RodYou can choose this option for any section that works in
traction/strain. You then need to specify the section area in the
Section area box.
![](../IconsReference/butix_top_wline.png)
Circular Beam
![](../FemUserImages/beamsection01.gif)
![](../IconsReference/butix_top_wline.png)
Tubular Beam
![](../FemUserImages/beamsection02.gif)
- Ri is the inner radius.
- Ro is the outer radius
![](../IconsReference/butix_top_wline.png)
Rectangular Beam
![](../FemUserImages/beamsection03.gif)
- L is the base.
- H is the height.
![](../IconsReference/butix_top_wline.png)
Thin Box Beam
![](../FemUserImages/beamsection04.gif)
- Li is the inner width.
- Hi is the inner height.
- Le is the outer width.
- He is outer height.
![](../IconsReference/butix_top_wline.png)
Thin U Beam
![](../FemUserImages/beamsection05.gif)
- L is the width.
- H is the height.
- T is the thickness.
![](../IconsReference/butix_top_wline.png)
Thin I Beam
![](../FemUserImages/beamsection06.gif)
- L is the width.
- H is the height.
- Tl is the thickness associated to the width.
- Th is the thickness associated to the height.
![](../IconsReference/butix_top_wline.png)
Thin T Beam
![](../FemUserImages/beamsection07.gif)
- L is the width.
- H is the height.
- Tl is the thickness associated to the width.
- Th is the thickness associated to the height.
![](../IconsReference/butix_top_wline.png)
Thin X Beam
![](../FemUserImages/beamsection08.gif)
- L is the width.
- H is the height.
- Tl is the thickness associated to the width.
- Th is the thickness associated to the height.
![](../IconsReference/butix_top_wline.png)
User-defined BeamThis option works for any type of section. You have to specify the following characteristics:
- S is the section area.
- Ix, Iy, Iz are the three components of the inertia matrix of the beam expressed in the principal axis of the beam (axis in which the matrix is diagonal).
- Ix is the torsion coefficient.
- Iy is the area moment of inertia in the XZ-plane.
- Iz is the area moment of inertia in the XY-plane.
- Shear center Y is the Y-coordinate of the shear center in the section axis, centered
at the center of gravity of the section.
- Shear center Z is the Z-coordinate of the shear center in the section axis, centered
at the center of gravity of the section.
- Shear ratio XY is the ratio between the cross-sectional area (A) and the shear area (Ay),
area section that works in shearing in the XY-plane (case of a
short beam). This ratio should be greater than one.
Shear ratio XY = A / Ay
- Shear ratio XZ is the ratio between the cross-sectional
area (A) and the shear area (Az), area section that works in
shearing in the XZ-plane (case of a short beam). This ratio should be greater than one.
Shear ratio XZ = A / Az
![](../IconsReference/butix_top_wline.png)
Beam from SurfaceThis option works for any type of section. You have to select a surface.
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