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1810.3.2.6 Allowable Stresses
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The allowable stresses for materials used in deep foundation elements shall not exceed those specified in Table 1810.3.2.6.
TABLE 1810.3.2.6
ALLOWABLE STRESSES FOR MATERIALS USED IN DEEP FOUNDATION ELEMENTS
| MATERIAL TYPE AND CONDITION | MAXIMUM ALLOWABLE STRESSa |
| 1. Concrete or grout in compressionb | |
Cast-in-place with a permanent casing in accordance with Section 1810.3.2.7 or Section 1810.3.5.3.4 |
0.4 f 'c
|
Cast-in-place in other permanent casing or rock |
0.33 f 'c
|
Cast-in-place without a permanent casing |
0.3 f 'c
|
Precast nonprestressed |
0.33 f 'c
|
Precast prestressed |
0.33 f 'c - 0.27 fpc
|
| 2. Nonprestressed reinforcement in compression | 0.4 fy ≤ 30,000 psi |
| 3. Steel in compression | |
Cores within concrete-filled pipes or tubes |
0.5 Fy ≤ 32,000 psi
|
Pipes, tubes or H-piles, where justified in accordance with Section 1810.3.2.8 |
0.5 Fy ≤ 32,000 psi
|
Pipes or tubes for micropiles |
0.4 Fy ≤ 32,000 psi
|
Other pipes, tubes or H-piles |
0.35 Fy ≤ 24,000 psi
|
|
0.6 Fy ≤ 0.5 Fu
|
|
| 4. Nonprestressed reinforcement in tension | |
Within micropiles |
0.6 fy
|
Other conditions |
|
For load combinations that do not include wind or seismic loads |
0.5 fy ≤ 30,000 psi
|
For load combinations that include wind or seismic loads |
0.5 fy ≤ 40,000 psi
|
| 5. Steel in tension | |
Pipes, tubes or H-piles, where justified in accordance with Section 1810.3.2.8 |
0.5 Fy ≤ 32,000 psi
|
Other pipes, tubes or H-piles |
0.35 Fy ≤ 24,000 psi
|
|
0.6 Fy ≤ 0.5 Fu
|
|
| 6. Timber | In accordance with the ANSI/AWC NDS |
- f 'c is the specified compressive strength of the concrete or grout; fpc is the compressive stress on the gross concrete section due to effective prestress forces only; fy is the specified yield strength of reinforcement; Fy is the specified minimum yield stress of steel; Fu is the specified minimum tensile stress of structural steel.
- The stresses specified apply to the gross cross-sectional area of the concrete for precast prestressed piles and to the net cross-sectional area for all other piles. Where a temporary or permanent casing is used, the inside face of the casing shall be considered the outer edge of the concrete cross-section.
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