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p 86
APPENDIX 2A
HELICAL PRODUCT RATINGS, PROPERTIES AND DETAILS
Chapter 2
Helical Foundation Systems
HP288NCB8 Bracket Specifications and Capacities
when used with the HP288 Helical Pile System
Bracket Sleeve Material:
Ø
3.500” x 0.250” wall
ASTM A513 Type 5 Grade 1026
Yield strength = 70 ksi (min)
Tensile strength = 80 ksi (min)
Cap Plate Material:
3/4
” x 8.00” square
ASTM A36
Bracket Hardware:
(2) -
Ø
3/4
” Grade 8 bolts with nuts
Electrozinc plated per ASTM B633
Bracket Finish:
Available plain or hot-dip galvanized
(2)
Concrete Bearing Area
(6)
(Compression) = 64.0 in
2
Concrete Bearing Area
(6)
(Tension) = 54.4 in
2
Allowable Bracket Capacity
(4)
R
n
/Ω
Compression
(3)
(kips)
Concrete Bearing
(6)
(ksi)
Tension
(kips)
Concrete Bearing
(6)
(ksi)
2 Bolts
Plain
47.9
0.75
41.6
0.77
Plain Corroded
(1)
43.1
0.68
34.1
0.63
Galvanized Corroded
(1,2)
46.6
0.73
38.1
0.70
1 Bolt
Plain
47.9
0.75
20.8
0.38
Plain Corroded
(1)
43.1
0.68
17.0
0.32
Galvanized Corroded
(1,2)
46.6
0.73
19.1
0.35
0 Bolts
(5)
Plain
47.9
0.75
0
0
Plain Corroded
(1)
43.1
0.68
0
0
Galvanized Corroded
(1,2)
46.6
0.73
0
0
(1)
Corroded capacities include a 50-year scheduled sacrificial loss in thickness per ICC-ES AC358.
(2)
Hot-dip galvanized coating in accordance with ASTM A123.
(3)
Allowable compression capacities consider continuous lateral soil confinement in soils with SPT blow counts ≥ 4. Piles with exposed
unbraced lengths or piles placed in weaker or fluid soils should be evaluated on a case by case basis by the project engineer.
(4)
Listed capacities include limiting mechanical capacities of the shaft when the shaft and bracket are combined as a system. System
capacity should also not exceed the installed allowable torque-correlated soil capacity (See Shaft Specifications and Capacities).
(5)
Applications utilizing no bolts should either be tack welded or utilize some other mechanism to immobilize the bracket and maintain firm
contact between the cap plate and pile shaft throughout construction and concrete placement.
(6)
Concrete bearing values provided are the uniform bearing stresses required to achieve the full corresponding bracket capacity. Allowable
concrete bearing is a function of several project specific variables including depth of embedment, edge distance, and concrete compressive
strength (f’c). When allowable concrete bearing stresses are lower than these values, corresponding bracket capacities can be obtained
by multiplying the actual allowable concrete bearing stress by the respective bearing areas provided, but should not exceed the capacities
listed in this table. Other concrete design checks including shear, bending, and punching of the supported structure are also project
specific and shall be the responsibility of the project engineer.
