SingleSection

Single Section Analysis

• 2D:

  • Number of DoFs: 2 (AXIAL, STRONG AXIS ROTATION)

  • DoF Label: AXIAL, RS

• 3D:

  • Number of DoFs: 3 (AXIAL, STRONG AXIS ROTATION, WEAK AXIS ROTATION)

  • DoF Label: AXIAL, RS, RW

It is often demanded to do a section analysis to see the capacity of the target section, etc. The SingleSection element is exactly for this purpose.

To use the element, a proper section shall be defined.

Syntax

element SingleSection2D (1) (2) (3)
element SingleSection3D (1) (2) (3)
# (1) int, unique tag
# (2) int, node tag
# (3) int, section tag

Remarks

It directly exposes the associated section.

!!! warning "breaking changes" Before v4, one can use integer indices (1, 2 and 3 in 3D cases) to apply a load or constrain a DoF. Starting from v4, one must use AXIAL, RS and RW to achieve the same purpose.

```text
node 1 0 0
material Bilinear1D 1 10 .8 .02
section Rectangle2D 1 12 1 1
element SingleSection2D 1 1 1

// use rs to apply a concentrated load of magnitude 3 to the strong axis bending DoF of node 1
cload 1 0 3 rs 1
```