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    Interface FiberBeamColumn3dTable

    Shared shape for DispBeamColumn3 and ForceBeamColumn3 — both are one prismatic biaxial fiber section (see [FiberTable]) replicated across integration points by core's own element constructors. Unlike [FiberBeamColumn2dTable], there is no corotational field: neither spatial fiber element supports it yet, and no separate transform field — g/j/vec_xz are passed directly to the constructor, since these elements only ever use Linear-type geometry.

    interface FiberBeamColumn3dTable {
        density: number[];
        fiberSection: number[];
        g: number[];
        integration: IntegrationSpec[];
        j: number[];
        nodeI: number[];
        nodeJ: number[];
        vecXz: [number, number, number][];
    }
    Index
    density fiberSection g integration j nodeI nodeJ vecXz
    density: number[]
    fiberSection: number[]

    Index into FiberTable::section_offsets.

    g: number[]
    integration: IntegrationSpec[]
    j: number[]

    Torsional constant — fiber sections don't carry torsion (see [FiberTable]'s doc comment), so it's supplied here as a decoupled elastic G*J term, same as core::DispBeamColumn3/ForceBeamColumn3.

    nodeI: number[]
    nodeJ: number[]
    vecXz: [number, number, number][]

    A vector not parallel to the member axis, fixing the local y/z orientation — see core::GeomTransf3::Linear3's doc comment.

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