 1554
GRADE OR TYPE
DIAMETER ( d 0
) ( in )
TENSILE STRENGTH ( f uta
)
( ksi )
YIELD STRENGTH ( f 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 318-14 strength design provisions for steel failure in shear require calculation of a nominal steel strength ( V sa
). The nominal strength is multiplied by a strength reduction factor ( ϕ- factor ) to obtain a design strength ( ϕV sa
). ACI 318 anchoring-toconcrete 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 “ ϕ steel
”.
When designing cast-in-place anchors , PROFIS Engineering uses the ϕ-factors given in ACI 318-14 Section 17.3.3 . The ϕ steel
-values for the cast-in-place anchors in the PROFIS Engineering portfolio correspond to the ϕ-factors given in Section 17.3.3 for ductile steel elements . In the absence of product-specific data , the ϕ-factors in Section 17.3.3 can be used as guide values for post-installed anchors ; however , ϕ-factors derived from product-specific testing should always be used for the actual design of post-installed anchors .
Post-installed mechanical anchors can be shown compliance 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 shown compliance 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-ESR for the anchor . The ϕ-factors in the ICC-ESR correspond to the ACI 318 ϕ-factors for “ ductile steel element ” and “ 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 :
V sa
: Nominal steel strength in tension
ϕV sa
: Design steel strength in tension
ϕ nonductile
: Seismic strength reduction factor
310 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-14 Provisions