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APPENDIX 2H
DOCUMENTATION
Chapter 2
Helical Foundation Systems
ESR-3074
|
Most Widely Accepted and Trusted
Page 8 of 9
FIGURE 2—HP288 NEW CONSTRUCTION BRACKET ASSEMBLY
TABLE 4—MECHANICAL PROPERTIES OF 2.875-INCH DIAMETER HELICAL SHAFTS
Mechanical Properties
Un-corroded
After 50 Year Corrosion Loss
Plain Steel
Plain Steel
Hot-dip Galvanized Steel
Steel Minimum Yield Strength, Fy
60 ksi
60 ksi
60 ksi
Steel Minimum Ultimate Strength, Fu
70 ksi
70 ksi
70 ksi
Modulus of Elasticity, E
29,000 ksi
29,000 ksi
29,000 ksi
Nominal Wall Thickness
0.276 in.
0.276 in.
0.276 in.
Design Wall Thickness
0.257 in.
0.221 in.
0.247 in.
Outside Diameter, OD
2.875 in.
2.839 in.
2.865 in.
Inside Diameter, ID
2.361 in.
2.397 in.
2.371 in.
Cross Sectional Area, A
2.11 in
2
1.82 in
2
2.03 in
2
Moment of Inertia, I
1.83 in
4
1.57 in
4
1.76 in
4
Radius of Gyration, r
0.93 in.
0.93 in.
0.93 in.
Elastic Section Modulus, S
1.27 in
3
1.10 in
3
1.23 in
3
Plastic Section Modulus, Z
1.77 in
3
1.52 in
3
1.70 in
3
For
SI:
I inch = 25.4 mm, 1 ksi = 6.895 MPa, 1lbf-ft = 1.356 N-m, 1 lbf = 4.448 N.