2.1 Truss Elements

2.1.1 Truss 1D element

Represents linear isoparametric truss element in 1D. The elements are assumed to be located along the x-axis. Requires cross section area to be specified. The element features are summarized in Table 1.




Keyword

truss1d

Description

1D truss element

Specific parameters

-



Unknowns

Single dof (u-displacement) is required in each node

Approximation

Linear approximation of displacement and geometry

Integration

Exact

Features

Full dynamic analysis support, Full nonlocal constitutive support, Adaptivity support

CS properties

Area is required

Loads

Body loads are supported. Boundary loads are not supported in current implementation

Status

Reliable




Table 1: truss1d element summary

2.1.2 Truss 2D element

Two node linear isoparametric truss element for 2D analysis. The element geometry can be specified in (x,z), (x,y), or (y,z) plane. The element features are summarized in Table 2.


PIC

Figure 1: Truss2d element in (x,z) plane.





Keyword

truss2d

Description

2D truss element

Specific parameters

[cs #(in)]



Parameters

cs: this parameter can be used to change default definition plane. The supported values of cs are following: 0 for (x,z) plane (default), 1 for (x,y) plane, and 3 for (y,z) plane.

Unknowns

Two dofs representing displacements in definition plane are required in each node. The element can be used in different planes, default definition plane is (x,z). The parameter cs can be used to change default definition plane.

Approximation

Linear approximation of displacements and geometry.

Integration

Exact.

Features

Full dynamic analysis support. Full nonlocal constitutive support.

CS properties

cross section area should be provided.

Loads

Edge loads are supported, Edge number should be equal to 1

Status

Reliable




Table 2: truss2d element summary

truss2d element summarytruss2dsummary

2.1.3 Truss 3D element

Two node linear isoparametric truss element for 3D analysis. The element geometry is specified in (x,y,z) plane. The element features are summarized in Table 3.




Keyword

truss3d

Description

3D truss element

Specific parameters

-



Unknowns

Three displacement DOFs (in x, y, and z directions) are required in each node.

Approximation

Linear approximation of displacements and geometry.

Integration

Exact.

Features

Full dynamic analysis support. Full nonlocal constitutive support.

CS properties

cross section area should be provided.

Status

Reliable




Table 3: truss3d element summary