# Element types

This topic introduces the different element types available when creating Analysis Elements

# Beam

The **Beam** element type is defined as a 2 node element with 6
potential releases; 3 translational (Fx, Fy, Fz) and 3 rotational (Mx, My, Mz); at
each end.

Material properties and the following section properties are required:

- Ax
- A parallel to minor
- A parallel to minor
- Ix
- I major
- I minor

# Truss

The **Truss** element type is defined as a 2 node element which has
axial (Fx) fixity at each end. The remaining 5 degrees of freedom; 2 translational
(Fy, Fz) and 3 rotational (Mx, My, Mz); are released at each end.

Material properties and the area of the section are required.

This element type acts in both tension and compression.

# Tension only

The **Tension only**
element type is defined as a 2 node element which has axial (Fx) fixity at each end.
The remaining 5 degrees of freedom; 2 translational (Fy, Fz) and 3 rotational (Mx,
My, Mz); are released at each end.

Material properties and the area of the section are required.

This element type acts in tension only.

# Compression only

The **Compression only**
element type is defined as a 2 node element which has axial (Fx) fixity at each end.
The remaining 5 degrees of freedom; 2 translational (Fy, Fz) and 3 rotational (Mx,
My, Mz); are released at each end.

Material properties and the area of the section are required.

This element type acts in compression only.

# Linear axial spring

The **Linear axial
spring** element type is defined as a 2 node element which has axial (Fx) fixity
at each end. The remaining 5 degrees of freedom; 2 translational (Fy, Fz) and 3
rotational (Mx, My, Mz); are released at each end.

An axial **Spring Stiffness**
property is required.

This element type acts in both tension and compression.

# Linear torsional spring

The **Linear torsional
spring** element type is defined as a 2 node element which has torsional (Mx)
fixity at each end. The remaining 5 degrees of freedom; 3 translational (Fx, Fy, Fz)
and 2 rotational (My, Mz); are released at each end.

A rotational **Spring Stiffness**
property is required.

# Non-linear axial spring

The **Non-linear axial
spring** element type is defined as a 2 node element which has axial (Fx) fixity
at each end. The remaining 5 degrees of freedom; 2 translational (Fy, Fz) and 3
rotational (Mx, My, Mz); are released at each end.

Seperate tension and compression
**Spring Stiffness** properties are required and also the maximum tension and
compression values.

# Non-linear torsional spring

The **Linear torsional
spring** element type is defined as a 2 node element which has torsional (Mx)
fixity at each end. The remaining 5 degrees of freedom; 3 translational (Fx, Fy, Fz)
and 2 rotational (My, Mz); are released at each end.

Seperate tension and compression
torsional **Spring Stiffness** properties are required and also the maximum
torsional tension and compression values.

# Link

A basic link element is implemented in Tekla Structural Designer, defined as a 2 node element with 6 springs; 3 translational (Fx, Fy, Fz) and 3 rotational (Mx, My, Mz); at end 2.

This element type is used internally to effect partial fixity in beams.