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// CODE SNIPPET

3107F.2.2 Component Stiffness

California Building Code 2016 (Vol 1 & 2) > 31F [SLC] Marine Oil Terminals > 3107F Structural Analysis and Design of Components > 3107F.2 Concrete Deck With Concrete or Steel Piles > 3107F.2.2 Component Stiffness
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Stiffness that takes into account the stress and deformation levels experienced by the component shall be used. Nonlinear load-deformation relations shall be used to represent the component load-deformation response. However, in lieu of using nonlinear methods to establish the stiffness and moment curvature relation of structural components, the equations of Table 31F-7-3 may be used to approximate the effective elastic stiffness, EIe, for lateral analyses (see Section 3107F.5 for definition of symbols).

TABLE 31F-7-3
EFFECTIVE ELASTIC STIFFNESS
CONCRETE COMPONENTEIe/EIg
Reinforced Pile0.3 + N/(f'cAg)
Pile/Deck Dowel Connection10.3 + N/(f'cAg)
Prestressed Pile10.6 < EIe/EIg < 0.75
Steel Pile1.0
Concrete w/Steel Casing
Deck0.5
  1. The pile/deck connection and prestressed pile may also be approximated as one member with an average stiffness of 0.42 EIe/EIg (Ferritto et al, 1999 [7.2])
    N = is the axial load level.
    Es = Young's modulus for steel
    Is = Moment of inertia for steel section
    Ec = Young's modulus for concrete
    Ic = Moment of inertia for uncracked concrete section

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