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T3D2

3D Linear Truss

  • Number of Nodes: 2
  • Number of DoFs: 3 (Translation, Translation, Translation)

Syntax

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element T3D2 (1) (2) (3) (4) (5) [6] [7] [8]
# (1) int, unique element tag
# (2) int, node i
# (3) int, node j
# (4) int, material tag
# (5) double, cross sectional area
# [6] bool string, nonlinear geometry switch, default: false
# [7] bool string, if to update sectional area, default: false
# [8] bool string, if to use log strain, default: false

Remarks

  1. The corotational formulation is implemented, turn on the nonlinear geometry switch to use it.
  2. According to different implementations of details, either a constant area or a constant volume assumption is adopted. If the volume is constant, the cross-sectional area would be updated based on \(A=\dfrac{A_0L_0}{L}\).
  3. The computation of strain can be altered from engineering strain (by default) to log strain.
  4. By turning on all three switches, full nonlinearity can be achieved.