Struct ZeroLengthSection 

pub struct ZeroLengthSection {
    pub node_i: NodeId,
    pub node_j: NodeId,
    /* private fields */
}

A 2-node, zero-length connector driven by a coupled FiberSection instead of ZeroLength’s independent per-DOF materials — the axial (ux) and flexural (rz) response come out of the same fiber discretization, so axial force and bending moment interact through shared fiber strain, the way a concentrated-plasticity “fiber hinge” needs (e.g. at a beam-column end) and ZeroLength structurally cannot produce. Modeled on OpenSees/Xara’s ZeroLengthSection (SRC/element/Point/ZeroLengthSection.cpp): the section’s basic deformation is the direct nodal DOF difference (no shape functions or integration — there’s no length to integrate over), and K/P are Bᵀ*k_section*B/Bᵀ*q with B selecting [ux, rz], the same pattern DispBeamColumn::form_tangent_and_resistance uses per integration point (here with a single “point” and unit scale).

uy — the one DOF FiberSection has no resultant for — can still carry an independent uniaxial Material spring via with_material, exactly like ZeroLength, additive with (and uncoupled from) the section’s axial-moment response.

Fields

node_i: NodeId

node_j: NodeId

Implementations

impl ZeroLengthSection

pub fn new(node_i: NodeId, node_j: NodeId, section: FiberSection) -> Self

pub fn with_material(self, dof: usize, material: Material) -> Self

Independent spring for a DOF the section doesn’t drive — intended for dof = 1 (uy, shear), since the section already owns ux (dof 0) and rz (dof 2).

pub fn with_orientation( self, orientation: Orientation, ) -> Result<Self, OrientationError>

The section’s axial direction is local x and its flexure is about local z (see Orientation); the default is the global axes.

Trait Implementations

impl Clone for ZeroLengthSection

fn clone(&self) -> ZeroLengthSection

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ZeroLengthSection

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.