Geoscience Reference
In-Depth Information
21.11 Working loads for tubular steel piles
•
Steel tube piles are useful where large lateral load apply, eg jetties and mooring
dolphins.
•
They can accommodate large working loads and have large effective lengths.
•
The working load depends on the pile size, and grade of steel.
Table 21.11
Maximum working loads for end bearing steel tubular piles (from Weltman and Little,
1977).
Outside diameter
Typical working load (kN) per pile
Approximate maximum effective length (m)
(mm)
Mild steel
High yield stress steel
Mild steel
High yield stress steel
(kN)
(kN)
300
400-800
600-1200
11
9
450
800-1500
1100-2300
16
14
600
1100-2500
1500-3500
21
19
750
1300-3500
1900-5000
27
24
900
1600-5000
2400-7000
32
29
•
Loads are based on a maximum tress of 0.3
×
minium yield stress of the steel.
•
The effective length is based on axial loading only.
•
The loads shown are reduced when the piles project above the soil level.
21.12 Working loads for steel H piles
•
Steel tube piles are useful as tension piles.
•
They can accommodate large working loads. While H- piles have high driveability,
it is prone to deflection if boulders are struck, or at steeply inclined rock head levels.
Table 21.12
Maximum working loads for end bearing steel H - piles (from Weltman and Little, 1977).
Size
Typical working load (kN) per pile
Approximate maximum effective length (m)
(mm)
Mild steel
High yield stress steel
Mild steel
High yield stress steel
(kN)
(kN)
200
×
200
400-500
600-700
5
4
250
250
600-1500
800-2000
7
6
×
300
300
700-2400
1000-3500
8
7
×
21.13 Load carrying capacity for piles
•
The pile loads are distributed between the base and shaft of the pile.
•
Piles may be referred to as end bearing or frictional piles. These represent material
idealisations since end- bearing would have some minor frictional component,
and frictional piles would have some minor end-bearing component. The terms
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