T3D2

3D Linear Truss

• Number of Nodes: 2

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

• DoF Label: U1, U2, U3

Syntax

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.