Define General Spring Type
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Define the values of General Nodal Spring Stiffness. |
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From the Main Menu select Model > Boundaries > Define General Spring Type. |
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General Spring Type dialog box
Name
Coupled
Spring Stiffness
SDx-SDx
SDx-SDy
SRz-SRz
Note In typical building structures, analysis models do not include the pile footings. Instead, boundary springs are assumed to exist at the bottom of foundation or at the pile caps. The following general stiffness offers true stiffness of pile elements. For batter piles, use Node's local Axis to calculate the stiffness in the skewed directions.
Composition of general spring stiffness
* Assumptions
Modulus of elasticity: E
Section's moments of inertia: Iy, Iz
Cross sectional area: A
Length: L
(Shear deformation not considered)
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