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// CODE SNIPPET

3107F.3.3 Timber Piles

California Building Code 2016 (Vol 1 & 2) > 31F [SLC] Marine Oil Terminals > 3107F Structural Analysis and Design of Components > 3107F.3 Timber Piles and Deck Components > 3107F.3.3 Timber Piles
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3107F.3.3.1 Stability

Section 3107F.2.5.2 shall apply to timber piles.

3107F.3.3.2 Displacement Capacity

A distinction shall be made between a pier-type pile, with a long unsupported length and a wharf-landside-type pile with a short unsupported length between the deck and soil. The effective length, L, is the distance between the pinned deck/pile connection and in-ground fixity as shown in Figure 31F-7-15. For pier-type (long unsupported length) vertical piles, three simplified procedures to determine fixity or displacement capacity are described in UFC 4-151-10 [7.12], UFC 3-220-01A [7.13] and Chai [7.14].

In order to determine fixity in soft soils, another alternative is to use Table 31F-7-8.

The displacement capacity, Δ, for a pile pinned at the top, with effective length, L, (see Table 31F-7-8 and UFC 4-151-10 [7.12]), and moment, M, is:

(7-35)

where:

E=Modulus of elasticity
I=Moment of inertia
FIGURE 31F-7-15
ASSUMED IN-GROUND FIXITY

TABLE 31F-7-8
DISTANCE BELOW GROUND TO POINT OF FIXITY
PILE EIgSOFT CLAYSLOOSE GRANULAR & MEDIUM CLAYS
< 1010 lb in210 feet8 feet
> 1010 lb in212 feet10 feet

Assuming linear curvature distribution along the pile, the allowable curvature, ϕa, can be established fromml:

(7-36)

where:

εa = allowable strain limit according to Section 3107F.3.3.3

c = distance to neutral axis which can be taken as Dp/2, where Dp is the diameter of the pile

The curvature is defined as:

(7-37)

The maximum allowable moment therefore becomes:

(7-38)

The displacement capacity is therefore given by:

(7-39)

3107F.3.3.3 Component Acceptance/Damage Criteria

The following limiting strain values apply for each seismic performance level for existing structures:

TABLE 31F-7-9
LIMITING STRAIN VALUES FOR TIMBER
EARTHQUAKE LEVELMAX. TIMBER STRAIN
Level 10.002
Level 20.004

For new and alternatively, for existing structures ANSI/AWC NDS [7.11] may be used.

Timber components for all non-seismic loading combinations shall be designed in accordance with ANSI/AWC NDS [7.11].

3107F.3.3.4 Shear Design

To account for material strength uncertainties, the maximum shear demand, Vmax, established from the single pile lateral analysis shall be multiplied by 1.2:

(7-40)

The factored maximum shear stress demand τmax, in a circular pile can then be determined:

(7-41)

where:

r = radius of pile

For the seismic load combinations, the maximum allowable shear stress, τcapacity, is the design shear strength, τdesign, from the ANSI/AWC NDS [7.11] multiplied by a factor of 2.8.

(7-42)

The shear capacity must be greater than the maximum demand.

Related Code Sections


3107F.3.3 [SLC] Marine Oil Terminals, Timber Piles
Section 3107F.2.5.2 shall apply to timber piles ...
California Building Code 2016 (Vol 1 & 2) > 31F [SLC] Marine Oil Terminals > 3107F Structural Analysis and Design of Components > 3107F.3 Timber Piles and Deck Components > 3107F.3.3 Timber Piles
1810.4.1.5 Soils and Foundations, Defective Timber Piles
Any substantial sudden increase in rate of penetration of a timber pile shall be investigated for possible damage. If the sudden increase in rate ...
California Building Code 2016 (Vol 1 & 2) > 18 Soils and Foundations > 1810 Deep Foundations > 1810.4 Installation > 1810.4.1 Structural Integrity > 1810.4.1.5 Defective Timber Piles
1810A.4.1.5 Soils and Foundations, Defective Timber Piles
Not permitted by DSA-SS, DSA-SS/CC or OSHPD ...
California Building Code 2016 (Vol 1 & 2) > 18A Soils and Foundations > 1810A Deep Foundations > 1810A.4 Installation > 1810A.4.1 Structural Integrity > 1810A.4.1.5 Defective Timber Piles
3104F.2.3.1.2 [SLC] Marine Oil Terminals, Timber Pile Supported Structures
For all timber pile supported structures, linear elastic procedures may be used. Alternatively, the nonlinear static procedure may be used ...
California Building Code 2016 (Vol 1 & 2) > 31F [SLC] Marine Oil Terminals > 3104F Seismic Analysis and Structural Performance > 3104F.2 Existing MOTs > 3104F.2.3 Analytical Procedures > 3104F.2.3.1 Nonlinear Static Capacity Procedure (Push-Over) > 3104F.2.3.1.2 Timber Pile Supported Structures
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