B21E

2D Displacement Based Bernoulli Beam With End Moment Release

• Number of Nodes: 2

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

• DoF Label: U1, U2, UR3

Syntax

element B21EL (1) (2) (3) (4) [5] [6]
element B21EH (1) (2) (3) (4) [5] [6]
# (1) int, unique element tag
# (2) int, node i
# (3) int, node j
# (4) int, section tag
# [5] int, number of integration points, default: 6
# [6] bool string, nonlinear geometry switch, default: false

Remarks

1. The Lobatto integration is used by default. The number of integration points ranges from 3 to 20.

2. To use the corotational formulation for nonlinearity, please turn on the switch.

3. To release end moment at node (2), use element B21EL in which L stands for low.

4. To release end moment at node (3), use element B21EH in which H stands for high.

5. Analysts shall ensure the node with moment released must be connected to other elements that has in-plane rotational DoF.

6. Local iterations are performed to achieve a tolerance of 1E-13.

7. Since additional rotation is involved to achieve a pinned connection, visualisation is not available.

8. Unlike 3D beam elements, there is no need to attach an orientation to 2D beam elements.